[FIX] File upload on multi-instances using a path prefix #7855
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@RocketChat/core
Closes #ISSUE_NUMBER
When running RC with multi-instances and a path prefix like http://domain.com/rocket-chat, file uploads return an error when 2 requests are handled by different instances. The reason is req.url does not contain url prefix (it's stripped by Meteor https://github.com/meteor/meteor/blob/59aca741ccc22fbacc72786b94c97d74fb66e3a9/packages/webapp/webapp_server.js#L618) so when the request is rerouted to the correct instance it goes MIA.
I tested this change with 1 and many instances running, with a prefix and no prefix and using S3 and FileSystem.