cURL / Mailing Lists / curl-library / Single Mail


Re: Is there an easy way to separate request / response processing with libCurl?

From: Daniel Stenberg <>
Date: Fri, 27 Jan 2012 22:20:06 +0100 (CET)

On Fri, 27 Jan 2012, wrote:

> So my question.  Is there a simple way to split the sending of the HTTP
> requests and the processing of the responses on a per connection basis using
> libCurl?

I don't quite understand why you'd even want that? In HTTP you can very well
start receiving data before you've completed sending your request, they're
not easily separatable.

> I've looked at the one multi-socket example that I found but it seems a bit
> more complex than what I was looking for, and it sounds like when the
> curl_multi_socket_action() function is called that it will process any
> connections that are pending in the multi handle, and we need to track each
> individual connection that is processed for context.

The multi-socket API is perfect if you want to use an event-based driven
application. If you "just" want non-blocking selcet() style, I suggest you use
curl_multi_perform() instead.

> Is there another multi example available that would be closer to what we
> need to do?  I've done some searching with Google but haven't turned up very
> much yet.

This example: makes a simple
multi interface application. All you need is to add CURLOPT_POSTFIELDS or
similar to do the post. If you rather do multipart formposting there's a
better example in

> I suspect that I could use the easy read callback to do the context
> processing for each response received, so I might revisit it looking at that
> approach.

Yes you should! How else would you do it? I figure you can also store the
response in a file and wait until the entire thing has been received and then
handle it - it's really up to you, libcurl provide the means and you can
decide which way to do it.


List admin:
Received on 2012-01-27