如何在重定向的服务器上发出POST请求？

I'm setting up a nginx load balancer on a script.
www.loadbalancer.com/request.php =>
www.example01.com/request.php
www.example02.com/request.php
www.example03.com/request.php

eg. I want to send a POST request and when I go check access_log of www.example.com it shows POST but when I go on www.example01.com it shows GET so it don't use my x-www-form-urlencoded.

I'm on nginx/1.10.3.

www.loadbalancer.com : [date] "POST /request.php HTTP/1.1" 301 185 "-" PostmanRuntime/7.4.0
www.example01.com : [date] "GET /request.php HTTP/1.1" 200 45 "https://www.loadbalancer.com/request.php" PostmanRuntime/7.4.0

loadbalancer.conf

location = /request.php {<br>
  proxy_pass http://backup_servers$request_uri;<br>
  proxy_redirect http://backup_servers$request_uri https://backup_servers$request_uri;
  proxy_set_header Host $host;<br>
  proxy_set_header X-Real-IP $remote_addr;<br>
  proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;<br>

  proxy_method POST;<br>

  proxy_set_header content-type "application/x-www-form-urlencoded";<br>
}

I expect that the method become POST.

Change your proxy_pass and proxy_redirect to be https:// urls. Otherwise you will lose your POST information during the extra redirect. Proxy redirect will use the http location before the https one you specified as well meaning it will always try the http one first.