openresty / openresty/lua-nginx-module

Set/Remove response headers without underscore to hyphen normalization

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Dominant language
C
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Description

Hi @agentzh,

I would like to add support to set response headers without applying underscore to hyphen normalization. I know we can enable this globally by setting lua_transform_underscores_in_response_headers, but I need a way to do this on specific cases, while maintaining the normalization enabled globally.

I can implement this an open a PR, but I think it is a good idea to first discuss how this would look like. My idea is to create a function ngx.resp.set_header_raw(header_name, header_value) (header_value can be a string or a table, just like with ngx.header.HEADER).

Does that sound reasonable?

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Research direction

Start by reviewing the response-header handling behind ngx.header.HEADER and the lua_transform_underscores_in_response_headers setting. Evaluate the proposed ngx.resp.set_header_raw(header_name, header_value) API, including string and table values, and define completion as allowing selected response headers to bypass underscore-to-hyphen normalization while the global behavior remains enabled.

Written by the indexing model from the issue text.

Assessment

Tech stack
c, lua
Domain
api, backend
Issue type
Feature
Difficulty
5/5
Estimated time
Over a week
Activity status
Stale
Clarity
Mostly clear
Newbie friendliness
25/100

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