On Wed, 8 Oct 2025 18:47:18 GMT, robert engels <d...@openjdk.org> wrote:

> There is another issue with using sendResponseHeaders() for the interim 
> responses. A filter could add response headers. when you call the 
> sendResponseHeaders() it sends all of the headers, meaning you would send 
> headers at this time which aren't valid. You would also send them again when 
> you send the final response.

Is this not allowed? Don't see anywhere it says that you cannot send headers 
for a 1xx code.

> The server could easily be changed to never send the headers with a 1xx 
> response.

See, that doesn't fly as you need to be able to send headers in cases like 101.

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PR Comment: https://git.openjdk.org/jdk/pull/27069#issuecomment-3382870818

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