nginx update for CORS access

Author: jreadey

nginx.tmpl

@@ -273,6 +273,28 @@ server {
     {{ end }}
 
     location / {
+        if ($request_method = 'OPTIONS') {
+            add_header 'Access-Control-Allow-Origin' '*';
+            add_header 'Access-Control-Allow-Methods' 'GET, POST, OPTIONS';
+            add_header 'Access-Control-Allow-Headers' 'DNT,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type,Range';
+            add_header 'Access-Control-Max-Age' 1728000;
+            add_header 'Content-Type' 'text/plain; charset=utf-8';
+            add_header 'Content-Length' 0;
+            return 204;
+        }
+        if ($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,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type,Range';
+            add_header 'Access-Control-Expose-Headers' 'Content-Length,Content-Range';
+        }
+        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,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type,Range';
+            add_header 'Access-Control-Expose-Headers' 'Content-Length,Content-Range';
+        }
+
         {{ if eq $proto "uwsgi" }}
         include uwsgi_params;
         uwsgi_pass {{ trim $proto }}://{{ trim $upstream_name }};