CODEWITHSUNDEEP
ruby-on-railsnginxcors
GeorgieF
GeorgieF

Reputation: 2737

Rails3 and NginX CORS headers

I have a Rails3 app hosted via NginX which provides a JSON API that shall support cross origin resource sharing (CORS). The related headers should be added via NginX, not via the Rails app.

Therefore I added a catcher in routes.rb to fetch OPTIONS preflight requests:

match "*options", controller: "application", action: "options", constraints: { method: "OPTIONS" }

and I added the corresponding endpoint to my application controller:

def options
  render :text => "", :layout => false
end

Works. Now I want a wide open CORS config for my NginX:

    server {
            listen 80;
            server_name localhost;
            passenger_enabled on;
            root /home/deployer/apps/fooapp/current/public;

            location /v1 {
                    if ($request_method = 'OPTIONS') {
                            add_header 'Access-Control-Allow-Origin' '*';
                            add_header 'Access-Control-Allow-Methods' 'GET, POST, OPTIONS';
                            add_header 'Access-Control-Allow-Headers' 'DNT,X-Mx-ReqToken,Keep-Alive,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type,X-FooApp-Auth-Token';
                            add_header 'Access-Control-Max-Age' 1728000;
                            add_header 'Content-Type' 'text/plain charset=UTF-8';
                            add_header 'Content-Length' 0;
                            return 200;
                    }
                    if ($request_method = 'POST') {
                            add_header 'Access-Control-Allow-Origin' '*';
                            add_header 'Access-Control-Allow-Methods' 'GET, POST, OPTIONS';
                            add_header 'Access-Control-Allow-Headers' 'DNT,X-Mx-ReqToken,Keep-Alive,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type,X-FooApp-Auth-Token';
                    }
                    if ($request_method = 'GET') {
                            add_header 'Access-Control-Allow-Origin' '*';
                            add_header 'Access-Control-Allow-Methods' 'GET, POST, OPTIONS';
                            add_header 'Access-Control-Allow-Headers' 'DNT,X-Mx-ReqToken,Keep-Alive,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type,X-FooApp-Auth-Token';
                    }
            }
    }

Great, OPTIONS request have all the needed headers in the response now:

curl -i -H'Accept: application/json' -H'Content-Type: application/json' -XOPTIONS 'http://api.fooapp.net/v1/api_session' -d'{"user":{"email":"[email protected]", "password":"somepassword"}}'

HTTP/1.1 200 OK
Server: nginx/1.2.3
Date: Sun, 02 Sep 2012 11:04:28 GMT
Content-Type: application/octet-stream
Content-Length: 0
Connection: keep-alive
Access-Control-Allow-Origin: *
Access-Control-Allow-Methods: GET, POST, OPTIONS
Access-Control-Allow-Headers: DNT,X-Mx-ReqToken,Keep-Alive,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type,X-FooApp-Auth-Token
Access-Control-Max-Age: 1728000
Content-Type: text/plain charset=UTF-8
Content-Length: 0

But a real POST requests for example now fails with a 404:

curl -i -H'Accept: application/json' -H'Content-Type: application/json' -XPOST 'http://api.fooapp.net/v1/api_session' -d'{"user":{"email":"[email protected]", "password":"somepassword"}}'

HTTP/1.1 404 Not Found
Server: nginx/1.2.3
Date: Sun, 02 Sep 2012 11:06:19 GMT
Content-Type: text/html
Content-Length: 168
Connection: keep-alive

<html>
<head><title>404 Not Found</title></head>
<body bgcolor="white">
<center><h1>404 Not Found</h1></center>
<hr><center>nginx/1.2.3</center>
</body>
</html>

And it has to, cause the NginX log says:

2012/09/02 13:06:19 [error] 2464#0: *3 open() "/home/deployer/apps/fooapp/current/public/v1/api_session" failed (2: No such file or directory), client: 127.0.0.1, server: localhost, request: "POST /v1/api_session HTTP/1.1", host: "api.fooapp.net"

I am new to NginX, and I know thats a wide open as well as very lightweight configuration. I do not understand why NginX tries to route these requests via public, so that the underlying Rails app is not requested. How do I have to change the configuration, so that all my requests are passed to the app as before, but the CORS headers are added anyway?

Thx in advance

Felix

Upvotes: 3

Views: 2349

Answers (1)

jseravalli
jseravalli

Reputation: 46

This comes a little late but since I just ran into the same problem it might help somebody else.

You need to enable passenger inside the location block

location /{
     ...
     passenger_enabled on;
     ...
 }

I hope this helps.

Upvotes: 2

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