title: How to set correct content-type for apple-app-site-association file on Nginx/Rails
body: <p>In order to set up universal links for an iOS app, I have created an apple-app-site-association file, and placed it in the /public directory of my Rails app. </p>
  
  <p>I can curl it at the correct address, but it returns the wrong content type. Instead of <code>application/json</code> or <code>application/pkcs7-mime</code> it returns <code>application/octet-stream</code>, as you can see in the response here:</p>
  
  <pre><code>curl -i https://example.com/apple-app-site-association
  
  HTTP/1.1 200 OK
  Server: nginx/1.10.1
  Content-Type: application/octet-stream
  Content-Length: 245
  Last-Modified: Mon, 21 Nov 2016 12:45:00 GMT
  Strict-Transport-Security: max-age=31536000
  
  {
    "applinks": {
      "apps": [],
      "details": [
        {
          "appID": "APPPREFIX.com.mycompany.app",
          "paths": [
            "/home*"
          ]
        }
      ]
    }
  </code></pre>
  
  <p>I am attempting to specify a Content-Type in the nginx configuration: </p>
  
  <pre><code>/etc/nginx/sites/sites-available/sitename: 
  
  server {
     ...
     location /apple-app-site-association {
        default_type application/pkcs7-mime;
     }
  }
  </code></pre>
  
  <p>I have saved this change and restarted nginx. This doesn't make any difference to the response from curl. I've also tried <code>location /public/apple-app-site-association {}</code> and a few other variations, to no effect.</p>
  
  <p>What is the correct way to set up nginx to deliver this file with the correct content type?</p>