Added more details to mod-proxy-http2's doc
have to be present in the server.</p>
<p><module>mod_proxy_http2</module> works with incoming requests
- over HTTP/1.1 and HTTP/2 requests. If <module>mod_http2</module>
- handles the frontend connection, requests against the same HTTP/2
- backend are sent over a single connection, whenever possible.</p>
+ over HTTP/1.1 and HTTP/2 requests. In both cases, requests proxied
+ to the same backend are sent over a single connection
+ whenever possible (namely when the connection can be re-used).</p>
+
+ <p><module>mod_proxy_http2</module> will not use the HTTP/2 protocol
+ when the frontend requests use HTTP/1.1.
+ This means that HTTP/2 will be used to proxy requests to a capable backend
+ only when the frontend requests use the same protocol.</p>
<p>This module relies on <a href="http://nghttp2.org/">libnghttp2</a>
to provide the core http/2 engine.</p>
