Use modern HttpClient

(cherry picked from commit 402f8b296f17bf161824ec5ff40d67d036d00d94)

src/NzbDrone.Common.Test/Http/HttpClientFixture.cs

@@ -17,6 +17,7 @@ using NzbDrone.Common.Http.Proxy;
 using NzbDrone.Common.TPL;
 using NzbDrone.Test.Common;
 using NzbDrone.Test.Common.Categories;
+using HttpClient = NzbDrone.Common.Http.HttpClient;
 
 namespace NzbDrone.Common.Test.Http
 {
@@ -31,6 +32,8 @@ namespace NzbDrone.Common.Test.Http
         private string _httpBinHost;
         private string _httpBinHost2;
 
+        private System.Net.Http.HttpClient _httpClient = new ();
+
         [OneTimeSetUp]
         public void FixtureSetUp()
         {
@@ -53,22 +56,13 @@ namespace NzbDrone.Common.Test.Http
         {
             try
             {
-                var req = WebRequest.Create($"https://{site}/get") as HttpWebRequest;
+                var res = _httpClient.GetAsync($"https://{site}/get").GetAwaiter().GetResult();
-                var res = req.GetResponse() as HttpWebResponse;
                 if (res.StatusCode != HttpStatusCode.OK)
                 {
                     return false;
                 }
 
-                try
+                res = _httpClient.GetAsync($"https://{site}/status/429").GetAwaiter().GetResult();
-                {
-                    req = WebRequest.Create($"https://{site}/status/429") as HttpWebRequest;
-                    res = req.GetResponse() as HttpWebResponse;
-                }
-                catch (WebException ex)
-                {
-                    res = ex.Response as HttpWebResponse;
-                }
 
                 if (res == null || res.StatusCode != (HttpStatusCode)429)
                 {
@@ -165,7 +159,9 @@ namespace NzbDrone.Common.Test.Http
             var response = Subject.Get<HttpBinResource>(request);
 
             response.Resource.Headers["Accept-Encoding"].ToString().Should().Contain("gzip");
+
             response.Resource.Gzipped.Should().BeTrue();
+            response.Resource.Brotli.Should().BeFalse();
         }
 
         [Test]
@@ -176,6 +172,8 @@ namespace NzbDrone.Common.Test.Http
             var response = Subject.Get<HttpBinResource>(request);
 
             response.Resource.Headers["Accept-Encoding"].ToString().Should().Contain("br");
+
+            response.Resource.Gzipped.Should().BeFalse();
             response.Resource.Brotli.Should().BeTrue();
         }
 
@@ -358,13 +356,38 @@ namespace NzbDrone.Common.Test.Http
         {
             var file = GetTempFilePath();
 
-            Assert.Throws<WebException>(() => Subject.DownloadFile("https://download.readarr.com/wrongpath", file));
+            Assert.Throws<HttpException>(() => Subject.DownloadFile("https://download.sonarr.tv/wrongpath", file));
 
             File.Exists(file).Should().BeFalse();
 
             ExceptionVerification.ExpectedWarns(1);
         }
 
+        [Test]
+        public void should_not_write_redirect_content_to_stream()
+        {
+            var file = GetTempFilePath();
+
+            using (var fileStream = new FileStream(file, FileMode.Create))
+            {
+                var request = new HttpRequest($"http://{_httpBinHost}/redirect/1");
+                request.AllowAutoRedirect = false;
+                request.ResponseStream = fileStream;
+
+                var response = Subject.Get(request);
+
+                response.StatusCode.Should().Be(HttpStatusCode.Moved);
+            }
+
+            ExceptionVerification.ExpectedErrors(1);
+
+            File.Exists(file).Should().BeTrue();
+
+            var fileInfo = new FileInfo(file);
+
+            fileInfo.Length.Should().Be(0);
+        }
+
         [Test]
         public void should_send_cookie()
         {
@@ -784,6 +807,28 @@ namespace NzbDrone.Common.Test.Http
             {
             }
         }
+
+        [Test]
+        public void should_correctly_use_basic_auth()
+        {
+            var request = new HttpRequest($"https://{_httpBinHost}/basic-auth/username/password");
+            request.Credentials = new BasicNetworkCredential("username", "password");
+
+            var response = Subject.Execute(request);
+
+            response.StatusCode.Should().Be(HttpStatusCode.OK);
+        }
+
+        [Test]
+        public void should_correctly_use_digest_auth()
+        {
+            var request = new HttpRequest($"https://{_httpBinHost}/digest-auth/auth/username/password");
+            request.Credentials = new NetworkCredential("username", "password");
+
+            var response = Subject.Execute(request);
+
+            response.StatusCode.Should().Be(HttpStatusCode.OK);
+        }
     }
 
     public class HttpBinResource

src/NzbDrone.Common/Http/Dispatchers/IHttpDispatcher.cs

@@ -5,6 +5,5 @@ namespace NzbDrone.Common.Http.Dispatchers
     public interface IHttpDispatcher
     {
         HttpResponse GetResponse(HttpRequest request, CookieContainer cookies);
-        void DownloadFile(string url, string fileName);
     }
 }

src/NzbDrone.Common/Http/Dispatchers/ManagedHttpDispatcher.cs

@@ -1,10 +1,12 @@
 using System;
-using System.Diagnostics;
 using System.IO;
 using System.Net;
+using System.Net.Http;
+using System.Net.Http.Headers;
 using System.Text;
+using System.Threading;
 using NLog;
-using NzbDrone.Common.EnvironmentInfo;
+using NzbDrone.Common.Cache;
 using NzbDrone.Common.Extensions;
 using NzbDrone.Common.Http.Proxy;
 
@@ -12,120 +14,113 @@ namespace NzbDrone.Common.Http.Dispatchers
 {
     public class ManagedHttpDispatcher : IHttpDispatcher
     {
+        private const string NO_PROXY_KEY = "no-proxy";
+
         private readonly IHttpProxySettingsProvider _proxySettingsProvider;
         private readonly ICreateManagedWebProxy _createManagedWebProxy;
         private readonly IUserAgentBuilder _userAgentBuilder;
-        private readonly IPlatformInfo _platformInfo;
+        private readonly ICached<System.Net.Http.HttpClient> _httpClientCache;
+        private readonly ICached<CredentialCache> _credentialCache;
         private readonly Logger _logger;
 
-        public ManagedHttpDispatcher(IHttpProxySettingsProvider proxySettingsProvider, ICreateManagedWebProxy createManagedWebProxy, IUserAgentBuilder userAgentBuilder, IPlatformInfo platformInfo, Logger logger)
+        public ManagedHttpDispatcher(IHttpProxySettingsProvider proxySettingsProvider,
+            ICreateManagedWebProxy createManagedWebProxy,
+            IUserAgentBuilder userAgentBuilder,
+            ICacheManager cacheManager,
+            Logger logger)
         {
             _proxySettingsProvider = proxySettingsProvider;
             _createManagedWebProxy = createManagedWebProxy;
             _userAgentBuilder = userAgentBuilder;
-            _platformInfo = platformInfo;
             _logger = logger;
+
+            _httpClientCache = cacheManager.GetCache<System.Net.Http.HttpClient>(typeof(ManagedHttpDispatcher), "httpclient");
+            _credentialCache = cacheManager.GetCache<CredentialCache>(typeof(ManagedHttpDispatcher), "credentialcache");
         }
 
         public HttpResponse GetResponse(HttpRequest request, CookieContainer cookies)
         {
-            var webRequest = (HttpWebRequest)WebRequest.Create((Uri)request.Url);
+            var requestMessage = new HttpRequestMessage(request.Method, (Uri)request.Url);
-
+            requestMessage.Headers.UserAgent.ParseAdd(_userAgentBuilder.GetUserAgent(request.UseSimplifiedUserAgent));
-            // Deflate is not a standard and could break depending on implementation.
+            requestMessage.Headers.ConnectionClose = !request.ConnectionKeepAlive;
-            // we should just stick with the more compatible Gzip
-            //http://stackoverflow.com/questions/8490718/how-to-decompress-stream-deflated-with-java-util-zip-deflater-in-net
-            webRequest.AutomaticDecompression = DecompressionMethods.Brotli | DecompressionMethods.GZip;
 
