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Refactor simple-headers-wo-content-type to access-control-request-headers-whitelist. The whitelist behaves differently by `set/difference`-ing `access-control-request-headers` instead of `set/union` the `access-control-allowed-headers`. This way, we do not put unnecessary headers in the response `access-control-allowed-headers`. From testing, the only required header in the whitelist is "Origin". Safari always sends this in "Access-Control-Request-Headers" during pre-flight, whereas the Firefox and Chrome do not.
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Refactor simple-headers-wo-content-type to access-control-request-headers-whitelist.
The whitelist behaves differently by
set/difference-ingaccess-control-request-headersinstead ofset/uniontheaccess-control-allowed-headers. This way, we do not put unnecessaryheaders in the response
access-control-allowed-headers.From testing, the only required header in the whitelist is
"Origin". Safari always sends this in "Access-Control-Request-Headers"
during pre-flight, whereas the Firefox and Chrome do not.