Throw better exception when chunk length is invalid.

Author: honfika

src/Titanium.Web.Proxy/EventArguments/LimitedStream.cs

@@ -4,6 +4,7 @@
 using System.Threading.Tasks;
 using StreamExtended;
 using StreamExtended.Network;
+using Titanium.Web.Proxy.Exceptions;
 
 namespace Titanium.Web.Proxy.EventArguments
 {
@@ -60,7 +61,11 @@ private void getNextChunk()
                 chunkHead = chunkHead.Substring(0, idx);
             }
 
-            int chunkSize = int.Parse(chunkHead, NumberStyles.HexNumber);
+            if (!int.TryParse(chunkHead, NumberStyles.HexNumber, null, out int chunkSize))
+            {
+                throw new ProxyHttpException($"Invalid chunk length: '{chunkSize}'", null, null);
+            }
+
             bytesRemaining = chunkSize;
 
             if (chunkSize == 0)

src/Titanium.Web.Proxy/Http2/Http2Helper.cs

@@ -41,7 +41,7 @@ internal static async Task SendHttp2(Stream clientStream, Stream serverStream, i
         {
             var clientSettings = new Http2Settings();
             var serverSettings = new Http2Settings();
-            ;
+
             var sessions = new ConcurrentDictionary<int, SessionEventArgs>();
 
             // Now async relay all server=>client & client=>server data