Why the status code restriction on add_header?

[Richard Stanway]

Hello,
I'm trying to add some custom headers to a 403 response, but had a hard
time doing so. Looking through the docs, it seems add_header "Adds the
specified field to a response header provided that the response code equals
200, 201, 204, 206, 301, 302, 303, 304, or 307. "

I was wondering what the reasoning was behind this pre-set list of status
codes and why it isn't possible for example to add a header to a 403 or 404
response. Also, if there is any workaround that would make this possible,
I'd be interested to hear it.

Thanks,

Rich.
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