ngx.location.capture_multi multiple posts

[Matthias Rieber]

Hello,

I try to use ngx.location.capture_multi to send multiple post requests:

  upstream _server1 {
    server server1:80;
  }

  upstream _server2 {
    server server2:80;
  }

  server {
    listen 10.0.0.254:80;
    server_name server.internal;

    location / {
      content_by_lua '
        upstream_servers = {{"/server1", {copy_all_vars = true, method =
ngx.HTTP_POST}},
                            {"/server2", {copy_all_vars = true, method =
ngx.HTTP_POST}},
                            }
        for i, v in ipairs(upstream_servers) do
          upstream_servers[i][1] = upstream_servers[i][1] ..
ngx.var.request_uri
        end
        results = {ngx.location.capture_multi(upstream_servers)}
        status = 200
        output = ""
        for i, result in ipairs(results) do
          output = output .. result.body
          if status < result.status then
            status = result.status

          end
        end
        ngx.say({output})
        ngx.exit(status)
      ';
    }

    location /server1 {
      rewrite ^/[^/]*/(.*) /$1 break;
      proxy_pass http://_server1;
      proxy_set_header X-Forwarded-For $remote_addr;
    }

    location /server2 {
      rewrite ^/[^/]*/(.*) /$1 break;
      proxy_pass http://_server2;
      proxy_set_header X-Forwarded-For $remote_addr;
    }
  }

The post will be send to server1, but the second one won't be send to
server2. Afer I while the request terminates with the timeout error 408.
When I switch the servers in the table uptream_servers, the request will
be passed to server2, but not to server1. Again, a timeout occurs. When
I replace ngx.HTTP_POST with ngx.HTTP_GET, both requests will be send.

Is it not possible to use ngx.location.capture_multi like that?

matthias