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Re: CURLOPT_WRITEFUNCTION callback not called when If-Modified-Since not obeyed

From: Daniel Stenberg <>
Date: Thu, 12 May 2011 23:08:41 +0200 (CEST)

On Thu, 12 May 2011, Steve Liao wrote:

> My application uses CURL_TIMECOND_IFMODSINCE. When the HTTP server returns
> a 304 in response to an HTTP GET in which the If-Modified-Since header is
> the same time as the last modification time of the file, things are fine.
> However, when an HTTP server that doesn't obey that header returns a 200
> response and provides the file content, the callback registered against
> CURLOPT_WRITEFUNCTION doesn't get called even though there is file content.
> This behavior is observed on libcurl 7.21.6. When the application is built
> against libcurl 7.17.1, this beahavior doesn't show up - the callback
> registered against CURLOPT_WRITEFUNCTION gets called.

So what's the full set of request headers in the libcurl request and response
headers from the server?

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Received on 2011-05-12