Hi All,

Some more thoughts and questions on same:
For #1 case, may be its not logical to specify dependency on the handle
currently being setup.

Another concern is that of multiplexing streams. So when we support
HTTP/1.1 and HTTP/2 using same libcurl stack and same multi handle, how can
we specify CURLMOPT_MAX_TOTAL_CONNECTIONS & CURLMOPT_MAX_HOST_CONNECTIONS ?
If we specify CURLMOPT_MAX_HOST_CONNECTIONS > 1 and try to initiate
multiple HTTP/2 transfers, libcurl tries to open new connection instead of
reusing. As we need the option to be set of HTTP/1.1 also.
if(Curl_conncache_bundle_size(conn_temp) < max_host_connections &&
         Curl_conncache_size(data) < max_total_connections) {
        /* We want a new connection anyway */
        reuse = FALSE;

        infof(data, "We can reuse, but we want a new connection anyway\n");
        Curl_conncache_return_conn(conn_temp);
      }

Thanks,
Kunal

On Mon, Mar 18, 2019 at 1:01 PM Kunal Ekawde <kunalekawde_at_gmail.com> wrote:

> Hello Everyone,
>
> I'm trying HTTP/2 stream dependency transfers using libcurl 7.64.0 +
> nghttp2 1.36 with server-libmicrohttpd + nghttp2 - just echo no delay.
>
> I've used the example http2-download.c in libcurl
> Just added:
> curl_easy_setopt(easy[1], CURLOPT_STREAM_DEPENDS_E, easy[2]);
> curl_easy_setopt(easy[2], CURLOPT_STREAM_DEPENDS_E, easy[0]);
> before:
> curl_multi_setopt(multi_handle, CURLMOPT_PIPELINING, CURLPIPE_MULTIPLEX);
> /* we start some action by calling perform right away */
> curl_multi_perform(multi_handle, &still_running);
>
> I've also attempted these setting in setup function i.e before
> curl_multi_add_handle
>
> There 2 concerns here:
> 1. I'm not able to specify dependency on the stream/handle which is
> currently being setup. So basically, for 2 streams, I cannot set stream 1
> depends on stream 3, in pcap it show stream 1 depends on stream 0. Incase
> of above example, it shows, 3 exclusive depends on 0 and 5 exclusive
> depends on 1. Expectation is 3 exclusive depends on 5 and 5 exclusive
> depends on 1, like:
> 1
> 5
> 3
>
> 2. For Above example, out of 10 transfers,
> 2 transfers showed order(in pcap):
> HTTP2 768 HEADERS[5]: 200 OK, HEADERS[1]: 200 OK, HEADERS[3]: 200
> OK, DATA[5], DATA[1], DATA[3]
>
> 6 transfers showed order:
> HTTP2 765 HEADERS[1]: 200 OK, HEADERS[3]: 200 OK, HEADERS[5]: 200
> OK, DATA[1], DATA[3], DATA[5]
>
> 2 showed:
> 1, 5, 3
>
>
> Is this expected or is the way of setting the dependency incorrect?
>
> Thanks,
> ~Kunal
>

-- 
~Kunal

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Received on 2019-03-19