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I'm currently trying to set up a Reverse Proxy with Apache. I went with the following config:

<VirtualHost *:80>
  ServerName my-server

  SSLProxyEngine on
  SSLProxyVerify none 
  SSLProxyCheckPeerCN off
  SSLProxyCheckPeerName off
  SSLProxyCheckPeerExpire off

  ProxyPreserveHost on
  ProxyRequests off
  ProxyPass "/c/"  "https://other.server.com/"
  ProxyPassReverse "/c/"  "https://other.server.com/"

  ErrorLog ${APACHE_LOG_DIR}/error.log
  CustomLog ${APACHE_LOG_DIR}/access.log combined

</VirtualHost>

The problem I've encountered is that when I navigate to localhost:8080/c/slug/ it works as expected, yet when I navigate to localhost:8080/c/slug it redirects me to localhost:8080/slug instead of getting the content from the proxied server.

When inspecting the call headers I found a 301: Moved permanently.

HTTP headers

On the other hand, while inspecting the call that works, it all appears fine:

enter image description here

I've tried the following ideas, but none have happened to work:

RewriteRule

Adding a rewrite rule:

  RewriteEngine on
  RewriteRule "slug$" "slug/" [L,R=301]

Explicitly typing the URL

Explicitly typing the URL I'm trying to access without the forward slash:

  ProxyPass "/c/slug"  "https://other.server.com/"
  ProxyPassReverse "/c/slug"  "https://other.server.com/"

I have also tried turning on and off the ProxyRequests, but also didn't work.

Any help is appreciated.

6
  • ProxyPassReverse should be taking care of correctly rewriting HTTP redirect headers but will only rewrite a few specific ones (see httpd.apache.org/docs/2.4/mod/mod_proxy.html) so start by inspecting the headers you get when you access the URI without a trailing / - also including or omitting the trailing / in the ProxyPass directive should be the same on both the local path prefix and the remote URI – HBruijn Nov 21 '18 at 22:16
  • @HBruijn I inspected the headers, although I don't really understand the results. I added them to the question. Does the 301 tell you anything that might be going on? – Javier García Manzano Nov 22 '18 at 13:09
  • This is most probably a configuration issue on other.server.com, not your reverse proxy. Fetch https://other.server.com/slug and see what happens. – Gerald Schneider Nov 22 '18 at 13:14
  • The "moved permanently - from disk cache" shows at least one of your problems. A Permanent redirect (the result of your testing with [L,R=301] flags?) is exactly that: permanent and will be cached by a web browser. If you made a mistake and don't clear your caches (or don't do each new test in a new anonymous window) then any changes you make in the server configuration won't become apparent as your webbrowser will change the request for you even before it gets sent to a server. – HBruijn Nov 22 '18 at 13:22
  • @GeraldSchneider @HBruijn so I just went and checked the other.server.com and there is something fishy going on. It does deliver the content on both urls, both with and without the forward slash, but when I GET the content without the forward slash it does return a 301. Do you think this might have to do with my proxy returning that 301 and not displaying content? I have tested this on an anonymous window. – Javier García Manzano Nov 22 '18 at 13:26
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I had a similar problem, but in my case I was redirecting a VirtualHost from HTTP to a VirtualHost with HTTPS, and in my Redirect directive it was missing the final /.

For example: Redirect / https://localhost

And I solved with: Redirect / https://localhost/

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