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Editorial Team
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Asked: 2026-05-25T12:23:53+00:00

Is there anything in the Servlet spec, Tomcat, or Wicket that will allow a

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Is there anything in the Servlet spec, Tomcat, or Wicket that will allow a webapp running behind mod_proxy to determine the non-proxied URL of the request?

We need to send out emails with links in them. I had been using the following bit of Wicket to construct URLs to specific pages in the app:

String relURL = RequestCycle.get().getRequest().getRelativePathPrefixToWicketHandler();
RequestUtils.toAbsolutePath(relURL);

Since the emails don’t go back out through the proxy, of course the URLs don’t get re-written, and end up looking like http://localhost/....

Right now the best I can do is to hard-code the URLs to our production server, but that’s setting us up for some debugging headaches when running on dev/test machines.

Using InetAddress.getLocalHost().getHostName() isn’t really a solution, since that’s likely to return prod1.mydomain.com or somesuch, rather than mydomain.dom, from which the request likely originated.

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1 Answer

  1. Editorial Team

    As answered for the question Retain original request URL on mod_proxy redirect:

    If you’re running Apache >= 2.0.31 then you might try to set the
    ProxyPreserveHost directive as described here .

    This should pass the original Host header trough mod_proxy into your
    application, and normally the request URL will be rebuild there (in
    your Servlet container) using the Host header, so the schema location
    should be build using the host and path infos from “before” the proxy.

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