Ross Allen created MESOS-708:
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Summary: Static files missing "Last-Modified" HTTP headers
Key: MESOS-708
URL: https://issues.apache.org/jira/browse/MESOS-708
Project: Mesos
Issue Type: Bug
Components: libprocess, webui
Affects Versions: 0.13.0
Reporter: Ross Allen
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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