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schannel: set ALPN length correctly for HTTP/2

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In a3268eca79 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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Joel Depooter 2021-05-26 18:33:34 -07:00 • committed by Daniel Stenberg
parent 5f7fef70a9
commit ee97f17697
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lib/vtls/schannel.c
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@ -874,6 +874,7 @@ schannel_connect_step1(struct Curl_easy *data, struct connectdata *conn,
#ifdef USE_HTTP2
if(data->state.httpwant >= CURL_HTTP_VERSION_2) {
alpn_buffer[cur++] = ALPN_H2_LENGTH;
memcpy(&alpn_buffer[cur], ALPN_H2, ALPN_H2_LENGTH);
cur += ALPN_H2_LENGTH;
infof(data, "schannel: ALPN, offering %s\n", ALPN_H2);