[Libwebsockets] multiple clients with http body using http persistent connection (PIPELINE)

dev akira akira.pp.dev at gmail.com
Tue Jan 28 13:06:19 CET 2020

Hello Andy,

Thank you for your quick answer!

The sample codes helped me a lot to understand how to use libwebsockets and
it would be helpful if you add an option to send http body to the
http-client-multi example.

Thank you,

2020年1月28日(火) 20:32 Andy Green <andy at warmcat.com>:

> On 1/28/20 11:19 AM, dev akira wrote:
> > Hello,
> >
> > I would like to make multi clients connect a server (with the same
> > address and port), sequentially with multiple paths and methods. I can
> > implement the code but every client setup it's own tcp connection (and
> > tls tunnel). Now, I would like to make a http persistent connection
> > using a single tcp connection (and a single tls tunnel).
> >
> > I tried LCCSCF_PIPELINE but did not work when the clients has http body.
> It's the correct way for either h1 or h2, if the problem is coming when
> sending a POST body or whatever it sounds like a bug.
> > For example, when I make a http request with http body using
> > lws_client_connect_via_info(). This generates a wsi (1) and complets
> > client http. Then, make a second http with http body using
> > lws_client_connect_via_info(). This generates another wsi (2) but
> > results in "lws_callback_on_writable(): failed to find socket -1" and
> > cannot make the callback function called with
> > LWS_CALLBACK_CLIENT_HTTP_WRITEABLE(57) to send http body.
> >
> > I searched libwebsockets docs, sample codes, mailinglist but cannot find
> it.
> This is the example used to confirm the connection binding
> https://libwebsockets.org/git/libwebsockets/tree/minimal-examples/http-client/minimal-http-client-multi
> it runs with various options during CI tests for each push.  But it
> doesn't support testing with POST atm.
> > <<< call lws_client_http_body_pending(wsi, 1)  in callback function
> Right...
> I think the best move is I'll add an option for this kind of behaviour
> to the http-client-multi example and see what happens.  Broadly the
> connections are doing the same thing as if they are standalone, but
> there are some differences, if there's a bug it's probably related to that.
> -Andy
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