-            webRequest.Method = request.Method.ToString();
+            var cookieHeader = cookies.GetCookieHeader((Uri)request.Url);
-            webRequest.UserAgent = _userAgentBuilder.GetUserAgent(request.UseSimplifiedUserAgent);
+            if (cookieHeader.IsNotNullOrWhiteSpace())
-            webRequest.KeepAlive = request.ConnectionKeepAlive;
+            {
-            webRequest.AllowAutoRedirect = false;
+                requestMessage.Headers.Add("Cookie", cookieHeader);
-            webRequest.CookieContainer = cookies;
+            }
 
             if (request.Credentials != null)
             {
-                if (request.Credentials is BasicNetworkCredential nc)
+                if (request.Credentials is BasicNetworkCredential bc)
                 {
                     // Manually set header to avoid initial challenge response
-                    var authInfo = nc.UserName + ":" + nc.Password;
+                    var authInfo = bc.UserName + ":" + bc.Password;
                     authInfo = Convert.ToBase64String(Encoding.GetEncoding("ISO-8859-1").GetBytes(authInfo));
-                    webRequest.Headers.Add("Authorization", "Basic " + authInfo);
+                    requestMessage.Headers.Authorization = new AuthenticationHeaderValue("Basic", authInfo);
                 }
-                else
+                else if (request.Credentials is NetworkCredential nc)
                 {
-                    webRequest.PreAuthenticate = true;
+                    var creds = GetCredentialCache();
-                    webRequest.Credentials = request.Credentials;
+                    creds.Remove((Uri)request.Url, "Digest");
+                    creds.Add((Uri)request.Url, "Digest", nc);
                 }
             }
 
+            using var cts = new CancellationTokenSource();
             if (request.RequestTimeout != TimeSpan.Zero)
             {
-                webRequest.Timeout = (int)Math.Ceiling(request.RequestTimeout.TotalMilliseconds);
+                cts.CancelAfter(request.RequestTimeout);
+            }
+            else
+            {
+                // The default for System.Net.Http.HttpClient
+                cts.CancelAfter(TimeSpan.FromSeconds(100));
             }
-
-            webRequest.Proxy = GetProxy(request.Url);
 
             if (request.Headers != null)
             {
-                AddRequestHeaders(webRequest, request.Headers);
+                AddRequestHeaders(requestMessage, request.Headers);
             }
 
-            HttpWebResponse httpWebResponse;
+            var httpClient = GetClient(request.Url);
+
+            HttpResponseMessage responseMessage;
 
             try
             {
                 if (request.ContentData != null)
                 {
-                    webRequest.ContentLength = request.ContentData.Length;
+                    var content = new ByteArrayContent(request.ContentData);
-                    using (var writeStream = webRequest.GetRequestStream())
+                    content.Headers.Remove("Content-Type");
+                    if (request.Headers.ContentType.IsNotNullOrWhiteSpace())
                     {
-                        writeStream.Write(request.ContentData, 0, request.ContentData.Length);
+                        content.Headers.Add("Content-Type", request.Headers.ContentType);
                     }
+
+                    requestMessage.Content = content;
                 }
 
-                httpWebResponse = (HttpWebResponse)webRequest.GetResponse();
+                responseMessage = httpClient.Send(requestMessage, cts.Token);
             }
-            catch (WebException e)
+            catch (HttpRequestException e)
             {
-                httpWebResponse = (HttpWebResponse)e.Response;
+                _logger.Error(e, "HttpClient error");
-
+                throw;
-                if (httpWebResponse == null)
-                {
-                    // The default messages for WebException on mono are pretty horrible.
-                    if (e.Status == WebExceptionStatus.NameResolutionFailure)
-                    {
-                        throw new WebException($"DNS Name Resolution Failure: '{webRequest.RequestUri.Host}'", e.Status);
-                    }
-                    else if (e.ToString().Contains("TLS Support not"))
-                    {
-                        throw new TlsFailureException(webRequest, e);
-                    }
-                    else if (e.ToString().Contains("The authentication or decryption has failed."))
-                    {
-                        throw new TlsFailureException(webRequest, e);
-                    }
-                    else if (OsInfo.IsNotWindows)
-                    {
-                        throw new WebException($"{e.Message}: '{webRequest.RequestUri}'", e, e.Status, e.Response);
-                    }
-                    else
-                    {
-                        throw;
-                    }
-                }
             }
 
             byte[] data = null;
 
-            using (var responseStream = httpWebResponse.GetResponseStream())
+            using (var responseStream = responseMessage.Content.ReadAsStream())
             {
                 if (responseStream != null && responseStream != Stream.Null)
                 {
                     try
                     {
-                        if (request.ResponseStream != null)
+                        if (request.ResponseStream != null && responseMessage.StatusCode == HttpStatusCode.OK)
                         {
                             // A target ResponseStream was specified, write to that instead.
+                            // But only on the OK status code, since we don't want to write failures and redirects.
                             responseStream.CopyTo(request.ResponseStream);
                         }
                         else
@@ -135,102 +130,88 @@ namespace NzbDrone.Common.Http.Dispatchers
                     }
                     catch (Exception ex)
                     {
-                        throw new WebException("Failed to read complete http response", ex, WebExceptionStatus.ReceiveFailure, httpWebResponse);
+                        throw new WebException("Failed to read complete http response", ex, WebExceptionStatus.ReceiveFailure, null);
                     }
                 }
             }
 
-            return new HttpResponse(request, new HttpHeader(httpWebResponse.Headers), data, httpWebResponse.StatusCode);
+            return new HttpResponse(request, new HttpHeader(responseMessage.Headers), data, responseMessage.StatusCode);
         }
 
-        public void DownloadFile(string url, string fileName)
+        protected virtual System.Net.Http.HttpClient GetClient(HttpUri uri)
         {
-            try
+            var proxySettings = _proxySettingsProvider.GetProxySettings(uri);
-            {
-                var fileInfo = new FileInfo(fileName);
-                if (fileInfo.Directory != null && !fileInfo.Directory.Exists)
-                {
-                    fileInfo.Directory.Create();
-                }
-
-                _logger.Debug("Downloading [{0}] to [{1}]", url, fileName);
 
-                var stopWatch = Stopwatch.StartNew();
+            var key = proxySettings?.Key ?? NO_PROXY_KEY;
-                var uri = new HttpUri(url);
 
-                using (var webClient = new GZipWebClient())
+            return _httpClientCache.Get(key, () => CreateHttpClient(proxySettings));
-                {
-                    webClient.Headers.Add(HttpRequestHeader.UserAgent, _userAgentBuilder.GetUserAgent());
-                    webClient.Proxy = GetProxy(uri);
-                    webClient.DownloadFile(uri.FullUri, fileName);
-                    stopWatch.Stop();
-                    _logger.Debug("Downloading Completed. took {0:0}s", stopWatch.Elapsed.Seconds);
-                }
-            }
-            catch (WebException e)
-            {
-                _logger.Warn("Failed to get response from: {0} {1}", url, e.Message);
-                throw;
-            }
-            catch (Exception e)
-            {
-                _logger.Warn(e, "Failed to get response from: " + url);
-                throw;
-            }
         }
 
-        protected virtual IWebProxy GetProxy(HttpUri uri)
+        protected virtual System.Net.Http.HttpClient CreateHttpClient(HttpProxySettings proxySettings)
         {
-            IWebProxy proxy = null;
+            var handler = new HttpClientHandler()
-
+            {
-            var proxySettings = _proxySettingsProvider.GetProxySettings(uri);
+                AutomaticDecompression = DecompressionMethods.GZip | DecompressionMethods.Brotli,
+                UseCookies = false, // sic - we don't want to use a shared cookie container
+                AllowAutoRedirect = false,
+                Credentials = GetCredentialCache(),
+                PreAuthenticate = true
+            };
 
             if (proxySettings != null)
             {
-                proxy = _createManagedWebProxy.GetWebProxy(proxySettings);
+                handler.Proxy = _createManagedWebProxy.GetWebProxy(proxySettings);
             }
 
