[curl/curl] ee97f1: schannel: set ALPN length correctly for HTTP/2

Joel Depooter <[email protected]> Wed, 26 May 2021 23:28:46 -0700

Newsgroups	gmane.comp.web.curl.cvs
Message-ID	<curl/curl/push/refs/heads/master/[email protected]>

  Branch: refs/heads/master
  Home:   https://github.com/curl/curl
  Commit: ee97f176970c9667bfbdaab89bc637e77099d1df
      https://github.com/curl/curl/commit/ee97f176970c9667bfbdaab89bc637e77099d1df
  Author: Joel Depooter <[email protected]>
  Date:   2021-05-27 (Thu, 27 May 2021)

  Changed paths:
    M lib/vtls/schannel.c

  Log Message:
  -----------
  schannel: set ALPN length correctly for HTTP/2

In a3268eca792f1 this code was changed to use the ALPN_H2 constant
instead of the NGHTTP2_PROTO_ALPN constant. However, these constants are
not the same. The nghttp2 constant included the length of the string,
like this: "\x2h2". The ALPN_H2 constant is just "h2". Therefore we need
to re-add the length of the string to the ALPN buffer.

Closes #7138


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