don't strip request body if we don't recognize the request method (#294)

* don't strip request body if we don't recognize the request method

* use IsNullOrEmpty

src/WireMock.Net/Util/BodyParser.cs

@@ -2,6 +2,7 @@
 using MimeKit;
 using Newtonsoft.Json;
 using System;
+using System.Collections.Generic;
 using System.IO;
 using System.Linq;
 using System.Text;
@@ -27,7 +28,18 @@ namespace WireMock.Util
             CONNECT - No defined body semantics
             PATCH - Body supported.
         */
-        private static readonly string[] AllowedBodyParseMethods = { "PUT", "POST", "OPTIONS", "PATCH" };
+        private static readonly IDictionary<string, bool> BodyAllowedForMethods = new Dictionary<string, bool>
+        {
+            { "HEAD", false },
+            { "GET", false },
+            { "PUT", true },
+            { "POST", true },
+            { "DELETE", false },
+            { "TRACE", false },
+            { "OPTIONS", true },
+            { "CONNECT", false },
+            { "PATCH", true }
+        };
 
         private static readonly IStringMatcher[] MultipartContentTypesMatchers = {
             new WildcardMatcher("multipart/*", true)
@@ -53,7 +65,19 @@ namespace WireMock.Util
 
         public static bool ShouldParseBody([CanBeNull] string method)
         {
-            return AllowedBodyParseMethods.Contains(method, StringComparer.OrdinalIgnoreCase);
+            if (String.IsNullOrEmpty(method))
+            {
+                return false;
+            }
+            if (BodyAllowedForMethods.TryGetValue(method.ToUpper(), out var allowed))
+            {
+                return allowed;
+            }
+            // If we don't have any knowledge of this method, we should assume that a body *may*
+            // be present, so we should parse it if it is. Therefore, if a new method is added to
+            // the HTTP Method Registry, we only really need to add it to BodyAllowedForMethods if
+            // we want to make it clear that a body is *not* allowed.
+            return true;
         }
 
         public static BodyType DetectBodyTypeFromContentType([CanBeNull] string contentTypeValue)