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Accepted
Jonathan
Asked: 2015-07-25 16:36:39 +0800 CST

Do unique GET variables in a URI invalidate the HTTP cache, even if it hasn't expired yet?

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Let's say cachedfile.js expires in 1 year from now, according to the HTTP 1.1 expires header. Will these URI's both be cached seperately in modern browsers?

Request 1

cachedfile.js?var=1

Request 2

cachedfile.js?var=2

Assume Cache-control: public and the same Etag

http

1 Answers

  1. Best Answer

    Yes, they will be cached separately. In fact, one trick developers use to force browsers to pull a new copy of a CSS file after they update it is to append something like ?v=2 to it (e.g. href="styles.css?v=2").

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