[Libevent-users] Re: libevent: HTTP POST service example?

[Basile Starynkevitch <basile@xxxxxxxxxxxxxxxxx>]

On Fri, 5 Nov 2010 23:58:47 +0100
Basile Starynkevitch <basile@xxxxxxxxxxxxxxxxx> wrote:
> Do you have an example of an HTTP server in libevent which handles a
> POST request?
> 
> Apparently, calling evbuffer_readline (hreq->input_buffer); from inside
> a callback registered with evhttp_set_cb don't work as expected.

In fact, the POST-ed data is available with EVBUFFER_LENGTH
(req->input_buffer) & EVBUFFER_DATA(req->input_buffer) as tge
regress_http.c test example shows. But this is not well documented, and
perhaps might not work for big data.

Of course, in the usual case, the POST-ed data is coming from
submitting an HTML form, so its Content-type is
"application/x-www-form-urlencoded" and the application has to decode
that.

What I don't know is what happens when the web client (e.g. some
Firefox browser in my case) sends the data in several write(2) or send
(2) system calls. This probably could happen (I suppose) when the data
is large enough (e.g >10kbytes), as could be the case when a TEXTAREA
HTML element is implied.

In that case, I don't understand if the libevent is buffering the
entire HTTP request (so that the HTTP callback is always called once,
after all the buffering succeeded) or not.

Cheers.

-- 
Basile STARYNKEVITCH         http://starynkevitch.net/Basile/
email: basile<at>starynkevitch<dot>net mobile: +33 6 8501 2359
8, rue de la Faiencerie, 92340 Bourg La Reine, France
*** opinions {are only mine, sont seulement les miennes} ***
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