title: ERR_CONTENT_LENGTH_MISMATCH on nginx and proxy on Chrome when loading large files
body: <p>I'm getting the following error on my chrome console:</p>
  
  <pre><code>GET http://localhost/grunt/vendor/angular/angular.js net::ERR_CONTENT_LENGTH_MISMATCH 
  </code></pre>
  
  <p>This only happens when a simultaneous requests are shot towards nginx e.g. when the browsers cache is empty and the whole app loads. Loading the resource above as a single requests succeeds.</p>
  
  <p>Here are the headers to this requests, copied from Chrome:</p>
  
  <pre><code>Remote Address:127.0.0.1:80
  Request URL:http://localhost/grunt/vendor/angular/angular.js
  Request Method:GET
  Status Code:200 OK
  Request Headersview source
  Accept:*/*
  Accept-Encoding:gzip,deflate,sdch
  Accept-Language:en-US,en;q=0.8,de;q=0.6,pl;q=0.4,es;q=0.2,he;q=0.2,gl;q=0.2
  Cache-Control:no-cache
  Connection:keep-alive
  Cookie:gs_u_GSN-265185-D=1783247335:2567:5000:1377697930719
  Host:localhost
  Pragma:no-cache
  Referer:http://localhost/grunt/
  User-Agent:Mozilla/5.0 (Macintosh; Intel Mac OS X 10_9_4) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/37.0.2062.122 Safari/537.36
  Response Headersview source
  Accept-Ranges:bytes
  Cache-Control:public, max-age=0
  Connection:keep-alive
  Content-Length:873444
  Content-Type:application/javascript
  Date:Tue, 23 Sep 2014 11:08:19 GMT
  ETag:"873444-1411465226000"
  Last-Modified:Tue, 23 Sep 2014 09:40:26 GMT
  Server:nginx/1.6.0
  </code></pre>
  
  <p>the real size of the file:</p>
  
  <pre><code>$ ll vendor/angular/angular.js
  -rw-rw-r--  1 xxxx  staff  873444 Aug 30 07:21 vendor/angular/angular.js
  </code></pre>
  
  <p>As you can see <code>Content-Length</code> and the real size of the file are the same, so that's weird</p>
  
  <p>And the nginx configuration to this proxy:</p>
  
  <pre><code>location /grunt/ {
      proxy_pass  http://localhost:9000/;
  }
  </code></pre>
  
  <p>Any ideas?</p>
  
  <p>Thanks</p>
  
  <p>EDIT: found more info on the error log:</p>
  
  <pre><code>2014/09/23 13:08:19 [crit] 15435#0: *8 open() "/usr/local/var/run/nginx/proxy_temp/1/00/0000000001" failed (13: Permission denied) while reading upstream, client: 127.0.0.1, server: localhost, request: "GET /grunt/vendor/angular/angular.js HTTP/1.1", upstream: "http://127.0.0.1:9000/vendor/angular/angular.js", host: "localhost", referrer: "http://localhost/grunt/"
  </code></pre>