Can’t remove Server-Timing header using response header modification yet not part of the restricted headers that you can’t modify or remove.
Static or dynamic value just prepends to the header value
I am afraid it’s Cloudflare’s new implemented header by default and cannot be removed via Transform Rules → Response Header, despite the RUM feature is disabled (which seems to add a few more headers related to), as follows in the blogpost below:
May I ask why’d you need to remove it?
Removing it is because I do periodic measurements on the site for performance analysis and could save bandwidth costs where I remove unnecessary headers that aren’t needed during analysis.
When one tries to modify or remove restricted headers like Server or cf-*, an error is mostly raised, but for Server-Timing header, no error is raised. So maybe I thought it was an error on part of their implementation because they haven’t mentioned it anywhere on their docs.
Also, headers like alt-svc are ignored from removing but they don’t mention it anywhere on the docs.
This header is also a standard from W3C, not just specific to cloudflare.