-            return proxy;
+            var client = new System.Net.Http.HttpClient(handler)
+            {
+                Timeout = Timeout.InfiniteTimeSpan
+            };
+
+            return client;
         }
 
-        protected virtual void AddRequestHeaders(HttpWebRequest webRequest, HttpHeader headers)
+        protected virtual void AddRequestHeaders(HttpRequestMessage webRequest, HttpHeader headers)
         {
             foreach (var header in headers)
             {
                 switch (header.Key)
                 {
                     case "Accept":
-                        webRequest.Accept = header.Value;
+                        webRequest.Headers.Accept.ParseAdd(header.Value);
                         break;
                     case "Connection":
-                        webRequest.Connection = header.Value;
+                        webRequest.Headers.Connection.Clear();
+                        webRequest.Headers.Connection.Add(header.Value);
                         break;
                     case "Content-Length":
-                        webRequest.ContentLength = Convert.ToInt64(header.Value);
+                        webRequest.Headers.Add("Content-Length", header.Value);
                         break;
                     case "Content-Type":
-                        webRequest.ContentType = header.Value;
+                        webRequest.Headers.Remove("Content-Type");
+                        webRequest.Headers.Add("Content-Type", header.Value);
                         break;
                     case "Date":
-                        webRequest.Date = HttpHeader.ParseDateTime(header.Value);
+                        webRequest.Headers.Remove("Date");
+                        webRequest.Headers.Date = HttpHeader.ParseDateTime(header.Value);
                         break;
                     case "Expect":
-                        webRequest.Expect = header.Value;
+                        webRequest.Headers.Expect.ParseAdd(header.Value);
                         break;
                     case "Host":
-                        webRequest.Host = header.Value;
+                        webRequest.Headers.Host = header.Value;
                         break;
                     case "If-Modified-Since":
-                        webRequest.IfModifiedSince = HttpHeader.ParseDateTime(header.Value);
+                        webRequest.Headers.IfModifiedSince = HttpHeader.ParseDateTime(header.Value);
                         break;
                     case "Referer":
-                        webRequest.Referer = header.Value;
+                        webRequest.Headers.Add("Referer", header.Value);
                         break;
                     case "Transfer-Encoding":
-                        webRequest.TransferEncoding = header.Value;
+                        webRequest.Headers.TransferEncoding.ParseAdd(header.Value);
                         break;
                     case "User-Agent":
-                        webRequest.UserAgent = header.Value;
+                        webRequest.Headers.UserAgent.ParseAdd(header.Value);
                         break;
                     case "Proxy-Connection":
                         throw new NotImplementedException();
@@ -240,5 +221,10 @@ namespace NzbDrone.Common.Http.Dispatchers
                 }
             }
         }
+
+        private CredentialCache GetCredentialCache()
+        {
+            return _credentialCache.Get("credentialCache", () => new CredentialCache());
+        }
     }
 }

src/NzbDrone.Common/Http/GZipWebClient.cs

@@ -1,15 +0,0 @@
-using System;
-using System.Net;
-
-namespace NzbDrone.Common.Http
-{
-    public class GZipWebClient : WebClient
-    {
-        protected override WebRequest GetWebRequest(Uri address)
-        {
-            var request = (HttpWebRequest)base.GetWebRequest(address);
-            request.AutomaticDecompression = DecompressionMethods.GZip;
-            return request;
-        }
-    }
-}

src/NzbDrone.Common/Http/HttpClient.cs

@@ -1,8 +1,10 @@
-using System;
+using System;
 using System.Collections.Generic;
 using System.Diagnostics;
+using System.IO;
 using System.Linq;
 using System.Net;
+using System.Net.Http;
 using NLog;
 using NzbDrone.Common.Cache;
 using NzbDrone.Common.EnvironmentInfo;
@@ -119,8 +121,6 @@ namespace NzbDrone.Common.Http
 
             var stopWatch = Stopwatch.StartNew();
 
-            PrepareRequestCookies(request, cookieContainer);
-
             var response = _httpDispatcher.GetResponse(request, cookieContainer);
 
             HandleResponseCookies(response, cookieContainer);
@@ -187,57 +187,98 @@ namespace NzbDrone.Common.Http
             }
         }
 
-        private void PrepareRequestCookies(HttpRequest request, CookieContainer cookieContainer)
+        private void HandleResponseCookies(HttpResponse response, CookieContainer container)
         {
-            // Don't collect persistnet cookies for intermediate/redirected urls.
+            foreach (Cookie cookie in container.GetCookies((Uri)response.Request.Url))
-            /*lock (_cookieContainerCache)
             {
-                var presistentContainer = _cookieContainerCache.Get("container", () => new CookieContainer());
+                cookie.Expired = true;
-                var persistentCookies = presistentContainer.GetCookies((Uri)request.Url);
+            }
-                var existingCookies = cookieContainer.GetCookies((Uri)request.Url);
-
-                cookieContainer.Add(persistentCookies);
-                cookieContainer.Add(existingCookies);
-            }*/
-        }
 
-        private void HandleResponseCookies(HttpResponse response, CookieContainer cookieContainer)
-        {
             var cookieHeaders = response.GetCookieHeaders();
+
             if (cookieHeaders.Empty())
             {
                 return;
             }
 
+            AddCookiesToContainer(response.Request.Url, cookieHeaders, container);
+
             if (response.Request.StoreResponseCookie)
             {
                 lock (_cookieContainerCache)
                 {
                     var persistentCookieContainer = _cookieContainerCache.Get("container", () => new CookieContainer());
 
-                    foreach (var cookieHeader in cookieHeaders)
+                    AddCookiesToContainer(response.Request.Url, cookieHeaders, persistentCookieContainer);
-                    {
+                }
-                        try
+            }
-                        {
+        }
-                            persistentCookieContainer.SetCookies((Uri)response.Request.Url, cookieHeader);
+
-                        }
+        private void AddCookiesToContainer(HttpUri url, string[] cookieHeaders, CookieContainer container)
-                        catch (Exception ex)
+        {
-                        {
+            foreach (var cookieHeader in cookieHeaders)
-                            _logger.Debug(ex, "Invalid cookie in {0}", response.Request.Url);
+            {
-                        }
+                try
-                    }
+                {
+                    container.SetCookies((Uri)url, cookieHeader);
+                }
+                catch (Exception ex)
+                {
+                    _logger.Debug(ex, "Invalid cookie in {0}", url);
                 }
             }
         }
 
         public void DownloadFile(string url, string fileName, string userAgent = null)
         {
-            _httpDispatcher.DownloadFile(url, fileName);
+            var fileNamePart = fileName + ".part";
+
+            try
+            {
+                var fileInfo = new FileInfo(fileName);
+                if (fileInfo.Directory != null && !fileInfo.Directory.Exists)
+                {
+                    fileInfo.Directory.Create();
+                }
+
+                _logger.Debug("Downloading [{0}] to [{1}]", url, fileName);
+
+                var stopWatch = Stopwatch.StartNew();
+                using (var fileStream = new FileStream(fileNamePart, FileMode.Create, FileAccess.ReadWrite))
+                {
+                    var request = new HttpRequest(url);
+                    request.AllowAutoRedirect = true;
+                    request.ResponseStream = fileStream;
+                    var response = Get(request);
+
+                    if (response.Headers.ContentType != null && response.Headers.ContentType.Contains("text/html"))
+                    {
+                        throw new HttpException(request, response, "Site responded with html content.");
+                    }
+                }
+
+                stopWatch.Stop();
+
+                if (File.Exists(fileName))
+                {
+                    File.Delete(fileName);
+                }
+
+                File.Move(fileNamePart, fileName);
+                _logger.Debug("Downloading Completed. took {0:0}s", stopWatch.Elapsed.Seconds);
+            }
+            finally
+            {
+                if (File.Exists(fileNamePart))
+                {
+                    File.Delete(fileNamePart);
+                }
+            }
         }
 
         public HttpResponse Get(HttpRequest request)
         {
-            request.Method = HttpMethod.GET;
+            request.Method = HttpMethod.Get;
             return Execute(request);
         }
 
