How can I proxy a query string URL in Apache?

Question

I'm trying to get an older Apache (2.2.17) to proxy:

http://foo.com/proxy/?url=http%3A%2F%2Fbar.com%2foo

to:

I have:

RewriteCond %{QUERY_STRING} ^url=(.*)$
RewriteRule ^/proxy/ %1? [P,L]

Unfortunately, this results in Apache trying to proxy the URL-encoded value (log output) :

(3) applying pattern '^/proxy/' to uri '/proxy/'
(4) RewriteCond: input='url='http%3A%2F%2Fbar.com%2foo'' pattern='^url=(.*)$' => matched
(2) rewrite '/proxy/' -> ''http%3A%2F%2Fbar.com%2foo'?'
(3) split uri='http%3A%2F%2Fbar.com%2foo'? -> uri='http%3A%2F%2Fbar.com%2foo', args=
(2) forcing proxy-throughput with http://foo.com/'http%3A%2F%2Fbar.com%2foo'
(1) go-ahead with proxy request proxy:http://foo.com/'http%3A%2F%2Fbar.com%2foo' [OK]

So, it appears there are two problems. One is that there are apostrophes in the result and the other is that the result is not URL decoded. I assume the reason Apache is prepending the original protocol://host is that it doesn't see the result as an URL.

Jon Lin · Accepted Answer · 2012-09-14 00:06:53Z

3

If you have access to vhost/server config (and it looks like you do), you can configure one of apache's built in rewrite maps to unescape for you:

RewriteMap unescape int:unescape

Then you can use the map in your rules:

RewriteCond %{QUERY_STRING} ^url=(.*)$
RewriteRule ^/proxy/ ${unescape:%1}? [P,L]

answered Sep 14, 2012 at 0:06

Jon Lin

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2 Comments

Jay Vachhani Over a year ago

This fixed the URL-decoding problem. I'm now getting: foo.com/'http://bar.com/foo' How do I get rid of the apostrophes and get it to proxy the real URL?

Jon Lin Over a year ago

@JayVachhani that shouldn't be there at all, this works for me in my apache install. Unless there's ' around the url in the query string, I guess you can get rid of those optionally by changing the regex to: ^url='?(.*?)'?$

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