nginx - rewrite js file with php file

Question

with apache I use a file config.php to rewrite a file config.js based on domain, config.js contains placeholders which are replaced by RewriteRule directive, this is .htaccess file:

<IfModule mod_rewrite.c>
    RewriteBase /foo
    RewriteEngine On
    RewriteRule config.js config.php [L,QSA]
</IfModule>

When i go into URL production.com/foo/config.js i see some values, instead into develop.com/foo/config.js i see other values, defined into config.php

Now i need move to nginx but i don't understand how to replicate the apache rule, i tried:

location /foo {
  alias /src/www/foo;
  index index.html;
  rewrite config.js config.php break;
  }

But have internal server error

Thanks

Sorry, I write about last instead of break but didn't change it in a config code block. Updated an answer. — Ivan Shatsky
– Ivan Shatsky, Commented Oct 7, 2020 at 13:12

Ivan Shatsky · Accepted Answer · 2020-10-07 13:13:32Z

2

All nginx URIs starts with slash. Using rewrite config.js config.php you are rewriting an URI from /foo/config.js to config.php. That URI cannot be processed by nginx causing internal server error.

First argument of rewrite directive is always treated as a regex where dot matched any symbol. So your rewrite rule would match any string containing config*js substring. I don't think it is what you really want.

Second argument of rewrite directive is a whole new URI, not a substitution part of the string. To make a substitution use something like rewrite ^(.*)old-string(.*)$ $1new-string$2.

Since you are rewriting your request to PHP script you should force nginx to process new URI with a location where your PHP-FPM handler is defined. To do it you should use last flag instead of break one with the rewrite directive.

Summing all of this, you need something like

location /foo {
    alias /src/www/foo;
    index index.html;
    rewrite ^/foo/config\.js$ /foo/config.php last;
}

One more note. As nginx documentation states:

When location matches the last part of the directive’s value:
location /images/ {
    alias /data/w3/images/;
}
it is better to use the root directive instead:
location /images/ {
    root /data/w3;
}

so it would be better to use root /src/www; instead of alias /src/www/foo; within this location block if that foo substrings are really equal.

edited Oct 7, 2020 at 13:13

answered Oct 7, 2020 at 12:44

Ivan Shatsky

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6 Comments

stecog Over a year ago

Thanks for reply, in this way when i go to example,com/foo/config.js i see the file config.php

Ivan Shatsky Over a year ago

@hellb0y77 So you do not set up nginx to work with PHP-FPM (or any other PHP handler) yet? You should have php-fpm installed on your server and a special location ~ \.php$ { ... } defined to use it (this is the most common approach, there are other choices, NGINX Unit for example). Default nginx config should have an example for using PHP-FPM (commented by default). This is out of the scope of your question, check this one.

stecog Over a year ago

nginx work with php-fpm, I've tried to place a phpinfo file at the same path of config.php and work.

Ivan Shatsky Over a year ago

@hellb0y77 Do you have rewrite ... last;, not the rewrite ... break;? Maybe your browser cached the response?

stecog Over a year ago

yes rewrite ^/foo/config.js$ /foo/config.php last;

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