@@ -251,13 +292,13 @@ namespace NzbDrone.Common.Http
 
         public HttpResponse Head(HttpRequest request)
         {
-            request.Method = HttpMethod.HEAD;
+            request.Method = HttpMethod.Head;
             return Execute(request);
         }
 
         public HttpResponse Post(HttpRequest request)
         {
-            request.Method = HttpMethod.POST;
+            request.Method = HttpMethod.Post;
             return Execute(request);
         }
 

src/NzbDrone.Common/Http/HttpHeader.cs

@@ -4,11 +4,27 @@ using System.Collections.Generic;
 using System.Collections.Specialized;
 using System.Globalization;
 using System.Linq;
+using System.Net;
+using System.Net.Http.Headers;
 using System.Text;
 using NzbDrone.Common.Extensions;
 
 namespace NzbDrone.Common.Http
 {
+    public static class WebHeaderCollectionExtensions
+    {
+        public static NameValueCollection ToNameValueCollection(this HttpHeaders headers)
+        {
+            var result = new NameValueCollection();
+            foreach (var header in headers)
+            {
+                result.Add(header.Key, header.Value.ConcatToString(";"));
+            }
+
+            return result;
+        }
+    }
+
     public class HttpHeader : NameValueCollection, IEnumerable<KeyValuePair<string, string>>, IEnumerable
     {
         public HttpHeader(NameValueCollection headers)
@@ -16,6 +32,11 @@ namespace NzbDrone.Common.Http
         {
         }
 
+        public HttpHeader(HttpHeaders headers)
+            : base(headers.ToNameValueCollection())
+        {
+        }
+
         public HttpHeader()
         {
         }

src/NzbDrone.Common/Http/HttpMethod.cs

@@ -1,14 +0,0 @@
-namespace NzbDrone.Common.Http
-{
-    public enum HttpMethod
-    {
-        GET,
-        POST,
-        PUT,
-        DELETE,
-        HEAD,
-        OPTIONS,
-        PATCH,
-        MERGE
-    }
-}

src/NzbDrone.Common/Http/HttpRequest.cs

@@ -2,6 +2,7 @@ using System;
 using System.Collections.Generic;
 using System.IO;
 using System.Net;
+using System.Net.Http;
 using System.Text;
 using NzbDrone.Common.EnvironmentInfo;
 using NzbDrone.Common.Extensions;
@@ -12,6 +13,7 @@ namespace NzbDrone.Common.Http
     {
         public HttpRequest(string url, HttpAccept httpAccept = null)
         {
+            Method = HttpMethod.Get;
             Url = new HttpUri(url);
             Headers = new HttpHeader();
             AllowAutoRedirect = true;

src/NzbDrone.Common/Http/HttpRequestBuilder.cs

@@ -3,6 +3,7 @@ using System.Collections.Generic;
 using System.IO;
 using System.Linq;
 using System.Net;
+using System.Net.Http;
 using System.Text;
 using NzbDrone.Common.Extensions;
 
@@ -34,7 +35,7 @@ namespace NzbDrone.Common.Http
         {
             BaseUrl = new HttpUri(baseUrl);
             ResourceUrl = string.Empty;
-            Method = HttpMethod.GET;
+            Method = HttpMethod.Get;
             QueryParams = new List<KeyValuePair<string, string>>();
             SuffixQueryParams = new List<KeyValuePair<string, string>>();
             Segments = new Dictionary<string, string>();
@@ -264,7 +265,7 @@ namespace NzbDrone.Common.Http
 
         public virtual HttpRequestBuilder Post()
         {
-            Method = HttpMethod.POST;
+            Method = HttpMethod.Post;
 
             return this;
         }
@@ -355,7 +356,7 @@ namespace NzbDrone.Common.Http
 
         public virtual HttpRequestBuilder AddFormParameter(string key, object value)
         {
-            if (Method != HttpMethod.POST)
+            if (Method != HttpMethod.Post)
             {
                 throw new NotSupportedException("HttpRequest Method must be POST to add FormParameter.");
             }
@@ -371,7 +372,7 @@ namespace NzbDrone.Common.Http
 
         public virtual HttpRequestBuilder AddFormUpload(string name, string fileName, byte[] data, string contentType = "application/octet-stream")
         {
-            if (Method != HttpMethod.POST)
+            if (Method != HttpMethod.Post)
             {
                 throw new NotSupportedException("HttpRequest Method must be POST to add FormUpload.");
             }

src/NzbDrone.Common/Http/JsonRpcRequestBuilder.cs

@@ -1,6 +1,7 @@
-using System;
+using System;
 using System.Collections.Generic;
 using System.Linq;
+using System.Net.Http;
 using Newtonsoft.Json;
 using NzbDrone.Common.Serializer;
 
@@ -17,14 +18,14 @@ namespace NzbDrone.Common.Http
         public JsonRpcRequestBuilder(string baseUrl)
             : base(baseUrl)
         {
-            Method = HttpMethod.POST;
+            Method = HttpMethod.Post;
             JsonParameters = new List<object>();
         }
 
         public JsonRpcRequestBuilder(string baseUrl, string method, IEnumerable<object> parameters)
             : base(baseUrl)
         {
-            Method = HttpMethod.POST;
+            Method = HttpMethod.Post;
             JsonMethod = method;
             JsonParameters = parameters.ToList();
         }

src/NzbDrone.Core.Test/Framework/CoreTest.cs

@@ -25,7 +25,7 @@ namespace NzbDrone.Core.Test.Framework
 
             Mocker.SetConstant<IHttpProxySettingsProvider>(new HttpProxySettingsProvider(Mocker.Resolve<ConfigService>()));
             Mocker.SetConstant<ICreateManagedWebProxy>(new ManagedWebProxyFactory(Mocker.Resolve<CacheManager>()));
-            Mocker.SetConstant<IHttpDispatcher>(new ManagedHttpDispatcher(Mocker.Resolve<IHttpProxySettingsProvider>(), Mocker.Resolve<ICreateManagedWebProxy>(), Mocker.Resolve<UserAgentBuilder>(), Mocker.Resolve<IPlatformInfo>(), TestLogger));
+            Mocker.SetConstant<IHttpDispatcher>(new ManagedHttpDispatcher(Mocker.Resolve<IHttpProxySettingsProvider>(), Mocker.Resolve<ICreateManagedWebProxy>(), Mocker.Resolve<UserAgentBuilder>(), Mocker.Resolve<CacheManager>(), TestLogger));
             Mocker.SetConstant<IHttpClient>(new HttpClient(new IHttpRequestInterceptor[0], Mocker.Resolve<CacheManager>(), Mocker.Resolve<RateLimitService>(), Mocker.Resolve<IHttpDispatcher>(), TestLogger));
             Mocker.SetConstant<IReadarrCloudRequestBuilder>(new ReadarrCloudRequestBuilder());
             Mocker.SetConstant<IMetadataRequestBuilder>(Mocker.Resolve<MetadataRequestBuilder>());

src/NzbDrone.Core.Test/IndexerTests/FileListTests/FileListFixture.cs

@@ -1,5 +1,6 @@
 using System;
 using System.Linq;
+using System.Net.Http;
 using FluentAssertions;
 using Moq;
 using NUnit.Framework;
@@ -30,7 +31,7 @@ namespace NzbDrone.Core.Test.IndexerTests.FileListTests
             var recentFeed = ReadAllText(@"Files/Indexers/FileList/RecentFeed.json");
 
             Mocker.GetMock<IHttpClient>()
-                .Setup(o => o.Execute(It.Is<HttpRequest>(v => v.Method == HttpMethod.GET)))
+                .Setup(o => o.Execute(It.Is<HttpRequest>(v => v.Method == HttpMethod.Get)))
                 .Returns<HttpRequest>(r => new HttpResponse(r, new HttpHeader(), recentFeed));
 
             var releases = Subject.FetchRecent();

src/NzbDrone.Core.Test/IndexerTests/GazelleTests/GazelleFixture.cs

@@ -1,5 +1,6 @@
 using System;
 using System.Linq;
+using System.Net.Http;
 using FluentAssertions;
 using Moq;
 using NUnit.Framework;
@@ -35,15 +36,15 @@ namespace NzbDrone.Core.Test.IndexerTests.GazelleTests
             var indexFeed = ReadAllText(@"Files/Indexers/Gazelle/GazelleIndex.json");
 
