Rewriting URLs from PHP Slim in Nginx Web Server - nginx

I have a question here. I am developing a PHP SLIM framework application hosted for example on mydomain.com and one of my routes is grouped "api" like this:
$app->group(
'/api',
function () {
// All my API routes are here
}
);
I am able to access all my API routes by calling mydomain.com/api/{endpoint}. After deploying my application to production running Nginx, I was asked to convert all my URLs to: api.mydomain.com/{endpoint}. So I created a subdomain and used the code below that I have placed into my nginx configuration file:
location ^~ / {
rewrite ^/(.*$) mydomain.com/api/$1 last;
}
It is supposed to map any calls to api.mydomain.com to mydomain.com/api. However, it only works when an API call is one level for example, the following will work:
api.mydomain.com/resource1
api.mydomain.com/resource2
It will fail when using 2 levels, for example the following will fail. I get a "Method Not Allowed" error.
api.mydomain.com/resource1/inresource1
However when I call mydomain.com/api/resource1/inresource1 i get a successful request. I am not sure what I am doing wrong. I figure it has something to do with my rewrite script and the arguments. I am hoping someone can point me into the right direction.
Regards

The solution was pretty simple (works for me). All I had to do was change my location script to:
location / {
proxy_pass mydomain.com/api;
}
That way it forwards all requests (GET and POST) approriately.

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What I'm trying to accomplish is to be able to pass in a route such as this:
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If you can ring-fence the rewritten URIs with a unique prefix, e.g. /download/myKey123/file.mp3, you can protect the files from direct access by using the internal directive. See this document for details. In which case, you will not need to obfuscate myKey123.
location /download/ {
internal;
...
}

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I tried something like
location /api {
proxy_pass http://127.0.0.1/api;
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This should do the trick (untested):
location /foo {
rewrite /[^/](/.*) $1 break;
# Pass to web server, e.g.:
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}
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Which is more readable and clearer but not as powerful. This is up to you and your regular expression skills.

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Thanks!
http://wiki.nginx.org/NginxHttpCoreModule#try_files

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