t/lib-httpd: enable HTTP/2 "h2" protocol, not just h2c

Commit 73c49a4 (t: run t5551 tests with both HTTP and HTTP/2,
2022-11-11) added Apache config to enable HTTP/2. However, it only
enabled the "h2c" protocol, which allows cleartext HTTP/2 (generally
based on an upgrade header during an HTTP/1.1 request). This is what
t5559 is generally testing, since by default we don't set up SSL/TLS.

However, it should be possible to run t5559 with LIB_HTTPD_SSL set. In
that case, Apache will advertise support for HTTP/2 via ALPN during the
TLS handshake. But we need to tell it support "h2" (the non-cleartext
version) to do so. Without that, then curl does not even try to do the
HTTP/1.1 upgrade (presumably because after seeing that we did TLS but
didn't get the ALPN indicator, it assumes it would be fruitless).

Signed-off-by: Jeff King <[email protected]>
Signed-off-by: Junio C Hamano <[email protected]>

Author: peff

t/lib-httpd/apache.conf

@@ -31,7 +31,7 @@ ErrorLog error.log
 
 <IfDefine HTTP2>
 LoadModule http2_module modules/mod_http2.so
-Protocols h2c
+Protocols h2 h2c
 </IfDefine>
 
 <IfVersion < 2.4>