无法获取auth_request返回的标头和状态码

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我有以下测试nginx配置：

user  nginx;
worker_processes  auto;

error_log /dev/stderr debug;
pid        /var/run/nginx.pid;


events {
    worker_connections  1024;
}


http {
    include       /etc/nginx/mime.types;
    default_type  application/octet-stream;

    access_log  /dev/stderr  main;

    sendfile        on;

    keepalive_timeout  65;

    upstream content {
      server 127.0.0.1:4001;
    }

    server {
        listen 4000;
        server_name test;
        gzip off;
        autoindex off;

        location /test-auth {
            add_header X-Test "testvalue";
            return 200;
        }

        location /proxy {
            add_header "X-Test1" "test1";
            auth_request /test-auth;
            auth_request_set $test $sent_http_x_test;
            auth_request_set $test2 $upstream_status;
            add_header X-Test $test;
            add_header X-Test2 $test2;
            proxy_pass http://content?test=$test&test2=$test2;
            proxy_pass_request_body off;
        }
    }

    server {
        listen 4001;
        add_header X-Test3 "test3";
        return 200 "testt response $args";
    }
}

我期望请求HTTP将返回所有测试头：X-Test (由身份验证请求返回的头)、X-Test1 (仅是一个示例)、X-Test2 (身份验证请求HTTP的值)、X-Test3 (由content下游设置)。

但实际上，这个请求只返回X-Test1和X-Test2。我无法通过auth_request_set指令获取任何值(标头或返回状态)。我尝试了在谷歌中找到的两种变量名：KaTeX parse error: Double subscript at position 12: sent_http_x_̲test和upstream_http_x_test，但都没有成功。$test变量始终为空。

我看到了以下官方示例：，
但auth_request_set $test2 $upstrea{m}_{s}tatus;行也不起作用，$test2变量始终为空。

我哪里做错了？

问题是/test-auth位置没有配置上行，您可以尝试下面的配置。

改成 $upstream_http_x_test。

user  nginx;
worker_processes  auto;

error_log /dev/stderr debug;
pid        /var/run/nginx.pid;


events {
    worker_connections  1024;
}


http {
    include       /etc/nginx/mime.types;
    default_type  application/octet-stream;

    access_log  /dev/stderr  main;

    sendfile        on;

    keepalive_timeout  65;

    upstream content {
      server 127.0.0.1:4001;
    }

    server {
        listen 4000;
        server_name test;
        gzip off;
        autoindex off;

        location /real-auth {
            add_header X-Test "testvalue";
            return 200;
        }
        
        location /test-auth {
            proxy_pass http://127.0.0.1:4000/real-auth;
        }

        location /proxy {
            add_header "X-Test1" "test1";
            auth_request /test-auth;
            auth_request_set $test $upstream_http_x_test;
            auth_request_set $test2 $upstream_status;
            add_header X-Test $test;
            add_header X-Test2 $test2;
            proxy_pass http://content?test=$test&test2=$test2;
            proxy_pass_request_body off;
        }
    }

    server {
        listen 4001;
        add_header X-Test3 "test3";
        return 200 "testt response $args";
    }
}

Why does auth_request require proxy_pass to be able to get headers and return status? –

1. Alexander Pravdin
   Oct 13, 2021 at 15:17
   Seems that auth_request do not send request directlly, it looks like reading configure from /test-auth block. you can check the access.log, there’s requests sent to /test-auth, auth requests are directly sent to /real-auth –
   emptyhua
   Oct 13, 2021 at 15:23

2. One of nginx contributors helped to find out the root cause: github.com/nginx/njs/issues/417#issuecomment-942494313 The issue is in ngx_http_headers_module. add_header is ignored for subrequest “(r != r->main)”, and auth_request is a subrequest. This means that add_header is working differently when a location is directly accessed versus as a subrequest. –
   Alexander Pravdin
   Oct 13, 2021 at 17:10

原文链接: https://stackoverflow.com/questions/69556521/can-not-get-headers-and-status-code-returned-by-auth-request