             Mocker.GetMock<IHttpClient>()
-                .Setup(o => o.Execute(It.Is<HttpRequest>(v => v.Method == HttpMethod.GET && v.Url.FullUri.Contains("ajax.php?action=browse"))))
+                .Setup(o => o.Execute(It.Is<HttpRequest>(v => v.Method == HttpMethod.Get && v.Url.FullUri.Contains("ajax.php?action=browse"))))
                 .Returns<HttpRequest>(r => new HttpResponse(r, new HttpHeader { ContentType = "application/json" }, recentFeed));
 
             Mocker.GetMock<IHttpClient>()
-                .Setup(o => o.Execute(It.Is<HttpRequest>(v => v.Method == HttpMethod.POST && v.Url.FullUri.Contains("ajax.php?action=index"))))
+                .Setup(o => o.Execute(It.Is<HttpRequest>(v => v.Method == HttpMethod.Post && v.Url.FullUri.Contains("ajax.php?action=index"))))
                 .Returns<HttpRequest>(r => new HttpResponse(r, new HttpHeader(), indexFeed));
 
             Mocker.GetMock<IHttpClient>()
-                .Setup(o => o.Execute(It.Is<HttpRequest>(v => v.Method == HttpMethod.POST && v.Url.FullUri.Contains("login.php"))))
+                .Setup(o => o.Execute(It.Is<HttpRequest>(v => v.Method == HttpMethod.Post && v.Url.FullUri.Contains("login.php"))))
                 .Returns<HttpRequest>(r => new HttpResponse(r, new HttpHeader(), indexFeed));
 
             var releases = Subject.FetchRecent();

src/NzbDrone.Core.Test/IndexerTests/IPTorrentsTests/IPTorrentsFixture.cs

@@ -1,5 +1,6 @@
 using System;
 using System.Linq;
+using System.Net.Http;
 using FluentAssertions;
 using Moq;
 using NUnit.Framework;
@@ -88,7 +89,7 @@ namespace NzbDrone.Core.Test.IndexerTests.IPTorrentsTests
             var recentFeed = ReadAllText(@"Files/Indexers/IPTorrents/IPTorrents.xml");
 
             Mocker.GetMock<IHttpClient>()
-                .Setup(o => o.Execute(It.Is<HttpRequest>(v => v.Method == HttpMethod.GET)))
+                .Setup(o => o.Execute(It.Is<HttpRequest>(v => v.Method == HttpMethod.Get)))
                 .Returns<HttpRequest>(r => new HttpResponse(r, new HttpHeader(), recentFeed));
 
             var releases = Subject.FetchRecent();

src/NzbDrone.Core.Test/IndexerTests/NewznabTests/NewznabFixture.cs

@@ -1,6 +1,7 @@
 using System;
 using System.Linq;
 using System.Net;
+using System.Net.Http;
 using FluentAssertions;
 using Moq;
 using NUnit.Framework;
@@ -43,7 +44,7 @@ namespace NzbDrone.Core.Test.IndexerTests.NewznabTests
             var recentFeed = ReadAllText(@"Files/Indexers/Newznab/newznab_nzb_su.xml");
 
             Mocker.GetMock<IHttpClient>()
-                .Setup(o => o.Execute(It.Is<HttpRequest>(v => v.Method == HttpMethod.GET)))
+                .Setup(o => o.Execute(It.Is<HttpRequest>(v => v.Method == HttpMethod.Get)))
                 .Returns<HttpRequest>(r => new HttpResponse(r, new HttpHeader(), recentFeed));
 
             var releases = Subject.FetchRecent();

src/NzbDrone.Core.Test/IndexerTests/NyaaTests/NyaaFixture.cs

@@ -1,5 +1,6 @@
-using System;
+using System;
 using System.Linq;
+using System.Net.Http;
 using FluentAssertions;
 using Moq;
 using NUnit.Framework;
@@ -30,7 +31,7 @@ namespace NzbDrone.Core.Test.IndexerTests.NyaaTests
             var recentFeed = ReadAllText(@"Files/Indexers/Nyaa/Nyaa.xml");
 
             Mocker.GetMock<IHttpClient>()
-                .Setup(o => o.Execute(It.Is<HttpRequest>(v => v.Method == HttpMethod.GET)))
+                .Setup(o => o.Execute(It.Is<HttpRequest>(v => v.Method == HttpMethod.Get)))
                 .Returns<HttpRequest>(r => new HttpResponse(r, new HttpHeader(), recentFeed));
 
             var releases = Subject.FetchRecent();

src/NzbDrone.Core.Test/IndexerTests/OmgwtfnzbsTests/OmgwtfnzbsFixture.cs

@@ -1,5 +1,6 @@
-using System;
+using System;
 using System.Linq;
+using System.Net.Http;
 using FluentAssertions;
 using Moq;
 using NUnit.Framework;
@@ -33,7 +34,7 @@ namespace NzbDrone.Core.Test.IndexerTests.OmgwtfnzbsTests
             var recentFeed = ReadAllText(@"Files/Indexers/Omgwtfnzbs/Omgwtfnzbs.xml");
 
             Mocker.GetMock<IHttpClient>()
-                .Setup(o => o.Execute(It.Is<HttpRequest>(v => v.Method == HttpMethod.GET)))
+                .Setup(o => o.Execute(It.Is<HttpRequest>(v => v.Method == HttpMethod.Get)))
                 .Returns<HttpRequest>(r => new HttpResponse(r, new HttpHeader(), recentFeed));
 
             var releases = Subject.FetchRecent();

src/NzbDrone.Core.Test/IndexerTests/RarbgTests/RarbgFixture.cs

@@ -1,5 +1,6 @@
-using System;
+using System;
 using System.Linq;
+using System.Net.Http;
 using FluentAssertions;
 using Moq;
 using NUnit.Framework;
@@ -35,7 +36,7 @@ namespace NzbDrone.Core.Test.IndexerTests.RarbgTests
             var recentFeed = ReadAllText(@"Files/Indexers/Rarbg/RecentFeed_v2.json");
 
             Mocker.GetMock<IHttpClient>()
-                .Setup(o => o.Execute(It.Is<HttpRequest>(v => v.Method == HttpMethod.GET)))
+                .Setup(o => o.Execute(It.Is<HttpRequest>(v => v.Method == HttpMethod.Get)))
                 .Returns<HttpRequest>(r => new HttpResponse(r, new HttpHeader(), recentFeed));
 
             var releases = Subject.FetchRecent();
@@ -62,7 +63,7 @@ namespace NzbDrone.Core.Test.IndexerTests.RarbgTests
         public void should_parse_error_20_as_empty_results()
         {
             Mocker.GetMock<IHttpClient>()
-                   .Setup(o => o.Execute(It.Is<HttpRequest>(v => v.Method == HttpMethod.GET)))
+                   .Setup(o => o.Execute(It.Is<HttpRequest>(v => v.Method == HttpMethod.Get)))
                    .Returns<HttpRequest>(r => new HttpResponse(r, new HttpHeader(), "{ error_code: 20, error: \"some message\" }"));
 
             var releases = Subject.FetchRecent();
@@ -74,7 +75,7 @@ namespace NzbDrone.Core.Test.IndexerTests.RarbgTests
         public void should_warn_on_unknown_error()
         {
             Mocker.GetMock<IHttpClient>()
-                   .Setup(o => o.Execute(It.Is<HttpRequest>(v => v.Method == HttpMethod.GET)))
+                   .Setup(o => o.Execute(It.Is<HttpRequest>(v => v.Method == HttpMethod.Get)))
                    .Returns<HttpRequest>(r => new HttpResponse(r, new HttpHeader(), "{ error_code: 25, error: \"some message\" }"));
 
             var releases = Subject.FetchRecent();

src/NzbDrone.Core.Test/IndexerTests/TorrentleechTests/TorrentleechFixture.cs

@@ -1,5 +1,6 @@
-using System;
+using System;
 using System.Linq;
+using System.Net.Http;
 using FluentAssertions;
 using Moq;
 using NUnit.Framework;
@@ -30,7 +31,7 @@ namespace NzbDrone.Core.Test.IndexerTests.TorrentleechTests
             var recentFeed = ReadAllText(@"Files/Indexers/Torrentleech/Torrentleech.xml");
 
