# Having trouble understand how rewrite works **URL:** \ **Category:** NGINX\ **Created:** [October 19, 2011, 5:53pm UTC](https://www.ruby-forum.com/t/having-trouble-understand-how-rewrite-works/212976 "2011-10-19T17:53:31Z")\ **Posts on this page:** 10\ **Page:** 1
**Author:** ![dubstep](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/d/cdc98d/32.png) [@dubstep](https://www.ruby-forum.com/u/dubstep)\ **Post date:** [October 19, 2011, 5:53pm UTC](https://www.ruby-forum.com/t/having-trouble-understand-how-rewrite-works/212976/1 "2011-10-19T17:53:31Z")
Here’s a small sample that is not working: server { # /index.cfm?PageID=1 → / location ^~ /index.cfm?PageID=1$ { rewrite ^ / permanent; } ``` location / { try_files $uri @django; } location @django { proxy_redirect off; proxy_set_header Host $host; proxy_set_header X-Real-IP $remote_addr; proxy_set_header X-Forwarded-For ``` $proxy\_add\_x\_forwarded\_for; ``` include uwsgi_params; if (!-f $request_filename) { uwsgi_pass staging; break; } } ``` } It seems like the first directive is ignored when I request /index.cfm?PageID=1. The idea is to redirect some old links. Thanks – Victor Noagbodji [http://www.victorsreviews.com](http://www.victorsreviews.com) ---
**Author:** ![victor](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/v/3e96dc/32.png) [@victor](https://www.ruby-forum.com/u/victor)\ **Post date:** [October 19, 2011, 6:28pm UTC](https://www.ruby-forum.com/t/having-trouble-understand-how-rewrite-works/212976/2 "2011-10-19T18:28:10Z")
19.10.2011, 22:53, “victor” [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid): > Here’s a small sample that is not working: > > server { > > # /index.cfm?PageID=1 → / - location ^~ /index.cfm?PageID=1$ { - rewrite ^ / permanent; - location = /index.cfm { - ``` if ($arg_PageID = 1) { ``` - ``` return 301 /; ``` - ``` } ``` - try\_files $uri @django; > proxy\_set\_header X-Forwarded-For $proxy\_add\_x\_forwarded\_for; > > include uwsgi\_params; - ``` # 'if' is useless here ``` - if (!-f $request\_filename) { > uwsgi\_pass staging; - break; - } > [http://www.victorsreviews.com](http://www.victorsreviews.com) > > * * * > > nginx mailing list > [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) > [mailman.nginx.org archive](http://mailman.nginx.org/mailman/listinfo/nginx) – br, Denis F. Latypoff. ---
**Author:** ![victor](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/v/3e96dc/32.png) [@victor](https://www.ruby-forum.com/u/victor)\ **Post date:** [October 19, 2011, 6:33pm UTC](https://www.ruby-forum.com/t/having-trouble-understand-how-rewrite-works/212976/3 "2011-10-19T18:33:46Z")
Hi Dennis, Thanks for your help, If I understand correctly, I need to use $arg\_PARAMS. But in the full source, I have expressions like this one: /index.cfm?PageID=(2|46)&(.\*)$ how do I deal with them in that case, if I can’t use regex on the query parameters? Thanks 2011/10/19 Denis F. Latypoff [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid): > - > > ``` > } > > ``` > > > proxy\_set\_header X-Real-IP $remote\_addr; > > > > nginx mailing list > > [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) > > [mailman.nginx.org archive](http://mailman.nginx.org/mailman/listinfo/nginx) > > – > br, Denis F. Latypoff. > > * * * > > nginx mailing list > [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) > [mailman.nginx.org archive](http://mailman.nginx.org/mailman/listinfo/nginx) – Victor Noagbodji [http://www.victorsreviews.com](http://www.victorsreviews.com) ---
