Applied workaround for CurlSharp GC handling.

src/NzbDrone.Common/Http/CurlHttpClient.cs

@@ -45,7 +45,8 @@ namespace NzbDrone.Common.Http
                 Stream responseStream = new MemoryStream();
                 Stream headerStream = new MemoryStream();
 
-                var curlEasy = new CurlEasy();
+                using (var curlEasy = new CurlEasy())
+                {
                     curlEasy.AutoReferer = false;
                     curlEasy.WriteFunction = (b, s, n, o) =>
                     {
@@ -73,11 +74,14 @@ namespace NzbDrone.Common.Http
                     if (!httpRequest.Body.IsNullOrWhiteSpace())
                     {
                         // TODO: This might not go well with encoding.
-                    curlEasy.PostFields = httpRequest.Body;
                         curlEasy.PostFieldSize = httpRequest.Body.Length;
+                        curlEasy.SetOpt(CurlOption.CopyPostFields, httpRequest.Body);
                     }
 
-                curlEasy.HttpHeader = SerializeHeaders(webRequest);
+                    // Yes, we have to keep a ref to the object to prevent corrupting the unmanaged state
+                    using (var httpRequestHeaders = SerializeHeaders(webRequest))
+                    {
+                        curlEasy.HttpHeader = httpRequestHeaders;
 
                         var result = curlEasy.Perform();
 
@@ -85,6 +89,7 @@ namespace NzbDrone.Common.Http
                         {
                             throw new WebException(string.Format("Curl Error {0} for Url {1}", result, curlEasy.Url));
                         }
+                    }
 
                     var webHeaderCollection = ProcessHeaderStream(webRequest, headerStream);
                     var responseData = ProcessResponseStream(webRequest, responseStream, webHeaderCollection);
@@ -94,6 +99,7 @@ namespace NzbDrone.Common.Http
                     return new HttpResponse(httpRequest, httpHeader, responseData, (HttpStatusCode)curlEasy.ResponseCode);
                 }
             }
+        }
 
         private CurlSlist SerializeHeaders(HttpWebRequest webRequest)
         {