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In http_filters:ap_http_header_filter, 304 responses get special treatment, in that they're sent with only a fixed set of headers (if present):
https://bz.apache.org/bugzilla/show_bug.cgi?id=61820#c23

Due to this we are unable to use CORS.

This has been fixed on latest apache (2.4.47) :
https://downloads.apache.org/httpd/Announcement2.4.html

Are you planning to fix this bug, it became quite a big problem since Chrome and other browsers are starting to have stricter rules concerning CORS usage ?

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