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etr / libhttpserver

C++ library for creating an embedded Rest HTTP server (and more)
GNU Lesser General Public License v2.1
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[Question] Change headers of a deferred_response #278

Open azertyalex opened 2 years ago

azertyalex commented 2 years ago

I am implementing a deferred_response. After reading the docs @ https://github.com/etr/libhttpserver/blob/master/README.md?plain=1#L632

It looks to me that I can not change headers or content-type after my deferred_response has been returned in the render function, I modify the object but I see no changes. It looks like a need more of a promise instead of a deferred response?

Is it in any way possible to set headers after render has been returned?

etr commented 2 years ago

This is as intended and it is an effect of the protocol (HTTP-1.1) not of the library. If you have already given the answer to your client, they've already received the headers. All you are doing with a deferred response is saying to them "I have more content here" but none of this content can override what you've already given to them (included the headers).

I hope this helps, but if you want to and can describe your use-case, I can see if there is a workaround in a way that is compatible with the protocol.