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https://issues.apache.org/jira/browse/MESOS-708?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14621394#comment-14621394
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Till Toenshoff commented on MESOS-708:
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See MESOS-3026 for some serious problems of these patches.
> Static files missing "Last-Modified" HTTP headers
> -------------------------------------------------
>
> Key: MESOS-708
> URL: https://issues.apache.org/jira/browse/MESOS-708
> Project: Mesos
> Issue Type: Improvement
> Components: libprocess, webui
> Affects Versions: 0.13.0
> Reporter: Ross Allen
> Assignee: Alexander Rojas
> Labels: mesosphere
>
> Static assets served by the Mesos master don't return "Last-Modified" HTTP
> headers. That means clients receive a 200 status code and re-download assets
> on every page request even if the assets haven't changed. Because Angular JS
> does most of the work, the downloading happens only when you navigate to
> Mesos master in your browser or use the browser's refresh.
> Example header for "mesos.css":
> HTTP/1.1 200 OK
> Date: Thu, 26 Sep 2013 17:18:52 GMT
> Content-Length: 1670
> Content-Type: text/css
> Clients sometimes use the "Date" header for the same effect as
> "Last-Modified", but the date is always the time of the response from the
> server, i.e. it changes on every request and makes the assets look new every
> time.
> The "Last-Modified" header should be added and should be the last modified
> time of the file. On subsequent requests for the same files, the master
> should return 304 responses with no content rather than 200 with the full
> files. It could save clients a lot of download time since Mesos assets are
> rather heavyweight.
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