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HINTS.md

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Caching

Caching is to be done as follows: The only caching header to be used are:

  • cache-control: max-age=2days, public
  • etag

etag for index file has format like: "i1j1c1", implying index v1, js v1, css v1. So when if-none-match is received, the current etag is verified, as follows: The files that have changed is noted down and only they are pushed If the main index file is not changed, then a 304 response is sent with updated etag

For example, Request etag: i2j1c2 Current etag: i2j3c4 Then response is 304 with etag value i2j3c4, and pushes the js and css files

Example 2 Request etag: i2j3c3 Current etag: i3j4c3 Then the response is 200 sending the index file, updates etag, and pushes only js as it has changed.

This way push and cache can work well.

Compression

How to implement compression?

Consider following:

  • Push with correct caching
  • Compression
  • Cross origin requests