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Libcurl request generating HTTP/1.1 411 Length Required error

From: Jacob Swed <>
Date: Wed, 17 Dec 2003 20:19:46 -0800

The library version being used is 7.11.0-20031217. Compiled under OS X
10.2.8 with --disable-ipv6.

When curl issues a PUT (or other custom header the pushes data) is not
including the "Content-Length" header initially. This causes a HTTP 411
Length Required error to be returned by the server. With our users it
seems to be a problem with IIS 6.0 on Windows 2003. On Windows 2000,
IIS 5.0 responds with a challenge request and when the properly
authenticated request (e.g. PUT) is reissued it does contain the
"Content-Length" header and succeeds as expected.

We do not have enough knowledge of curl to propose a fix we are sure
would not break something else. But, we suspect these lines in http.c
introduce the problem:

       /* until the auth is done, pretend we only do GET */
       httpreq = HTTPREQ_GET;
       httpreq = data->set.httpreq;

This will cause the default case to be hit in the switch statement that
follows and since that case treats the request like a GET the header is
obviously not set.

Here is the curl log illustrating the error as reported by a user
(slightly censored):

* About to connect() to port 443
* Connected to ( port 443
* error setting certificate verify locations, continuing anyway:
* CAfile: /usr/local/share/curl/curl-ca-bundle.crt
   CApath: none
* SSL connection using RC4-MD5
* Server certificate:
* xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
* start date: 2003-08-14 23:30:43 GMT
* expire date: 2005-08-13 23:30:43 GMT
* xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
* SSL certificate verify result: 20, continuing anyway.
11D7-982F-000393A56668-RID%7D.eml HTTP/1.1
User-Agent: Snerdware Groupcal/1.0 (MSIE 6.0; Windows NT 5.1)
Pragma: no-cache

< HTTP/1.1 411 Length Required
< Content-Type: text/html
< Date: Thu, 18 Dec 2003 02:33:37 GMT
< Connection: close
< Content-Length: 24
* Closing connection #0

Thank you all in advance for your help with this matter.

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Received on 2003-12-18