Is it possible to set proxy header from Lua code?

[Zaar Hai]

Good day guys,

I'm using access_by_lua_block on a proxy server to check incoming credentials and I would like to forward resulting user to the backend. I see that most examples declare nginx var, set it in Lua, then use it in proxy_set_header.

Is there a way to set proxy headers directly from lua?

E.g. instead of:

location / {

    set $user "";

    access_by_lua_block {

        ngx.var.user = "foo"

    }

    proxy_set_header X-Forwarded-User $user;

    proxy_pass ...

}

Something like:

location / {

    access_by_lua_block {

        ngx.proxy.set_header("X-Forwarded-User", "foo")

    }

    proxy_pass ...

}

Thanks in advance,

Zaar

[Rob Kay]

I believe you want:

ngx.req.set_header("X-Forwarded-User", "foo")

https://github.com/openresty/lua-nginx-module#ngxreqset_header

[Zaar Hai]

Thank you! It did the trick.

Filed PR note that in docs: https://github.com/openresty/lua-nginx-module/pull/1525