On behalf of the anti-jenkins error nginx reverse proxy settings are incorrect

Official documents Address:
https://wiki.jenkins.io/display/JENKINS/Running+Jenkins+behind+Nginx

Configuration files directly address it.

This is a subdomain, not using ssl

server {
    listen 80;
    server_name jenkins.domain.tld;
    return 301 https://$host$request_uri;
}
 
server {
    listen 80;
    server_name jenkins.domain.tld;
     
    location / {
      proxy_set_header        Host $host:$server_port;
      proxy_set_header        X-Real-IP $remote_addr;
      proxy_set_header        X-Forwarded-For $proxy_add_x_forwarded_for;
      proxy_set_header        X-Forwarded-Proto $scheme;
 
      # Fix the "It appears that your reverse proxy set up is broken" error.
      proxy_pass          http://127.0.0.1:8080;
      proxy_read_timeout  90;
 
      proxy_redirect      http://127.0.0.1:8080 https://jenkins.domain.tld;
  
      # Required for new HTTP-based CLI
      proxy_http_version 1.1;
      proxy_request_buffering off;
      # workaround for https://issues.jenkins-ci.org/browse/JENKINS-45651
      add_header 'X-SSH-Endpoint' 'jenkins.domain.tld:50022' always;
    }
  }

Here is a subdomain, using ssl

upstream jenkins {
  server 127.0.0.1:8080 fail_timeout=0;
}
 
server {
  listen 80;
  server_name jenkins.domain.tld;
  return 301 https://$host$request_uri;
}
 
server {
  listen 443 ssl;
  server_name jenkins.domain.tld;
 
  ssl_certificate /etc/nginx/ssl/server.crt;
  ssl_certificate_key /etc/nginx/ssl/server.key;
 
  location / {
    proxy_set_header        Host $host:$server_port;
    proxy_set_header        X-Real-IP $remote_addr;
    proxy_set_header        X-Forwarded-For $proxy_add_x_forwarded_for;
    proxy_set_header        X-Forwarded-Proto $scheme;
    proxy_redirect http:// https://;
    proxy_pass              http://jenkins;
    # Required for new HTTP-based CLI
    proxy_http_version 1.1;
    proxy_request_buffering off;
    proxy_buffering off; # Required for HTTP-based CLI to work over SSL
    # workaround for https://issues.jenkins-ci.org/browse/JENKINS-45651
    add_header 'X-SSH-Endpoint' 'jenkins.domain.tld:50022' always;
  }
}

Under path using a domain name with ssl https://domain.com/jenkins/

server {
   # All your server and TLS/certificate settings are up here somewhere
   [...]


   # Nginx configuration specific to Jenkins
   # Note that regex takes precedence, so use of "^~" ensures earlier evaluation
   location ^~ /jenkins/ {

       # Convert inbound WAN requests for https://domain.tld/jenkins/ to 
       # local network requests for http://10.0.0.100:8080/jenkins/
       proxy_pass http://10.0.0.100:8080/jenkins/;
        
       # Rewrite HTTPS requests from WAN to HTTP requests on LAN
       proxy_redirect http:// https://;

       # The following settings from https://wiki.jenkins-ci.org/display/JENKINS/Running+Hudson+behind+Nginx
       sendfile off;

       proxy_set_header   Host             $host:$server_port;
       proxy_set_header   X-Real-IP        $remote_addr;
       proxy_set_header   X-Forwarded-For  $proxy_add_x_forwarded_for;
       proxy_max_temp_file_size 0;

       # This is the maximum upload size
       client_max_body_size       10m;
       client_body_buffer_size    128k;

       proxy_connect_timeout      90;
       proxy_send_timeout         90;
       proxy_read_timeout         90;

       proxy_temp_file_write_size 64k;
 
       # Required for new HTTP-based CLI
       proxy_http_version 1.1;
       proxy_request_buffering off;
       proxy_buffering off; # Required for HTTP-based CLI to work over SSL
 }

Remember to modify the startup parameters
JENKINS_ARGS="--webroot=/var/cache/jenkins/war --httpPort=$HTTP_PORT --ajp13Port=$AJP_PORT --prefix=/jenkins"