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Asked: 2017-10-21 00:33:50 +0800 CST

How to replace part of a URL request before proxying in apache 2.4?

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I am trying to re-write part of a URL (https://myfirstdomain.com/lool/https:/alf.mydomain.com/service/wopi/files/uuid?query_params) before the proxying takes place and I have this relevant section in my default SSL vhost:

 <IfModule mod_rewrite.c>
    RewriteEngine   On
    LogLevel debug rewrite:trace3

    RewriteRule ^lool/https:/alf.mydomain.com\/(.*) lool/https://alf.mydomain.com/$1 [QSA,NE]
</IfModule>

ProxyPass               /       https://localhost:2323/
ProxyPassReverse        /       https://localhost:2323/

and I see this in the re-write logs:

applying pattern '^lool/https:/alf.mydomain.com' to uri '/lool/https:/alf.mydomain.com/service/wopi/files/uuid

but on the service that receives this I see that the URL hasn't been re-written. Would be grateful for any clues as to what I am doing wrong. I am essentially trying to add the extra / that has been removed by a proxy server somewhere in the infrastructure that I do not have access to.

EDIT: in the logs for the backend WOPI service, it sees the request URL un-modified:

Request from 127.0.0.1:42035: GET /lool/https:/alf.mydomain.com/service/wopi/files/uuid
apache-2.4

1 Answers

  1. Best Answer
    RewriteRule ^lool/https:/alf.mydomain.com\/(.*) lool/https://alf.mydomain.com/$1 [QSA,NE]

    When used in a virtual host context, the RewriteRule pattern matches the full URL-path, including the slash prefix (this is only removed in a directory context).

    Try something like the following instead:

    RewriteRule ^/lool/https:/(alf\.mydomain\.com/.*) /lool/https://$1 [PT,NE]

    The slash prefix is also required on the substitution when used in a virtual host context, in order to specify a document-root relative URL-path.

    I've just extended the captured pattern to include the hostname to save repetition in the substitution.

    Literal dots should be escaped in the RewriteRule pattern. Whereas slashes (/) do not need to be escaped.

    The QSA flag is superfluous here since you aren't specifying a query string on the substitution.

    You may or may not need the PT (passthrough) flag in order to get this picked up by mod_proxy.

    You should also remove the <IfModule mod_rewrite.c> wrapper - unless this is intended to work without mod_rewrite? Otherwise, you'll just mask an errors when mod_rewrite is not available.

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