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https://bz.apache.org/bugzilla/show_bug.cgi?id=65361

--- Comment #2 from Yann Ylavic <ylavic.dev@gmail.com> ---
The interim responses are passed through connection filters only
(AP_FTYPE_CONNECTION), so I think that mod_headers does not see them (even with
latest 2.4.48), thus the Header directive is ineffective here.

I can't find anything about HSTS and interim responses, but for "101 Switching
Protocols" in particular I don't think it makes much sense anyway when the
protocol is to change to something not HTTP suposedly.

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https://bz.apache.org/bugzilla/show_bug.cgi?id=65361

--- Comment #3 from Ruediger Pluem <rpluem@apache.org> ---
(In reply to Yann Ylavic from comment #2)
> The interim responses are passed through connection filters only
> (AP_FTYPE_CONNECTION), so I think that mod_headers does not see them (even
> with latest 2.4.48), thus the Header directive is ineffective here.
>

I guess you are correct. I missed that ap_send_interim_response uses
r->connection->output_filters instead of r->output_filters.

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https://bz.apache.org/bugzilla/show_bug.cgi?id=65361

--- Comment #4 from Yann Ylavic <ylavic.dev@gmail.com> ---
(In reply to steffen.probst from comment #0)
> We now found that certain responses don't contain the custom header.
> Especially 304 Not Modified doesn't contain it, which is explained in the
> RFC: https://datatracker.ietf.org/doc/html/rfc2616#section-10.3.5

Possibly 2.4.38 did something wrong with 304 and headers set by the Header
directive, though by reading the current code I think it should work with
latest 2.4 (.48).

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https://bz.apache.org/bugzilla/show_bug.cgi?id=65361

--- Comment #5 from steffen.probst@mateso.de ---
Thanks a lot for your quick responses. I really appreciate all your useful
input!

We will test the behavior with the latest version and then I will update the
status of the bug accordingly.

Thanks again!

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https://bz.apache.org/bugzilla/show_bug.cgi?id=65361

steffen.probst@mateso.de changed:

What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution|--- |CLOSED

--- Comment #6 from steffen.probst@mateso.de ---
Definitely resolved as of 2.4.48 for responses with status code 304 Not
Modified.

Thanks again!

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https://bz.apache.org/bugzilla/show_bug.cgi?id=65361

--- Comment #7 from steffen.probst@mateso.de ---
(In reply to Yann Ylavic from comment #4)
> Possibly 2.4.38 did something wrong with 304 and headers set by the Header
> directive, though by reading the current code I think it should work with
> latest 2.4 (.48).

Can you tell me the version with which the bug was initially fixed? I tried to
find something in the changelog but don't really know what I am exactly looking
for.

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https://bz.apache.org/bugzilla/show_bug.cgi?id=65361

--- Comment #8 from Ruediger Pluem <rpluem@apache.org> ---
(In reply to steffen.probst from comment #7)
> (In reply to Yann Ylavic from comment #4)
> > Possibly 2.4.38 did something wrong with 304 and headers set by the Header
> > directive, though by reading the current code I think it should work with
> > latest 2.4 (.48).
>
> Can you tell me the version with which the bug was initially fixed? I tried
> to find something in the changelog but don't really know what I am exactly
> looking for.

This should be bug 61820

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