On 9 March 2015 at 00:12, Thrawn <[email protected]> wrote: > Hi, all. > > Is there a way to share configuration between multiple backends? > > The use case for this is that we would like to configure different response > headers for different parts of our application, based on the request URL, but > otherwise route traffic the same way. Specifically, we want to specify > 'X-Frame-Options: ALLOW-FROM <some site>' across most of the application, but > just use 'X-Frame-Options: DENY' on the admin area. > > We could do this, of course, by sending the admin traffic to a different > backend, and setting the response header differently in that backend, but > then we'd need to repeat our server configuration, hich is otherwise the > same. Something like this: > > frontend foo > listen x.x.x.x > acl admin url_beg /admin > default_backend foo > use_backend foo_admin if admin > > backend foo > rspadd "X-Frame-Options: ALLOW-FROM some-trusted-server.com" > <potentially > complex > configuration > goes > here> > > backend foo_admin > rspadd "X-Frame-Options: DENY" > <same > configuration > goes > here> > > To reduce the duplication, is it possible to have one backend delegate to > another, or specify a named list of servers that can be referenced from > different places?
I don't know about your specific *question*, but to solve your specific *problem*, you might just use rspadd's conditional form: frontend foo acl admin url_beg /admin rspadd "X-Frame-Options: DENY" if admin rspadd "X-Frame-Options: ALLOW-FROM some-trusted-server.com" unless admin default_backend whatever As per https://cbonte.github.io/haproxy-dconv/configuration-1.5.html#rspadd. Dictated but not tested ;-) Jonathan
