Re: [WIP PATCH 00/14] Protocol v2 patches

[David Turner <dturner@twopensource.com>]

On Wed, 2016-05-25 at 06:03 +0700, Duy Nguyen wrote:
> On Wed, May 25, 2016 at 5:46 AM, David Turner <
> dturner@twopensource.com> wrote:
> > I was looking at this again today, and noticed that it doesn't
> > really
> > address the HTTP case.
> > 
> > The central problem is that protocol v2 goes like this:
> > server: I have capabilities w,x,y, and z
> > client: I want capabilities x and z.
> > 
> > But HTTP goes like this:
> > client: [request]
> > server: [response]
> > 
> > I tried to make libcurl do the receive-before-sending thing, but it
> > doesn't seem to be designed for it (even if you prime things by
> > sending
> > a "hello" from the client first).  My thought was to hook up
> > CURLOPT_READFUNCTION and CURLOPT_WRITEFUNCTION, and have the read
> > function return CURL_READFUNC_PAUSE and then have the write
> > (=client
> > receiving data ) function unpause the reader (= client sending
> > data)
> > once it gets the capabilities.  But apparently pausing only works
> > with
> > chunked encoding, which seems to cause Apache's mod_cgi to fail.
> > 
> > Maybe I'm missing something.  Has anyone else ever made something
> > like
> > this work?
> 
> It simply takes one more round-trip to negotiate. Not the best thing,
> but...

Do you mean that it can be done with libcurl?  Or do you mean that I
should go with the /capabilities endpoint?