server-configs-nginx/h5bp/cross-origin/resource_timing.conf

# ----------------------------------------------------------------------
# | Cross-origin resource timing                                       |
# ----------------------------------------------------------------------

# Allow cross-origin access to the timing information for all resources.
#
# If a resource isn't served with a `Timing-Allow-Origin` header that would
# allow its timing information to be shared with the document, some of the
# attributes of the `PerformanceResourceTiming` object will be set to zero.
#
# https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Timing-Allow-Origin
# https://www.w3.org/TR/resource-timing/
# https://www.stevesouders.com/blog/2014/08/21/resource-timing-practical-tips/

add_header Timing-Allow-Origin "*";