add a URL suffix path (for mobile AMP) without causing a redirect loop in nginx

Question

i am using nginx web server for my wordpress website. i am going to make it to become amp version for mobile serve.

i wanna add /amp/ to my url. i also using pretty permalink for my current url,so may i know how can i rewrite my url in mobile version to /amp/

i am using rewrite ^ http://example.com$request_uri/amp/ break; but when i serve the web it become this

exmaple.com/homepage//amp//amp//amp//amp//amp//amp//amp//amp//amp//amp//amp//amp//amp//amp//amp//amp//amp//amp//amp//amp//amp/ 

i wish when iphone serve the webpage, the link will be http://exmaple.com/homepage/amp/

the main purpose i only want add /amp/ to any link of the website.

this is my nginx.conf

server { listen 80; server_name example.com; charset utf-8; access_log logs/xxx.access.log; root /var/www/html; index index.php; location / { try_files $uri $uri/ /index.php?q=$uri; } location /en { try_files $uri $uri/ /en/index.php?q=$uri; } location /my { try_files $uri $uri/ /my/index.php?q=$uri; } set $mobile_rewrite do_not_perform; if ($http_user_agent ~* " (android|bb\d+|meego).+mobile|ip(hone|od) { set $mobile_rewrite perform; } ## redirect to AMP ## if ($mobile_rewrite = perform) { rewrite ^ http://example.com$request_uri/amp/ break; break; } 

Thanks

Answer 1

It sounds like you have a redirect loop, because you keep on adding /amp/ at the end of your request URL.

Perhaps you should have a conditional rewrite directive (or two!) instead of a wildcard.

-rewrite ^ http://example.com$request_uri/amp/ break; +rewrite ^(.*(?<!/amp))/$ http://example.com$1/amp/ break; +rewrite ^.*(?<!/amp/)$ http://example.com$uri/amp/ break; 

The above ensures that the rewrite will only happen if your URL doesn't already end in /amp/ (using the lookbehind assertions of PCRE, which is the library that NGINX is using for support of the regular expressions); additionally, it should also take care of the double // that were appearing in your scheme originally.