Move HasRequestBody to HttpUtls + specify ContentLength=0 when body=null

Author: mythz

src/ServiceStack.Text.sln

@@ -1,6 +1,7 @@
-Microsoft Visual Studio Solution File, Format Version 12.00
+
+Microsoft Visual Studio Solution File, Format Version 12.00
 # Visual Studio 15
-VisualStudioVersion = 15.0.26730.3
+VisualStudioVersion = 15.0.27004.2009
 MinimumVisualStudioVersion = 10.0.40219.1
 Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "build", "build", "{F7FB50ED-EAFF-4839-935A-5BB4A4158245}"
 	ProjectSection(SolutionItems) = preProject
@@ -9,6 +10,7 @@ Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "build", "build", "{F7FB50ED
 		..\build\build.tasks = ..\build\build.tasks
 		..\build\copy.bat = ..\build\copy.bat
 		..\README.md = ..\README.md
+		..\NuGet\ServiceStack.Text.Core\servicestack.text.core.nuspec = ..\NuGet\ServiceStack.Text.Core\servicestack.text.core.nuspec
 		..\NuGet\ServiceStack.Text\servicestack.text.nuspec = ..\NuGet\ServiceStack.Text\servicestack.text.nuspec
 	EndProjectSection
 EndProject

src/ServiceStack.Text/HttpUtils.cs

@@ -106,6 +106,20 @@ public static string SetHashParam(this string url, string key, string val)
             return url + prefix + key + "=" + val.UrlEncode();
         }
 
+        public static bool HasRequestBody(this string httpMethod)
+        {
+            switch (httpMethod)
+            {
+                case HttpMethods.Get:
+                case HttpMethods.Delete:
+                case HttpMethods.Head:
+                case HttpMethods.Options:
+                    return false;
+            }
+
+            return true;
+        }
+
         public static string GetJsonFromUrl(this string url,
             Action<HttpWebRequest> requestFilter = null, Action<HttpWebResponse> responseFilter = null)
         {
@@ -520,6 +534,10 @@ public static string SendStringToUrl(this string url, string method = null,
                     writer.Write(requestBody);
                 }
             }
+            else if (method != null && method.HasRequestBody())
+            {
+                webReq.ContentLength = 0;
+            }
 
             using (var webRes = PclExport.Instance.GetResponse(webReq))
             using (var stream = webRes.GetResponseStream())