Is it possible to use mod_proxy in front of an Apache Tomcat 8.5 with the http2 protocol? If yes it would be nice to see an example configuration.


Specifically: Is it possible and recommended to use http2 between the client and the server (Apache httpd), and continue the data stream with ajp between Apache httpd and Apache Tomcat?

Edit 2

This answer provides some details about the topic:



Apache httpd added HTTP/2 proxy support from 2.4.21 but suggest you run latest (2.4.27 at time of writing) as this module is still changing quite a bit at the moment.

Tomcat has just added HTTP/2 support in Tomcat 9: https://readlearncode.com/configure-tomcat-9-for-http2/

So in theory this should all fit together nicely if you're willing to upgrade to those versions (and install OpenSSL 1.0.2 or above required for HTTP/2).

However, in practice it's still all very new, so bugs are possible. To be perfectly honest, the biggest gains from HTTP/2 are with higher-latency connections like client-to-server. Server-to-server connections like Apache to Tomcat using mod_proxy will see fewer gains.

So, given how new these are, you may wish to just use HTTP/2 on your Apache web server (or any other web server which supports HTTP/2), and use mod_proxy to connect to Tomcat via HTTP/1.1 or AJP. This will give you most of the performance gains of HTTP/2 without the hassle and risk of upgrading everything to get full end-to-end HTTP/2.


As of July 2017, Apache mod_proxy doesn't support HTTP/2.0 protocol. There is a mod_proxy_http21 module but it is still experimental.

Like detailed in the StackOverflow answer provided in the second edit, you could use mod_http2 to enable HTTP/2.0 support on Apache side, and communicate back to the Tomcat server either with HTTP/1.1 or AJP. But you would loose one of HTTP/2.0 biggest feature: multiplexing.

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.