             Mocker.GetMock<IHttpClient>()
-                .Setup(o => o.Execute(It.Is<HttpRequest>(v => v.Method == HttpMethod.GET)))
+                .Setup(o => o.Execute(It.Is<HttpRequest>(v => v.Method == HttpMethod.Get)))
                 .Returns<HttpRequest>(r => new HttpResponse(r, new HttpHeader(), recentFeed));
 
             var releases = Subject.FetchRecent();

src/NzbDrone.Core.Test/IndexerTests/TorznabTests/TorznabFixture.cs

@@ -1,5 +1,6 @@
 using System;
 using System.Linq;
+using System.Net.Http;
 using FluentAssertions;
 using Moq;
 using NUnit.Framework;
@@ -42,7 +43,7 @@ namespace NzbDrone.Core.Test.IndexerTests.TorznabTests
             var recentFeed = ReadAllText(@"Files/Indexers/Torznab/torznab_hdaccess_net.xml");
 
             Mocker.GetMock<IHttpClient>()
-                .Setup(o => o.Execute(It.Is<HttpRequest>(v => v.Method == HttpMethod.GET)))
+                .Setup(o => o.Execute(It.Is<HttpRequest>(v => v.Method == HttpMethod.Get)))
                 .Returns<HttpRequest>(r => new HttpResponse(r, new HttpHeader(), recentFeed));
 
             var releases = Subject.FetchRecent();
@@ -71,7 +72,7 @@ namespace NzbDrone.Core.Test.IndexerTests.TorznabTests
             var recentFeed = ReadAllText(@"Files/Indexers/Torznab/torznab_tpb.xml");
 
             Mocker.GetMock<IHttpClient>()
-                .Setup(o => o.Execute(It.Is<HttpRequest>(v => v.Method == HttpMethod.GET)))
+                .Setup(o => o.Execute(It.Is<HttpRequest>(v => v.Method == HttpMethod.Get)))
                 .Returns<HttpRequest>(r => new HttpResponse(r, new HttpHeader(), recentFeed));
 
             var releases = Subject.FetchRecent();

src/NzbDrone.Core/Download/Clients/DownloadStation/Proxies/DiskStationProxyBase.cs

@@ -1,6 +1,7 @@
 using System;
 using System.Collections.Generic;
 using System.Net;
+using System.Net.Http;
 using NLog;
 using NzbDrone.Common.Cache;
 using NzbDrone.Common.Http;
@@ -142,15 +143,19 @@ namespace NzbDrone.Core.Download.Clients.DownloadStation.Proxies
             return authResponse.Data.SId;
         }
 
-        protected HttpRequestBuilder BuildRequest(DownloadStationSettings settings, string methodName, int apiVersion, HttpMethod httpVerb = HttpMethod.GET)
+        protected HttpRequestBuilder BuildRequest(DownloadStationSettings settings, string methodName, int apiVersion, HttpMethod httpVerb = null)
         {
+            httpVerb ??= HttpMethod.Get;
+
             var info = GetApiInfo(_apiType, settings);
 
             return BuildRequest(settings, info, methodName, apiVersion, httpVerb);
         }
 
-        private HttpRequestBuilder BuildRequest(DownloadStationSettings settings, DiskStationApiInfo apiInfo, string methodName, int apiVersion, HttpMethod httpVerb = HttpMethod.GET)
+        private HttpRequestBuilder BuildRequest(DownloadStationSettings settings, DiskStationApiInfo apiInfo, string methodName, int apiVersion, HttpMethod httpVerb = null)
         {
+            httpVerb ??= HttpMethod.Get;
+
             var requestBuilder = new HttpRequestBuilder(settings.UseSsl, settings.Host, settings.Port).Resource($"webapi/{apiInfo.Path}");
             requestBuilder.Method = httpVerb;
             requestBuilder.LogResponseContent = true;
@@ -163,7 +168,7 @@ namespace NzbDrone.Core.Download.Clients.DownloadStation.Proxies
                 throw new ArgumentOutOfRangeException(nameof(apiVersion));
             }
 
-            if (httpVerb == HttpMethod.POST)
+            if (httpVerb == HttpMethod.Post)
             {
                 if (apiInfo.NeedsAuthentication)
                 {

src/NzbDrone.Core/Download/Clients/DownloadStation/Proxies/DownloadStationTaskProxyV1.cs

@@ -1,4 +1,5 @@
-using System.Collections.Generic;
+using System.Collections.Generic;
+using System.Net.Http;
 using NLog;
 using NzbDrone.Common.Cache;
 using NzbDrone.Common.Extensions;
@@ -21,7 +22,7 @@ namespace NzbDrone.Core.Download.Clients.DownloadStation.Proxies
 
         public void AddTaskFromData(byte[] data, string filename, string downloadDirectory, DownloadStationSettings settings)
         {
-            var requestBuilder = BuildRequest(settings, "create", 2, HttpMethod.POST);
+            var requestBuilder = BuildRequest(settings, "create", 2, HttpMethod.Post);
 
             if (downloadDirectory.IsNotNullOrWhiteSpace())
             {

src/NzbDrone.Core/Download/Clients/DownloadStation/Proxies/DownloadStationTaskProxyV2.cs

@@ -1,5 +1,6 @@
 using System.Collections.Generic;
 using System.Linq;
+using System.Net.Http;
 using NLog;
 using NzbDrone.Common.Cache;
 using NzbDrone.Common.Extensions;
@@ -22,7 +23,7 @@ namespace NzbDrone.Core.Download.Clients.DownloadStation.Proxies
 
         public void AddTaskFromData(byte[] data, string filename, string downloadDirectory, DownloadStationSettings settings)
         {
-            var requestBuilder = BuildRequest(settings, "create", 2, HttpMethod.POST);
+            var requestBuilder = BuildRequest(settings, "create", 2, HttpMethod.Post);
 
             requestBuilder.AddFormParameter("type", "\"file\"");
             requestBuilder.AddFormParameter("file", "[\"fileData\"]");

src/NzbDrone.Core/Download/Clients/Flood/FloodProxy.cs

@@ -1,6 +1,7 @@
 using System.Collections.Generic;
 using System.Linq;
 using System.Net;
+using System.Net.Http;
 using NLog;
 using NzbDrone.Common.Cache;
 using NzbDrone.Common.Http;
@@ -107,7 +108,7 @@ namespace NzbDrone.Core.Download.Clients.Flood
         {
             var verifyRequest = BuildRequest(settings).Resource("/auth/verify").Build();
 
-            verifyRequest.Method = HttpMethod.GET;
+            verifyRequest.Method = HttpMethod.Get;
 
             HandleRequest(verifyRequest, settings);
         }
@@ -180,7 +181,7 @@ namespace NzbDrone.Core.Download.Clients.Flood
         {
             var getTorrentsRequest = BuildRequest(settings).Resource("/torrents").Build();
 
-            getTorrentsRequest.Method = HttpMethod.GET;
+            getTorrentsRequest.Method = HttpMethod.Get;
 
             return Json.Deserialize<TorrentListSummary>(HandleRequest(getTorrentsRequest, settings).Content).Torrents;
         }
@@ -189,7 +190,7 @@ namespace NzbDrone.Core.Download.Clients.Flood
         {
             var contentsRequest = BuildRequest(settings).Resource($"/torrents/{hash}/contents").Build();
 
-            contentsRequest.Method = HttpMethod.GET;
+            contentsRequest.Method = HttpMethod.Get;
 
             return Json.Deserialize<List<TorrentContent>>(HandleRequest(contentsRequest, settings).Content).ConvertAll(content => content.Path);
         }
@@ -198,7 +199,7 @@ namespace NzbDrone.Core.Download.Clients.Flood
         {
             var tagsRequest = BuildRequest(settings).Resource("/torrents/tags").Build();
 
