Why does IIS not support chunked transfer encoding?

Posted by Graeme Perrow on Stack Overflow See other posts from Stack Overflow or by Graeme Perrow
Published on 2008-12-03T20:45:42Z Indexed on 2010/03/30 17:03 UTC
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http

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chunked

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iis

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apache

I am making an HTTP connection to an IIS web server and sending a POST request with the data encoded using Transfer-Encoding: chunked. When I do this, IIS simply closes the connection, with no error message or status code. According to the HTTP 1.1 spec,

All HTTP/1.1 applications MUST be able to receive and decode the "chunked" transfer-coding

so I don't understand why it's (a) not handling that encoding and (b) it's not sending back a status code. If I change the request to send the Content-Length rather than Transfer-Encoding, the query succeeds, but that's not always possible.

When I try the same thing against Apache, I get a "411 Length required" status and a message saying "chunked Transfer-Encoding forbidden".

Why do these servers not support this encoding?

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