mod_rewrite：将路径和查询字符串URL作为参数传递

Question

I'm using mod_rewrite to rewrite pretty URLs to a form supported by a Spring 2.5 application.

e.g. /category/cat1?q=x   =>  /controller?category=cat1&q=x

However from my controller I want to know the original URL the request came from (so I can generate a link if required). This approach is needed generically across all pages so it is difficult to hard code.

How can I access the original path + query string from my controller?

I have tried using $0 to include the full path but this doesn't include the query string. I can't just append the path and the query string as this would result in some parts of the path being added as parameters /category/cat1?category=cat1&q=x Note the addition of the unwanted &category=cat1 parameter, this causes the URL to no longer match that sent from the browser.

I'm hoping mod_rewrite will let me reference the full URL and encode it as a parameter so my rule could look like:

RewriteRule /category/(.+)
            /controller?category=$1&_originalUrl=${escape:$0}?${escape:<original query string>}
            [QSA]

Using my original example the end result passed through to my controller would be:

/controller?category=cat1&_originalUrl=%2Fcategory%2Fcat1%3Fsearch%3Dx&search=x

The important part is the value of &_originalUrl which should be %2Fcategory%2Fcat1%3Fsearch%3Dx which in its unescaped version is /category/cat1?q=x (the original request URL that was sent from the browser).

Any suggestions welcome, thanks in advance!

Answer 1

The query can ony be tested with RewriteCond since RewriteRule does only test the URL path . See Jonathan Feinberg's example how to do that.

But you could also just set the QSA flag and the old query gets automatically appended to the new one:

RewriteRule ^/category/([^/]+)$ /controller?category=$1 [QSA]

---

Edit In response to your comment to this question: If you want to get the initial requested URI path and query, you need to extract it from the request line ( THE_REQUEST variable):

RewriteCond %{THE_REQUEST} ^[A-Z]+\ ([^\s]+)
RewriteRule ^/category/([^/]+)$ /controller?category=$1&_originalUrl=%1 [QSA]

But in most languages there is an environment variable with the very same information.

Answer 2

You have to capture the query string in an initial, separate step.

RewriteCond %{query_string} ^q=([^&]+)
RewriteRule ^/category/(cat1)$ /controller?category=$1&q=%1

etc.

Answer 3

Is there a host header you can use? Sorry for being so vague, but last time I had to do this was using PHP (urgh, dont ask), and I think thats how we did it - eg REQUEST_URI ( http://www.askapache.com/htaccess/mod_rewrite-variables-cheatsheet.html )

You also may be able to SET a host header in the rewrite ( http://httpd.apache.org/docs/2.0/mod/mod_rewrite.html )

eg:

ReWriteRule /category/(cat1)?q=(x) /controller?category=$1&q=$2 [E=FOO:....]

(and no, I'm so totally NOT a mod-rewrite ninja)