-            tagsRequest.Method = HttpMethod.PATCH;
+            tagsRequest.Method = HttpMethod.Patch;
 
             var body = new Dictionary<string, object>
             {

src/NzbDrone.Core/ImportLists/Goodreads/GoodreadsImportListBase.cs

@@ -2,6 +2,7 @@ using System;
 using System.Collections.Generic;
 using System.Collections.Specialized;
 using System.Linq;
+using System.Net.Http;
 using System.Web;
 using System.Xml.Linq;
 using System.Xml.XPath;
@@ -142,7 +143,7 @@ namespace NzbDrone.Core.ImportLists.Goodreads
         {
             var request = new Common.Http.HttpRequest(Settings.SigningUrl)
             {
-                Method = HttpMethod.POST,
+                Method = HttpMethod.Post,
             };
             request.Headers.Set("Content-Type", "application/json");
 

src/NzbDrone.Core/Indexers/Gazelle/GazelleRequestGenerator.cs

@@ -1,5 +1,6 @@
 using System;
 using System.Collections.Generic;
+using System.Net.Http;
 using NLog;
 using NzbDrone.Common.Cache;
 using NzbDrone.Common.Extensions;
@@ -71,7 +72,7 @@ namespace NzbDrone.Core.Indexers.Gazelle
             };
 
             indexRequestBuilder.SetCookies(cookies);
-            indexRequestBuilder.Method = HttpMethod.POST;
+            indexRequestBuilder.Method = HttpMethod.Post;
             indexRequestBuilder.Resource("ajax.php?action=index");
 
             var authIndexRequest = indexRequestBuilder
@@ -92,7 +93,7 @@ namespace NzbDrone.Core.Indexers.Gazelle
                 LogResponseContent = true
             };
 
-            requestBuilder.Method = HttpMethod.POST;
+            requestBuilder.Method = HttpMethod.Post;
             requestBuilder.Resource("login.php");
             requestBuilder.PostProcess += r => r.RequestTimeout = TimeSpan.FromSeconds(15);
 

src/NzbDrone.Core/Messaging/Commands/CommandExecutor.cs

@@ -47,11 +47,6 @@ namespace NzbDrone.Core.Messaging.Commands
                     }
                 }
             }
-            catch (ThreadAbortException ex)
-            {
-                _logger.Error(ex, "Thread aborted");
-                Thread.ResetAbort();
-            }
             catch (OperationCanceledException)
             {
                 _logger.Trace("Stopped one command execution pipeline");

src/NzbDrone.Core/Notifications/Discord/DiscordProxy.cs

@@ -1,3 +1,4 @@
+using System.Net.Http;
 using NLog;
 using NzbDrone.Common.Http;
 using NzbDrone.Common.Serializer;
@@ -29,7 +30,7 @@ namespace NzbDrone.Core.Notifications.Discord
                     .Accept(HttpAccept.Json)
                     .Build();
 
-                request.Method = HttpMethod.POST;
+                request.Method = HttpMethod.Post;
                 request.Headers.ContentType = "application/json";
                 request.SetContent(payload.ToJson());
 

src/NzbDrone.Core/Notifications/Goodreads/GoodreadsNotificationBase.cs

@@ -2,6 +2,7 @@ using System;
 using System.Collections.Generic;
 using System.Collections.Specialized;
 using System.Linq;
+using System.Net.Http;
 using System.Text;
 using System.Web;
 using System.Xml.Linq;
@@ -112,11 +113,11 @@ namespace NzbDrone.Core.Notifications.Goodreads
             // we need the url without the query to sign
             auth.RequestUrl = request.Url.SetQuery(null).FullUri;
 
-            if (builder.Method == HttpMethod.GET)
+            if (builder.Method == HttpMethod.Get)
             {
                 auth.Parameters = builder.QueryParams.ToDictionary(x => x.Key, x => x.Value);
             }
-            else if (builder.Method == HttpMethod.POST)
+            else if (builder.Method == HttpMethod.Post)
             {
                 auth.Parameters = builder.FormData.ToDictionary(x => x.Name, x => Encoding.UTF8.GetString(x.ContentData));
             }
@@ -172,7 +173,7 @@ namespace NzbDrone.Core.Notifications.Goodreads
         {
             var request = new Common.Http.HttpRequest(Settings.SigningUrl)
             {
-                Method = HttpMethod.POST,
+                Method = HttpMethod.Post,
             };
             request.Headers.Set("Content-Type", "application/json");
 

src/NzbDrone.Core/Notifications/Join/JoinProxy.cs

@@ -1,4 +1,5 @@
 using System;
+using System.Net.Http;
 using FluentValidation.Results;
 using NLog;
 using NzbDrone.Common.Extensions;
@@ -27,7 +28,7 @@ namespace NzbDrone.Core.Notifications.Join
 
         public void SendNotification(string title, string message, JoinSettings settings)
         {
-            var method = HttpMethod.GET;
+            var method = HttpMethod.Get;
 
             try
             {

src/NzbDrone.Core/Notifications/Mailgun/MailgunProxy.cs

@@ -1,7 +1,7 @@
 using System.Net;
+using System.Net.Http;
 using NLog;
 using NzbDrone.Common.Http;
-using HttpMethod = NzbDrone.Common.Http.HttpMethod;
 
 namespace NzbDrone.Core.Notifications.Mailgun
 {
@@ -27,7 +27,7 @@ namespace NzbDrone.Core.Notifications.Mailgun
         {
             try
             {
-                var request = BuildRequest(settings, $"{settings.SenderDomain}/messages", HttpMethod.POST, title, message).Build();
+                var request = BuildRequest(settings, $"{settings.SenderDomain}/messages", HttpMethod.Post, title, message).Build();
                 _httpClient.Execute(request);
             }
             catch (HttpException ex)

src/NzbDrone.Core/Notifications/PushBullet/PushBulletProxy.cs

@@ -2,6 +2,7 @@ using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Net;
+using System.Net.Http;
 using FluentValidation.Results;
 using NLog;
 using NzbDrone.Common.Extensions;
@@ -100,7 +101,7 @@ namespace NzbDrone.Core.Notifications.PushBullet
 
                 var request = requestBuilder.Build();
 
-                request.Method = HttpMethod.GET;
+                request.Method = HttpMethod.Get;
                 request.Credentials = new BasicNetworkCredential(settings.ApiKey, string.Empty);
 
                 var response = _httpClient.Execute(request);

src/NzbDrone.Core/Notifications/SendGrid/SendGridProxy.cs

@@ -1,4 +1,5 @@
-using System.Net;
+using System.Net;
+using System.Net.Http;
 using NzbDrone.Common.Http;
 using NzbDrone.Common.Serializer;
 
@@ -22,7 +23,7 @@ namespace NzbDrone.Core.Notifications.SendGrid
         {
             try
             {
-                var request = BuildRequest(settings, "mail/send", HttpMethod.POST);
+                var request = BuildRequest(settings, "mail/send", HttpMethod.Post);
 
                 var payload = new SendGridPayload
                 {

src/NzbDrone.Core/Notifications/Slack/SlackProxy.cs

@@ -1,3 +1,4 @@
+using System.Net.Http;
 using NLog;
 using NzbDrone.Common.Http;
 using NzbDrone.Common.Serializer;
@@ -29,7 +30,7 @@ namespace NzbDrone.Core.Notifications.Slack
                     .Accept(HttpAccept.Json)
                     .Build();
 
-                request.Method = HttpMethod.POST;
+                request.Method = HttpMethod.Post;
                 request.Headers.ContentType = "application/json";
                 request.SetContent(payload.ToJson());
 

src/NzbDrone.Core/Notifications/Subsonic/SubsonicServerProxy.cs

@@ -1,4 +1,5 @@
 using System.IO;
+using System.Net.Http;
 using System.Xml.Linq;
 using NLog;
 using NzbDrone.Common.Extensions;
@@ -36,7 +37,7 @@ namespace NzbDrone.Core.Notifications.Subsonic
         public void Notify(SubsonicSettings settings, string message)
         {
             var resource = "addChatMessage";
-            var request = GetSubsonicServerRequest(resource, HttpMethod.GET, settings);
+            var request = GetSubsonicServerRequest(resource, HttpMethod.Get, settings);
             request.AddQueryParam("message", message);
 
             var response = _httpClient.Execute(request.Build());
@@ -48,7 +49,7 @@ namespace NzbDrone.Core.Notifications.Subsonic
         public void Update(SubsonicSettings settings)
         {
             var resource = "startScan";
-            var request = GetSubsonicServerRequest(resource, HttpMethod.GET, settings);
+            var request = GetSubsonicServerRequest(resource, HttpMethod.Get, settings);
             var response = _httpClient.Execute(request.Build());
 
