Re: [libmicrohttpd] Websockets?

[Christian Grothoff]

This has actually been on my "potential features" list for a little 
while.  The implementation is quite trivial; all that is really needed 
is some minor modification to the MHD_response internals / API to give 
the application a way to create a "websocket" response; that response 
would then send the HTTP "UPGRADE" header and the API would need to 
provide a mechanism to return the socket of the connection to the 
application.

So a clean implementation would require modifications to MHD (I don't 
see how it could be cleanly done with libwebsockets, other than by 
running a second HTTP-server on a different port, but that's not clean 
in my book); however, those modifications should be small and could be 
done in a backwards-compatible manner.

The one big major roadblock for implementing this in MHD is that this 
would be tricky to automatically (!) test any such implementation.  Last 
time I checked, libcurl did not have support for websockets, which means 
we could not use our usual approach of having a testcase with a libcurl 
<-> libmicrohttpd setup for testing.  And I am hesitant to add (even) 
more features without (good) testcases...

So if you have a *nice*, *free* C library for a websocket client that we 
could use here, that would be useful and might convince me to think 
harder about what the API should really look like ;-).  But it is 
already good to know that some of you are interested in this feature...

Happy hacking!

Christian

On 01/23/2012 05:54 PM, Jon Nalley wrote:
> After the 'Upgrade' request Websocket no longer uses HTTP.  You might be
> able to leverage libwebsockets
> <http://git.warmcat.com/cgi-bin/cgit/libwebsockets> in conjunction with
> libmicrohttpd.
>
> On Mon, Jan 23, 2012 at 10:45 AM, Sven Geggus
> <address@hidden <mailto:address@hidden>> wrote:
>
>     Hello,
>
>     looking for a way to get rid of my pseudo server push using delayed ajax
>     requests I came about the WebSocket-Protokoll.
>
>     Would it be possible to implement this using libmicrohttpd without
>     hacking
>     the core?
>
>     Sven
>
>     --
>     Das allgemeine Persönlichkeitsrecht (Art. 2 Abs.1 i.V.m. Art.1 Abs. 1GG)
>     umfasst das Grundrecht auf Gewährleistung der Vertraulichkeit und
>     Integrität
>     informationstechnischer Systeme. (BVerfG, 1BvR 370/07)
>     /me is address@hidden, http://sven.gegg.us/ on the Web