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New in version 1.5 is the http-response add-header directive. As written in the documentation -- this can be used in frontend, backend and listen.

What I was trying to within a frontend section:

use_backend some_backend                if some_condition
http-response add-header Vary Origin    if some_condition

But this has no effect. The same line placed in the backend section works perfectly fine. Can someone please help me understand, what I am missing here? I don't understand, why this does not work in the frontend section.

My guess would be that within the fronted there is no response yet and so the directive fails. I tried using it before and after die use_backend directive.

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