Bug 8373 - HTTP 307, POST, Chunked Encoding and 100-continue
Summary: HTTP 307, POST, Chunked Encoding and 100-continue
Alias: None
Product: Class Libraries
Classification: Mono
Component: System ()
Version: master
Hardware: PC Mac OS
: --- normal
Target Milestone: Untriaged
Assignee: Martin Baulig
Depends on:
Reported: 2012-11-13 12:17 UTC by Martin Baulig
Modified: 2016-11-11 10:16 UTC (History)
1 user (show)

Is this bug a regression?: ---
Last known good build:

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Description Martin Baulig 2012-11-13 12:17:57 UTC
A few days ago, while I was playing around with some WCF samples, I stumbled upon a problem in our HTTP stack related to HTTP 307, Chunked Encoding and POST.

There are several sub-issues to this problem:

1.) When the server replies with 307 Temporary Redirect to a POST request, the request body won't be submitted when resending the request to the new address.

2.) mod_mono reports a 500 Internal Server Error when trying to use chunked encoding, I ran a simple client app on Windows to make sure it's not a problem with sending the request.

3.) When making a request that contains a request body with HTTP 1.1, the .NET runtime waits 350 milliseconds for the 100-Continue before sending the body: http://blogs.msdn.com/b/fiddler/archive/2011/11/05/http-expect-continue-delays-transmitting-post-bodies-by-up-to-350-milliseconds.aspx

4.) Re-transmitting the request when using chunked encoding.  Our implementation does not buffer the request body when using chunked encoding.  I was wondering what to do when encountering a 307, so I played around a bit with a very simple TcpListener that speaks http, making it send/not send the 100-continue.  It looks like the .NET runtime is using the HttpWebRequest.AllowWriteStreamBuffering property to decide whether or not to buffer the request - you get an error if you either set that to false or the server did not send the 100-continue in time.  So this may actually be easy to fix.

I'm working on this, just wanted to gather a list of all the sub-issues that need to be addressed.
Comment 2 Martin Baulig 2016-11-11 10:16:00 UTC
This has been fixed a long time ago.