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From Stefan Eissing <>
Subject Re: [users@httpd] Mod_proxy_http2 - got a 503
Date Sat, 17 Jun 2017 16:54:09 GMT

do you talk http: or https: to the backend? h2://mybackend is for the SSL case, for unencrypted
calls, use h2c://mybackend.

Maybe that is the problem?


> Am 17.06.2017 um 15:26 schrieb Olivier Mallassi <>:
> Hello all
> We are trying to use the mod_proxy_http2 of httpd. Our use case is for now "simple"
> - multiple backedns (configured in HTTP2)
> - one httpd acting as proxy 
> -- mod_proxy_http2 is activated
> -- we use the Balancer directive to load balanced accross backends (round-robin)
> - the client is a curl -kv --http2 ...
> The tests are the following:
> - while using curl to access one of the backend directly, the access log shows that we
use HTTP/2
> - then the balancer directive is configured with http://mybackend1
> In taht case, while accessing to the proxy with curl, we see that the communication between
curl & httpd is HTTP/2 but that the communication with the backends is HTTP1/1
> - then we change the balancer directive to h2://mybackend.... 
> In that case, the curl returns 503 (like if the proxy is unable to route). 
> I suspect a misconfiguration but any help is welcomed. Does someone already did something
> thanks. 

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