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*) mod_http2: added support for bootstrapping WebSockets via HTTP/2, as described in RFC 8441. A new directive 'H2WebSockets on|off' has been added. The feature is by default not enabled. As also discussed in the manual, this feature should work for setups using "ProxyPass backend-url upgrade=websocket" without further changes. Special server modules for WebSockets will have to be adapted, most likely, as the handling if IO events is different with HTTP/2. HTTP/2 WebSockets are supported on platforms with native pipes. This excludes Windows. New directive `H2ProxyRequests on|off` to enable handling of HTTP/2 requests in a forward proxy configuration. General forward proxying is enabled via `ProxyRequests`. If the HTTP/2 protocol is also enabled for such a server/host, this new directive is needed in addition. git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1911979 13f79535-47bb-0310-9956-ffa450edef68