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| -rw-r--r-- | guides/source/asset_pipeline.md | 48 |
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diff --git a/guides/source/asset_pipeline.md b/guides/source/asset_pipeline.md index 9a22ec5700..3d11d2ba82 100644 --- a/guides/source/asset_pipeline.md +++ b/guides/source/asset_pipeline.md @@ -1022,6 +1022,54 @@ not exist `/assets/i-dont-exist.png` and your Rails application returns a 404, then your CDN will likely cache the 404 page if a valid `Cache-Control` header is present. +##### CDN Header Debugging + +One way to check the headers are cached properly in your CDN is by using [curl]( +http://explainshell.com/explain?cmd=curl+-I+http%3A%2F%2Fwww.example.com). You +can request the headers from both your server and your CDN to verify they are +the same: + +``` +$ curl -I http://www.example/assets/application- +d0e099e021c95eb0de3615fd1d8c4d83.css +HTTP/1.1 200 OK +Server: Cowboy +Date: Sun, 24 Aug 2014 20:27:50 GMT +Connection: keep-alive +Last-Modified: Thu, 08 May 2014 01:24:14 GMT +Content-Type: text/css +Cache-Control: public, max-age=2592000 +Content-Length: 126560 +Via: 1.1 vegur +``` + +Versus the CDN copy. + +``` +$ curl -I http://mycdnsubdomain.fictional-cdn.com/application- +d0e099e021c95eb0de3615fd1d8c4d83.css +HTTP/1.1 200 OK Server: Cowboy Last- +Modified: Thu, 08 May 2014 01:24:14 GMT Content-Type: text/css +Cache-Control: +public, max-age=2592000 +Via: 1.1 vegur +Content-Length: 126560 +Accept-Ranges: +bytes +Date: Sun, 24 Aug 2014 20:28:45 GMT +Via: 1.1 varnish +Age: 885814 +Connection: keep-alive +X-Served-By: cache-dfw1828-DFW +X-Cache: HIT +X-Cache-Hits: +68 +X-Timer: S1408912125.211638212,VS0,VE0 +``` + +Check your CDN documentation for any additional information they may provide +such as `X-Cache` or for any headers they may + Customizing the Pipeline ------------------------ |