好奇怪啊

location / {
    #root   /usr/local/openresty/nginx/html;
    #index  index.html index.htm;

    proxy_set_header X-Real-IP $remote_addr;
    default_type text/html;
    content_by_lua '
        ngx.say(ngx.req.get_headers()["X-real-ip"])
    ';
}

这是我nginx里面的代码

===test==http_version:
===test==raw_header:
===test==set_header:
===test==set_uri:
===test==set_uri_args:
===test==get_post_args:
===test==read_body:
===test==discard_body:
===test==get_body_data:
===test==get_body_file:
===test==set_body_data:
===test==set_body_file:
===test==init_body:
===test==append_body:
===test==finish_body:
===test==socket:
===test==is_internal:

没有get_headers。。。。。。_

proxy_set_header 是为上游的服务器设置请求头，无法在 content_by_lua 阶段获取到该内容