Fixed: Resource leakage inside ManagedHttpDispatcher.

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

@@ -20,7 +20,11 @@ namespace NzbDrone.Common.Http.Dispatchers
 
         public HttpResponse GetResponse(HttpRequest request, CookieContainer cookies)
         {
-            var webRequest = (HttpWebRequest)WebRequest.Create((Uri)request.Url);
+            HttpWebResponse httpWebResponse = null;
+            HttpWebRequest webRequest = null;
+            try
+            {
+                webRequest = (HttpWebRequest) WebRequest.Create((Uri) request.Url);
 
                 // Deflate is not a standard and could break depending on implementation.
                 // we should just stick with the more compatible Gzip
@@ -28,14 +32,16 @@ namespace NzbDrone.Common.Http.Dispatchers
                 webRequest.AutomaticDecompression = DecompressionMethods.GZip;
 
                 webRequest.Method = request.Method.ToString();
-            webRequest.UserAgent = request.UseSimplifiedUserAgent ? UserAgentBuilder.UserAgentSimplified : UserAgentBuilder.UserAgent;
+                webRequest.UserAgent = request.UseSimplifiedUserAgent
+                    ? UserAgentBuilder.UserAgentSimplified
+                    : UserAgentBuilder.UserAgent;
                 webRequest.KeepAlive = request.ConnectionKeepAlive;
                 webRequest.AllowAutoRedirect = false;
                 webRequest.CookieContainer = cookies;
 
                 if (request.RequestTimeout != TimeSpan.Zero)
                 {
-                webRequest.Timeout = (int)Math.Ceiling(request.RequestTimeout.TotalMilliseconds);
+                    webRequest.Timeout = (int) Math.Ceiling(request.RequestTimeout.TotalMilliseconds);
                 }
 
                 AddProxy(webRequest, request);
@@ -54,11 +60,9 @@ namespace NzbDrone.Common.Http.Dispatchers
                     }
                 }
 
-            HttpWebResponse httpWebResponse;
-
                 try
                 {
-                httpWebResponse = (HttpWebResponse)webRequest.GetResponse();
+                    httpWebResponse = (HttpWebResponse) webRequest.GetResponse();
                 }
                 catch (WebException e)
                 {
@@ -67,7 +71,7 @@ namespace NzbDrone.Common.Http.Dispatchers
                         SecurityProtocolPolicy.DisableTls12();
                     }
 
-                httpWebResponse = (HttpWebResponse)e.Response;
+                    httpWebResponse = (HttpWebResponse) e.Response;
 
                     if (httpWebResponse == null)
                     {
@@ -85,7 +89,15 @@ namespace NzbDrone.Common.Http.Dispatchers
                     }
                 }
 
-            return new HttpResponse(request, new HttpHeader(httpWebResponse.Headers), data, httpWebResponse.StatusCode);
+                return new HttpResponse(request, new HttpHeader(httpWebResponse.Headers), data,
+                    httpWebResponse.StatusCode);
+            }
+            finally
+            {
+                webRequest = null;
+                httpWebResponse?.Dispose();
+                httpWebResponse = null;
+            }
         }
 
         protected virtual void AddProxy(HttpWebRequest webRequest, HttpRequest request)