Handle request line correctlly

This coudl fix #937

shadowsocks-csharp/Controller/Service/HttpHandler.cs

@@ -64,7 +64,7 @@ namespace Shadowsocks.Controller.Service
             Close();
         }
 
-        private static readonly Regex HttpRequestHeaderRegex = new Regex(@"^([A-Z]+?) ([^\s]+) HTTP/1\.\d$");
+        private static readonly Regex HttpRequestHeaderRegex = new Regex(@"^(?<method>[A-Z]+?) (?<path>[^\s]+) (?<tail>HTTP/1\.\d)$");
 
         private int _requestLineCount = 0;
         private bool _isConnect = false;
@@ -101,31 +101,57 @@ namespace Shadowsocks.Controller.Service
 
             Logging.Debug(line);
 
-            if (!line.StartsWith("Proxy-"))
-            {
-                _headers.Enqueue(line);
-            }
-
             if (_requestLineCount == 0)
             {
                 var m = HttpRequestHeaderRegex.Match(line);
                 if (m.Success)
                 {
-                    var method = m.Groups[1].Value;
+                    var method = m.Groups["method"].Value;
+                    var path = m.Groups["path"].Value;
 
                     if (method == "CONNECT")
                     {
                         _isConnect = true;
 
-                        if (!ParseHost(m.Groups[2].Value))
+                        if (!ParseHost(path))
                         {
                             throw new Exception("Bad http header: " + line);
                         }
                     }
+                    else
+                    {
+                        var targetUrl = new Uri(path);
+
+                        if (!ParseHost(targetUrl.Authority))
+                        {
+                            throw new Exception("Bad http header: " + line);
+                        }
+
+                        var newRequestLine = $"{method} {targetUrl.PathAndQuery} {m.Groups["tail"].Value}";
+                        _headers.Enqueue(newRequestLine);
+                    }
+                }
+                else
+                {
+                    throw new FormatException("Not a vaild request line");
                 }
             }
             else
             {
+                // Handle Proxy-x Headers
+
+                if (!line.StartsWith("Proxy-"))
+                {
+                    _headers.Enqueue(line);
+                }
+                else
+                {
+                    if (line.StartsWith("Proxy-Connection: "))
+                    {
+                        _headers.Enqueue(line.Substring(6));
+                    }
+                }
+
                 if (line.IsNullOrEmpty())
                 {
                     return true;