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我在开源最新的 nginx 上使用下面的 nginx conf：

user nginx;
worker_processes  1;
error_log /var/log/nginx/error.log notice;
pid /var/run/nginx.pid;
events {
    worker_connections 1024;
}

http {
   map $upstream_trailer_grpc_status $grpc_status {
    default $upstream_trailer_grpc_status; # We normally expect to receive grpc-status as a trailer
    ''      $sent_http_grpc_status;        # Else use the header, regardless of who generated it
   }
   log_format grpc_json escape=json '{"client":"$remote_addr",'
                                  '"uri":"$uri","http-status":$status,'
                                  '"grpc-status":$grpc_status,"upstream":"$upstream_addr",'
                                  '"connection":$connection,"tx-bytes":$bytes_sent}';

   upstream client_a_internal {
     zone client_a_internal 64k;
     server 127.0.0.1:7001;
     server 127.0.0.1:7002;
 
   }
   server {
      listen 7001 http2;
      location / {
        grpc_pass grpc://192.168.127.129:7001;
        grpc_pass_header X-Upstream;
        grpc_set_header X-Upstream 7001;
      }
   }
   server {
      listen 7002 http2;
      location / {
        grpc_pass grpc://192.168.127.129:7002;
        grpc_pass_header X-Upstream;
        grpc_set_header X-Upstream 7002;
      }
   }
   server {
      listen 5087 http2;
      access_log /var/log/nginx/grpc_log.json grpc_json;
      location / {
         grpc_pass grpc://client_a_internal;
         grpc_next_upstream error timeout http_500 http_502 http_503 http_504 non_idempotent;
      }
   }
}

此处 192.168.127.129:7002 始终处于关闭状态，而 192.168.127.129:7001 仅处于打开状态。我想检查 nginx 是否应该尝试其他服务器，以防出现 502 错误。

但我观察到它只尝试一个上游服务器，即使它得到 502 响应。

相同的访问日志：理想情况下，它应该在上游服务器中显示 2 个服务器，但事实并非如此。

{"client":"192.168.127.134","uri":"/helloworld.Greeter/SayHello","http-status":**502**,"grpc-status":,"upstream":"**127.0.0.1:7002**","connection":1,"tx-bytes":238}
{"client":"192.168.127.134","uri":"/helloworld.Greeter/SayHello","http-status":**502**,"grpc-status":,"upstream":"**127.0.0.1:7002**","connection":1,"tx-bytes":238}
{"client":"192.168.127.134","uri":"/helloworld.Greeter/SayHello","http-status":**502**,"grpc-status":,"upstream":"**127.0.0.1:7002**","connection":1,"tx-bytes":238}
{"client":"192.168.127.134","uri":"/helloworld.Greeter/SayHello","http-status":**502**,"grpc-status":,"upstream":"**127.0.0.1:7002**","connection":1,"tx-bytes":238}
{"client":"192.168.127.134","uri":"/helloworld.Greeter/SayHello","http-status":**502**,"grpc-status":,"upstream":"**127.0.0.1:7002**","connection":1,"tx-bytes":238}
{"client":"192.168.127.134","uri":"/helloworld.Greeter/SayHello","http-status":**200**,"grpc-status":0,"upstream":"127.0.0.1:7001","connection":1,"tx-bytes":183}
{"client":"192.168.127.134","uri":"/helloworld.Greeter/SayHello","http-status":**200**,"grpc-status":0,"upstream":"127.0.0.1:7001","connection":1,"tx-bytes":183}
{"client":"192.168.127.134","uri":"/helloworld.Greeter/SayHello","http-status":**200**,"grpc-status":0,"upstream":"127.0.0.1:7001","connection":1,"tx-bytes":183}
{"client":"192.168.127.134","uri":"/helloworld.Greeter/SayHello","http-status":**200**,"grpc-status":0,"upstream":"127.0.0.1:7001","connection":1,"tx-bytes":183}
{"client":"192.168.127.134","uri":"/helloworld.Greeter/SayHello","http-status":**200**,"grpc-status":0,"upstream":"127.0.0.1:7001","connection":1,"tx-bytes":183}
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