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Allow sending traffic to php 7.2 or 7.4 selectively in the apache configuration for MediaWiki
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Description

Given we'll transition from php 7.2 to php 7.4, we want to run the two daemons in parallel and to be able to route traffic to one or the other based on some characteristic of the request (typically: a cookie).

This is basically what we did back in the day for the HHVM => php7 transition.

Event Timeline

Which brings again our usual issue, to cache slot or not to cache slot? If we don't want to slot the caches, we could consider following what we are planning to do in T290536

Joe triaged this task as High priority.