Nginx 镜像不转发到镜像链接

Question

我目前有这个 nginx 设置：

events {
    worker_connections  4096;
}

http {    
    log_format upstreamlog '[$time_local] Forwarding $request from $remote_addr to: ($upstream_addr $request_uri $request) - Statuscode: $upstream_status Response time: $upstream_response_time';
    log_format upstreamlogmirror '[$time_local] Forwarding mirror $request from $remote_addr to: ($upstream_addr $request_uri $request): Statuscode: $upstream_status Response time: $upstream_response_time';

    server {    
        listen        0.0.0.0:80;
        listen        0.0.0.0:443;

        location / {
            access_log  /dev/stdout upstreamlog;
            mirror /mirror;
            proxy_pass https://first.service.com/api/;
            proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        }

        location /mirror {
            internal;
            proxy_pass http://127.0.0.1:55555/;
            proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        }
    }

    server {    
        listen 127.0.0.1:55555;
        location / {
            access_log  /dev/stdout upstreamlogmirror;
            proxy_pass https://second.service.com/;
        }
    }
}

但是，我在这方面遇到了一些困难。

似乎镜像服务器确实收到了一个请求（我在日志中看到它），但是在请求时，例如https://localhost/myroute，它会正确转发到https://first.service.com/api/myroute，但是第二个服务只发送到https://second.service.com/，没有附加路由。

我也尝试用这个设置完成整个事情：

        location / {
            access_log  /dev/stdout upstreamlog;
            mirror /mirror;
            proxy_pass https://first.service.com/api/;
            proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        }

        location /mirror {
            internal;
            access_log  /dev/stdout upstreamlogmirror;
            proxy_pass http://second.service.com/;
            proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        }

这很好用，但在这种情况下，我根本没有得到任何日志。

我哪里错了？

Answer 1

您必须将 $request_uri 添加到 proxy_pass 才能将完整的 URI 发送到第二个镜像后端。刚刚在我的实验室测试过：

server {
  listen 9001;
  log_subrequest on;
  access_log /var/log/nginx/mirror.log upstream_time;
  location / {
    mirror /mirror;
    proxy_pass http://127.0.0.1:9002/;
  }

  location = /mirror {
    proxy_pass http://127.0.0.1:8000$request_uri;
 }
}

server {listen 9002; return 200 "Server 1\n";}

确保将internal 指令添加到镜像位置。

由于来自镜像的响应将被忽略，我正在使用 Python http.server 来伪造我的后端并查看传入请求的跟踪。

python3 -m http.server 8000

Serving HTTP on 0.0.0.0 port 8000 (http://0.0.0.0:8000/) ...
127.0.0.1 - - [05/Feb/2022 22:00:45] code 404, message File not found
127.0.0.1 - - [05/Feb/2022 22:00:45] "GET /test/something HTTP/1.0" 404 -

提交简单 curl 后的 NGINX 日志 curl 127.0.0.1:9001/test/something

127.0.0.1 - - [05/Feb/2022:22:08:46 -0500] "GET /test/something HTTP/1.1" 404 156 "-" "curl/7.29.0" upa="127.0.0.1:8000/test/something" rt=0.003 uct="0.000" uht="0.003" urt="0.003"
127.0.0.1 - - [05/Feb/2022:22:08:46 -0500] "GET /test/something HTTP/1.1" 200 9 "-" "curl/7.29.0" upa="127.0.0.1:9002/test/something" rt=0.003 uct="0.000" uht="0.001" urt="0.001"

要在日志文件中包含正确的 URI，请确保将 $request_uri 添加到日志格式中。 $uri 变量将更改为 /mirror。

阅读更多https://nginx.org/en/docs/http/ngx_http_core_module.html#var_request_uri