Re: HTTP/2 deferring DATA frame to another TCP packet

From: Pontakorn Prasertsuk via curl-library <curl-library_at_lists.haxx.se>
Date: Wed, 21 Jun 2023 17:02:44 +0800

I tried running `SSLKEYLOGFILE=/tmp/sslkeylog.log src/curl --location "
https://localhost:8000" --insecure --http2 --data "1234567890" -H
"Content-type: text/plain" -v --no-tcp-nodelay`

The packet capture still shows the DATA frame separated from the HEADER
frame. The packet with (text/plain) is the body of the POST request:

[image: curl_no_tcp_nodelay.png]

Regards,
Pontakorn

On Wed, Jun 21, 2023 at 4:11 PM Daniel Stenberg <daniel_at_haxx.se> wrote:

> On Wed, 21 Jun 2023, Pontakorn Prasertsuk via curl-library wrote:
>
> > I have a POST body with length 10. The header `Content-length: 10` is
> > present in the HEADER frame of my request. Referring to the image, the
> POST
> > body is in the third packet after the HEADER packet (with SETTINGS
> packet
> > from server and ACK packet from the client in between). It should be
> > possible to fit the DATA frame into the first packet with the HEADER
> frame
> > but I cannot find a way to do it in libcurl.
>
> Maybe switching off TCP_NODELAY ?
>
> See this issue from a few years ago:
> https://github.com/curl/curl/issues/6363
>
> --
>
> / daniel.haxx.se
> | Commercial curl support up to 24x7 is available!
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Received on 2023-06-21