**Author:** ![victor](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/v/3e96dc/32.png) [@victor](https://www.ruby-forum.com/u/victor)\ **Post date:** [October 19, 2011, 6:38pm UTC](https://www.ruby-forum.com/t/having-trouble-understand-how-rewrite-works/212976/4 "2011-10-19T18:38:05Z")
19.10.2011, 23:32, “victor” [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid): > Hi Dennis, > > Thanks for your help, > > If I understand correctly, I need to use $arg\_PARAMS. But in the full > source, I have expressions like this one: > > /index.cfm?PageID=(2|46)&(.\*)$ map $arg\_PageID $is\_old { default 0; 2 1; 46 1; } server { location = /index.cfm { if ($is\_old) { return 301 /; } # regular rules } } > > > include uwsgi\_params; > > > > – > > * * * > > nginx mailing list > [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) > [mailman.nginx.org archive](http://mailman.nginx.org/mailman/listinfo/nginx) – br, Denis F. Latypoff. ---
**Author:** ![victor](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/v/3e96dc/32.png) [@victor](https://www.ruby-forum.com/u/victor)\ **Post date:** [October 19, 2011, 6:40pm UTC](https://www.ruby-forum.com/t/having-trouble-understand-how-rewrite-works/212976/5 "2011-10-19T18:40:34Z")
Sorry, index.cfm, of course, not index.php. Andrejs Posted at Nginx Forum: > **[Re: Having trouble understand how rewrite works](https://forum.nginx.org/read.php?2,216917,216923#msg-216923)** > > Here's a small sample that is not working: server { # /index.cfm?PageID=1 --\> / location ^~ /index\\.cfm\\?PageID=1$ { rewrite ^ / permanent; } location / { try\_files $uri @djang ---
**Author:** ![victor](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/v/3e96dc/32.png) [@victor](https://www.ruby-forum.com/u/victor)\ **Post date:** [October 19, 2011, 6:51pm UTC](https://www.ruby-forum.com/t/having-trouble-understand-how-rewrite-works/212976/6 "2011-10-19T18:51:43Z")
Thanks again. I understand the map solution. Here’s another issue, you see, the links below all map to the index page (there are other pages too, that have those PageID, ParentPageID, etc.. parameters). /index.cfm?PageID=1 /index.cfm?resetCache=yes /index.cfm?PageID=1&ParentPageID=1&NavID=1 /index.cfm?PageID=22&ParentPageID=1&NavID=22 /index.cfm?PageID=14&ParentPageID=38&NavID=38&ReferringPage=1 all map to / (index) /index.cfm?PageID=35&ParentPageID=26&NavID=26 /index.cfm?PageID=35&ParentPageID=26&NavID=35&ProductID=8&PageText=off /index.cfm?PageID=35&ParentPageID=26&NavID=35&ProductID=9&PageText=off /index.cfm?PageID=35&ParentPageID=26&NavID=35&ProductID=10&PageText=off /index.cfm?PageID=35&ParentPageID=26&NavID=35&ProductID=15&PageText=off /index.cfm?PageID=35&ParentPageID=26&NavID=35&ProductID=16&PageText=off /index.cfm?PageID=35&ParentPageID=26&NavID=35&ProductID=11&PageText=off and these for example would map to another unique page. The parameters specify the actual page that must be mapped to. And since I now know I can’t use regex on query parameters, is there a way to handle this situation? Thanks On Wed, Oct 19, 2011 at 12:40 PM, locojohn [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) wrote: > – Victor Noagbodji [http://www.victorsreviews.com](http://www.victorsreviews.com) ---
**Author:** ![victor](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/v/3e96dc/32.png) [@victor](https://www.ruby-forum.com/u/victor)\ **Post date:** [October 19, 2011, 6:51pm UTC](https://www.ruby-forum.com/t/having-trouble-understand-how-rewrite-works/212976/7 "2011-10-19T18:51:43Z")
Thanks, Please see reply to Denis. On Wed, Oct 19, 2011 at 12:40 PM, locojohn [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) wrote: > – Victor Noagbodji [http://www.victorsreviews.com](http://www.victorsreviews.com) ---
**Author:** ![victor](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/v/3e96dc/32.png) [@victor](https://www.ruby-forum.com/u/victor)\ **Post date:** [October 19, 2011, 6:39pm UTC](https://www.ruby-forum.com/t/having-trouble-understand-how-rewrite-works/212976/8 "2011-10-19T18:39:57Z")
Hi! Arguments cannot be checked with location directive. Put the below code into your main server {} block, for example, before declaring any of the locations: ``` if ($request_uri ~ ^/index\.php\?PageID=1$) { rewrite ^ /? permanent; } ``` Andrejs Posted at Nginx Forum: > **[Re: Having trouble understand how rewrite works](https://forum.nginx.org/read.php?2,216917,216922#msg-216922)** > > Here's a small sample that is not working: server { # /index.cfm?PageID=1 --\> / location ^~ /index\\.cfm\\?PageID=1$ { rewrite ^ / permanent; } location / { try\_files $uri @djang ---