             _logger.Trace("Update response: {0}", response.Content);
@@ -57,7 +58,7 @@ namespace NzbDrone.Core.Notifications.Subsonic
 
         public string Version(SubsonicSettings settings)
         {
-            var request = GetSubsonicServerRequest("ping", HttpMethod.GET, settings);
+            var request = GetSubsonicServerRequest("ping", HttpMethod.Get, settings);
             var response = _httpClient.Execute(request.Build());
 
             _logger.Trace("Version response: {0}", response.Content);

src/NzbDrone.Core/Notifications/Webhook/WebhookMethod.cs

@@ -1,10 +1,8 @@
-using NzbDrone.Common.Http;
-
 namespace NzbDrone.Core.Notifications.Webhook
 {
     public enum WebhookMethod
     {
-        POST = HttpMethod.POST,
+        POST = 1,
-        PUT = HttpMethod.PUT
+        PUT = 2
     }
 }

src/NzbDrone.Core/Notifications/Webhook/WebhookProxy.cs

@@ -1,4 +1,5 @@
-using System.Net;
+using System;
+using System.Net.Http;
 using NzbDrone.Common.Extensions;
 using NzbDrone.Common.Http;
 using NzbDrone.Common.Serializer;
@@ -27,7 +28,13 @@ namespace NzbDrone.Core.Notifications.Webhook
                     .Accept(HttpAccept.Json)
                     .Build();
 
-                request.Method = (HttpMethod)settings.Method;
+                request.Method = settings.Method switch
+                {
+                    (int)WebhookMethod.POST => HttpMethod.Post,
+                    (int)WebhookMethod.PUT => HttpMethod.Put,
+                    _ => throw new ArgumentOutOfRangeException($"Invalid Webhook method {settings.Method}")
+                };
+
                 request.Headers.ContentType = "application/json";
                 request.SetContent(body.ToJson());
 

src/NzbDrone.Core/TinyTwitter.cs

@@ -3,6 +3,7 @@ using System.Collections.Generic;
 using System.IO;
 using System.Linq;
 using System.Net;
+using System.Net.Http;
 using System.Security.Cryptography;
 using System.Text;
 using System.Text.RegularExpressions;
@@ -37,7 +38,7 @@ namespace TinyTwitter
 
         public void UpdateStatus(string message)
         {
-            new RequestBuilder(_oauth, "POST", "https://api.twitter.com/1.1/statuses/update.json")
+            new RequestBuilder(_oauth, HttpMethod.Post, "https://api.twitter.com/1.1/statuses/update.json")
                 .AddParameter("status", message)
                 .Execute();
         }
@@ -51,7 +52,7 @@ namespace TinyTwitter
          **/
         public void DirectMessage(string message, string screenName)
         {
-            new RequestBuilder(_oauth, "POST", "https://api.twitter.com/1.1/direct_messages/new.json")
+            new RequestBuilder(_oauth, HttpMethod.Post, "https://api.twitter.com/1.1/direct_messages/new.json")
                 .AddParameter("text", message)
                 .AddParameter("screen_name", screenName)
                 .Execute();
@@ -63,16 +64,18 @@ namespace TinyTwitter
             private const string SIGNATURE_METHOD = "HMAC-SHA1";
 
             private readonly OAuthInfo _oauth;
-            private readonly string _method;
+            private readonly HttpMethod _method;
             private readonly IDictionary<string, string> _customParameters;
             private readonly string _url;
+            private readonly HttpClient _httpClient;
 
-            public RequestBuilder(OAuthInfo oauth, string method, string url)
+            public RequestBuilder(OAuthInfo oauth, HttpMethod method, string url)
             {
                 _oauth = oauth;
                 _method = method;
                 _url = url;
                 _customParameters = new Dictionary<string, string>();
+                _httpClient = new ();
             }
 
             public RequestBuilder AddParameter(string name, string value)
@@ -92,61 +95,13 @@ namespace TinyTwitter
                 var signature = GenerateSignature(parameters);
                 var headerValue = GenerateAuthorizationHeaderValue(parameters, signature);
 
-                var request = (HttpWebRequest)WebRequest.Create(GetRequestUrl());
+                var request = new HttpRequestMessage(_method, _url);
-                request.Method = _method;
+                request.Content = new FormUrlEncodedContent(_customParameters);
-                request.ContentType = "application/x-www-form-urlencoded";
 
                 request.Headers.Add("Authorization", headerValue);
 
-                WriteRequestBody(request);
+                var response = _httpClient.Send(request);
-
+                return response.Content.ReadAsStringAsync().GetAwaiter().GetResult();
-                // It looks like a bug in HttpWebRequest. It throws random TimeoutExceptions
-                // after some requests. Abort the request seems to work. More info:
-                // http://stackoverflow.com/questions/2252762/getrequeststream-throws-timeout-exception-randomly
-                var response = request.GetResponse();
-
-                string content;
-
-                using (var stream = response.GetResponseStream())
-                {
-                    using (var reader = new StreamReader(stream))
-                    {
-                        content = reader.ReadToEnd();
-                    }
-                }
-
-                request.Abort();
-
-                return content;
-            }
-
-            private void WriteRequestBody(HttpWebRequest request)
-            {
-                if (_method == "GET")
-                {
-                    return;
-                }
-
-                var requestBody = Encoding.ASCII.GetBytes(GetCustomParametersString());
-                using (var stream = request.GetRequestStream())
-                {
-                    stream.Write(requestBody, 0, requestBody.Length);
-                }
-            }
-
-            private string GetRequestUrl()
-            {
-                if (_method != "GET" || _customParameters.Count == 0)
-                {
-                    return _url;
-                }
-
-                return string.Format("{0}?{1}", _url, GetCustomParametersString());
-            }
-
-            private string GetCustomParametersString()
-            {
-                return _customParameters.Select(x => string.Format("{0}={1}", x.Key, x.Value)).Join("&");
             }
 
             private string GenerateAuthorizationHeaderValue(IEnumerable<KeyValuePair<string, string>> parameters, string signature)

src/NzbDrone.Integration.Test/IndexHtmlFixture.cs

@@ -1,5 +1,6 @@
-using System.Linq;
+using System;
-using System.Net;
+using System.Net.Http;
+using System.Net.Http.Headers;
 using FluentAssertions;
 using NUnit.Framework;
 
@@ -8,25 +9,30 @@ namespace NzbDrone.Integration.Test
     [TestFixture]
     public class IndexHtmlFixture : IntegrationTest
     {
+        private HttpClient _httpClient = new HttpClient();
+
         [Test]
         public void should_get_index_html()
         {
-            var text = new WebClient().DownloadString(RootUrl);
+            var request = new HttpRequestMessage(HttpMethod.Get, RootUrl);
+            var response = _httpClient.Send(request);
+            var text = response.Content.ReadAsStringAsync().GetAwaiter().GetResult();
             text.Should().NotBeNullOrWhiteSpace();
         }
 
         [Test]
         public void index_should_not_be_cached()
         {
-            var client = new WebClient();
+            var request = new HttpRequestMessage(HttpMethod.Get, RootUrl);
-            _ = client.DownloadString(RootUrl);
+            var response = _httpClient.Send(request);
+
+            var headers = response.Headers;
 
-            var headers = client.ResponseHeaders;
+            headers.CacheControl.NoStore.Should().BeTrue();
+            headers.CacheControl.NoCache.Should().BeTrue();
+            headers.Pragma.Should().Contain(new NameValueHeaderValue("no-cache"));
 
-            headers.Get("Cache-Control").Split(',').Select(x => x.Trim())
+            response.Content.Headers.Expires.Should().BeBefore(DateTime.UtcNow);
-                .Should().BeEquivalentTo("no-store, no-cache".Split(',').Select(x => x.Trim()));
-            headers.Get("Pragma").Should().Be("no-cache");
-            headers.Get("Expires").Should().Be("-1");
         }
     }
 }