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Reply to topic   Topic: Using <Location> but excluding some sites / pages

Joined: 22 Jan 2023
Posts: 23
Location: USA, Wilkesboro

PostPosted: Fri 22 Dec '23 7:32    Post subject: Using <Location> but excluding some sites / pages Reply with quote

I'm playing around with mod_substitute. This is my sandbox script:

<Location "/">
 AddOutputFilterByType SUBSTITUTE text/html
 Substitute "s|(<body.*?>)|<script>var foo = 1, bar = 14;</script><script src="//example.com/lorem.js"></script>\n$1|iq"

Or possibly reversing that and placing $1 before <script>. Either way, my plan is to place this in the /etc/apache2/conf.d/userdata directory, so that it applies to all of the sites on the server.

Now I have 2 modifications that I'd like to consider:

1. Let's say that I want to explicitly exclude certain websites. This would be easier than manually including sites, since I expect 190 out of 200 of them to use this. What is the best way to exclude them from the substitution, other than manually typing 190 of them into an <If> (and then modifying it every time I add a site)? Is it possible to enter a TXT record to their DNS, and then have Apache read that TXT record?

2. Let's say that I have a website that I want to use the substitution, but I have certain pages in that site that I want to exclude. The URLs are auto-generated, so there's nothing in the address that I could use to automatically know that it should be excluded; eg,


If it helps, the pages are written in PHP and select from MySQL, and if the results of that query contain certain predefined words or phrases then they plug in a custom header:

header('X-Foo: true');

But it's my understanding that <Location> runs before that, so I don't think that would be helpful.

Any other suggestions on how I might exclude those pages from the substitution?

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James Blond

Joined: 19 Jan 2006
Posts: 7329
Location: Germany, Next to Hamburg

PostPosted: Wed 27 Dec '23 17:41    Post subject: Reply with quote

Possible solution are using mod_macro[1] or using the IF statement [2]

[1] https://httpd.apache.org/docs/2.4/mod/mod_macro.html
[2] https://httpd.apache.org/docs/2.4/mod/core.html#if
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