[Mono-dev] HttpWebResponse ConnectStream blocks on empty stream

Arne Claassen arnec at mindtouch.com
Tue Feb 3 12:29:13 EST 2009

I've been having a problem with HttpWebResponse locking up on  
GetResponseSream and BeingGetResponseStream never returning on  
responses that have no content-length header and no content. On .NET  
this will return immediately, but on mono (1.9.1, 2.0.1 and 2.02) the  
read will block only to be killed if the request itself has a timeout.  
A simple repro is to his a site, get it's Etag/LastModified and hit it  
again for the 304 response which should have no content. However  
getting that response stream still shouldn't lock up.

I couldn't find a bug on this yet, but wanted to check here before  

Repro -----------------------------------------------------
using System;
using System.IO;
using System.Net;

namespace BugRepro {
     class Program {
         const string URL = "http://blog.developer.mindtouch.com/feed/";

         static void Main(string[] args) {
             // first request (which should be 200)
             HttpWebRequest request = WebRequest.Create(URL) as  
             request.Method = "GET";
             HttpWebResponse response =  
             Console.WriteLine("response: {0}", response.StatusCode);
             Stream stream = response.GetResponseStream();
             byte[] buffer = new byte[4096];
             int read = stream.Read(buffer, 0, buffer.Length);
             Console.WriteLine("{0} bytes read", read);

             // second request which should be 304)
             request = WebRequest.Create(URL) as HttpWebRequest;
             request.Method = "GET";
             request.IfModifiedSince = response.LastModified;
             try {
                 response = (HttpWebResponse)request.GetResponse();
             } catch(WebException e) {
                 response = (HttpWebResponse)e.Response;
             Console.WriteLine("response: {0}", response.StatusCode);
             stream = response.GetResponseStream();
             buffer = new byte[4096];
             read = stream.Read(buffer, 0, buffer.Length);

             // don't get here until the request timeout hits
             Console.WriteLine("{0} bytes read", read);
Repro -----------------------------------------------------

Arne Claassen

San Diego, CA

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