**Author:** ![victor](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/v/3e96dc/32.png) [@victor](https://www.ruby-forum.com/u/victor)\ **Post date:** [October 20, 2011, 2:20am UTC](https://www.ruby-forum.com/t/having-trouble-understand-how-rewrite-works/212976/9 "2011-10-20T02:20:49Z")
On 19 Out 2011 17h51 WEST, [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) wrote: > all map to / (index) > Taking the lead from Denis, try: map $request\_uri $is\_old { default 0; ~/index.cfm?PageId=\d+ 1; ~/index.cfm?PageID=\d+&ParentPageID=\d+&NavID=\d+ 1; ~/index.cfm?PageID=\d+&ParentPageID=\d+&NavID=\d+&ReferringPage=\d+ 1; } > /index.cfm?PageID=35&ParentPageID=26&NavID=26 > /index.cfm?PageID=35&ParentPageID=26&NavID=35&ProductID=8&PageText=off > /index.cfm?PageID=35&ParentPageID=26&NavID=35&ProductID=9&PageText=off > /index.cfm?PageID=35&ParentPageID=26&NavID=35&ProductID=10&PageText=off > /index.cfm?PageID=35&ParentPageID=26&NavID=35&ProductID=15&PageText=off > /index.cfm?PageID=35&ParentPageID=26&NavID=35&ProductID=16&PageText=off > /index.cfm?PageID=35&ParentPageID=26&NavID=35&ProductID=11&PageText=off map $request\_uri $is\_old\_also { default 0; ~/index.cfm?PageID=\d+&ParentPageID=\d+&NavID=\d+&ProductID=\d+&PageText=off 1; } Then you use the same type of if in location like exemplified by Denis before. Just also a test for $is\_old\_also. … if ($is\_old\_also) { return 301 ; } > and these for example would map to another unique page. > > The parameters specify the actual page that must be mapped to. And > since I now know I can’t use regex on query parameters, is there a > way to handle this situation? See above. Try it. — appa ---
**Author:** ![victor](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/v/3e96dc/32.png) [@victor](https://www.ruby-forum.com/u/victor)\ **Post date:** [October 19, 2011, 7:08pm UTC](https://www.ruby-forum.com/t/having-trouble-understand-how-rewrite-works/212976/10 "2011-10-19T19:08:25Z")
Ah sorry, this one was meant for you Denis, not sure how gmail handled it. * * * Thanks again. I understand the map solution. Here’s another issue, you see, the links below all map to the index page (there are other pages too, that have those PageID, ParentPageID, etc.. parameters). /index.cfm?PageID=1 /index.cfm?resetCache=yes /index.cfm?PageID=1&ParentPageID=1&NavID=1 /index.cfm?PageID=22&ParentPageID=1&NavID=22 /index.cfm?PageID=14&ParentPageID=38&NavID=38&ReferringPage=1 all map to / (index) /index.cfm?PageID=35&ParentPageID=26&NavID=26 /index.cfm?PageID=35&ParentPageID=26&NavID=35&ProductID=8&PageText=off /index.cfm?PageID=35&ParentPageID=26&NavID=35&ProductID=9&PageText=off /index.cfm?PageID=35&ParentPageID=26&NavID=35&ProductID=10&PageText=off /index.cfm?PageID=35&ParentPageID=26&NavID=35&ProductID=15&PageText=off /index.cfm?PageID=35&ParentPageID=26&NavID=35&ProductID=16&PageText=off /index.cfm?PageID=35&ParentPageID=26&NavID=35&ProductID=11&PageText=off and these for example would map to another unique page. The parameters specify the actual page that must be mapped to. And since I now know I can’t use regex on query parameters, is there a way to handle this situation? 2011/10/19 Denis F. Latypoff [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid): > map $arg\_PageID $is\_old { > > # regular rules > > > > - > > > > > > ``` > > > } > > > > > > ``` > > > > > > > proxy\_set\_header X-Real-IP $remote\_addr; > > > > > > > > nginx mailing list > > > > Victor Noagbodji > > * * * > > nginx mailing list > [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) > [mailman.nginx.org archive](http://mailman.nginx.org/mailman/listinfo/nginx) – Victor Noagbodji [http://www.victorsreviews.com](http://www.victorsreviews.com)