Make OriginalUrl readonly.

Add a new property (RequestUriString) which can be overridden in user code

Author: honfika

src/Titanium.Web.Proxy/Helpers/HttpRequestWriter.cs

@@ -23,7 +23,7 @@ internal HttpRequestWriter(Stream stream, IBufferPool bufferPool, int bufferSize
         internal async Task WriteRequestAsync(Request request, bool flush = true,
             CancellationToken cancellationToken = default)
         {
-            await WriteLineAsync(Request.CreateRequestLine(request.Method, request.OriginalUrl, request.HttpVersion),
+            await WriteLineAsync(Request.CreateRequestLine(request.Method, request.RequestUriString, request.HttpVersion),
                 cancellationToken);
             await WriteAsync(request, flush, cancellationToken);
         }

src/Titanium.Web.Proxy/Http/HttpWebClient.cs

@@ -99,7 +99,7 @@ internal async Task SendRequest(bool enable100ContinueBehaviour, bool isTranspar
 
             // prepare the request & headers
             await writer.WriteLineAsync(Request.CreateRequestLine(Request.Method,
-                useUpstreamProxy || isTransparent ? Request.OriginalUrl : Request.RequestUri.PathAndQuery,
+                useUpstreamProxy || isTransparent ? Request.RequestUriString : Request.RequestUri.PathAndQuery,
                 Request.HttpVersion), cancellationToken);
 
             var headerBuilder = new StringBuilder();

src/Titanium.Web.Proxy/Http/Request.cs

@@ -14,6 +14,8 @@ namespace Titanium.Web.Proxy.Http
     [TypeConverter(typeof(ExpandableObjectConverter))]
     public class Request : RequestResponseBase
     {
+        private string originalUrl;
+
         /// <summary>
         ///     Request Method.
         /// </summary>
@@ -32,7 +34,20 @@ public class Request : RequestResponseBase
         /// <summary>
         ///     The original request Url.
         /// </summary>
-        public string OriginalUrl { get; set; }
+        public string OriginalUrl
+        {
+            get => originalUrl;
+            internal set
+            {
+                originalUrl = value;
+                RequestUriString = value;
+            }
+        }
+
+        /// <summary>
+        ///     The request uri as it is in the HTTP header
+        /// </summary>
+        public string RequestUriString { get; set; }
 
         /// <summary>
         ///     Has request body?
@@ -140,7 +155,7 @@ public override string HeaderText
             get
             {
                 var sb = new StringBuilder();
-                sb.Append($"{CreateRequestLine(Method, OriginalUrl, HttpVersion)}{ProxyConstants.NewLine}");
+                sb.Append($"{CreateRequestLine(Method, RequestUriString, HttpVersion)}{ProxyConstants.NewLine}");
                 foreach (var header in Headers)
                 {
                     sb.Append($"{header.ToString()}{ProxyConstants.NewLine}");

src/Titanium.Web.Proxy/ResponseHandler.cs

@@ -92,7 +92,7 @@ private async Task handleHttpSessionResponse(SessionEventArgs args)
                 // clear current response
                 await args.ClearResponse(cancellationToken);
                 var httpCmd = Request.CreateRequestLine(args.HttpClient.Request.Method, 
-                    args.HttpClient.Request.OriginalUrl, args.HttpClient.Request.HttpVersion);
+                    args.HttpClient.Request.RequestUriString, args.HttpClient.Request.HttpVersion);
                 await handleHttpSessionRequest(httpCmd, args, null, args.ClientConnection.NegotiatedApplicationProtocol,
                             cancellationToken, args.CancellationTokenSource);
                 return;

tests/Titanium.Web.Proxy.IntegrationTests/Helpers/HttpContinueClient.cs

@@ -20,7 +20,7 @@ public async Task<Response> Post(string server, int port, string content)
             var request = new Request
             {
                 Method = "POST",
-                OriginalUrl = "/",
+                RequestUriString = "/",
                 HttpVersion = new Version(1, 1)
             };
             request.Headers.AddHeader(KnownHeaders.Host, server);

tests/Titanium.Web.Proxy.IntegrationTests/Helpers/HttpMessageParsing.cs

@@ -26,7 +26,7 @@ internal static Request ParseRequest(string messageText, bool requireBody)
                 RequestResponseBase request = new Request()
                 {
                     Method = method,
-                    OriginalUrl = url,
+                    RequestUriString = url,
                     HttpVersion = version
                 };
                 while (!string.IsNullOrEmpty(line = reader.ReadLine()))