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Cache-control: max-age=3600 will force browsers to cache static files for one hour. This commit also enables headers module that allows adding HTTP headers from apache.
Due to missing cache-control headers, some browsers might have picked a long caching time based on heuristics. This commits forces browsers to refresh messages cache.
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This PR adds a caching header for static files. The header should force browser to cache static files for one hour.
After a cached file expires, browser usually revalidate it by making a conditional request (If-None-Match, If-Modified-Since). It seems that Apache does support conditional requests - a simple test can be done by reducing the caching time to 10 seconds and browsing Elixir for a while. After every 10 second period, first request to each static file gets a 304, unless the file was modified on the disk.
The PR also adds ?v to messages URL, and increments ?v on script.js to make sure that browser refresh the messages file.