title: client sent invalid header line in Nginx
body: <p>in Nginx error log file , getting error as </p>
  
  <blockquote>
    <p>client sent invalid header line: "LocalDBUser_CREATE|USERNAME: User1"
    while reading client request headers</p>
  </blockquote>
  
  <p>How to fix this issue.</p>
  
  <p>My Nginx Conf file is </p>
  
  <pre><code>#user  nobody;
  worker_processes  1;
  
  #error_log  logs/error.log;
  #error_log  logs/error.log  notice;
  error_log  logs/error.log  info;
  
  pid        logs/nginx.pid;
  
  
  events {
      worker_connections  1024;
  }     
  http {
      include       mime.types;
      default_type  application/octet-stream;
  
      #log_format  main  '$remote_addr - $remote_user [$time_local] "$request" '
      #                  '$status $body_bytes_sent "$http_referer" '
      #                  '"$http_user_agent" "$http_x_forwarded_for"';
  
      #access_log  logs/access.log  main;
  
      sendfile        on;
      #tcp_nopush     on;
  
      #keepalive_timeout  0;
      keepalive_timeout  65;
  
      #gzip  on;
          upstream uic_entry {
      server 127.0.0.1:4005;
          }
  
   server {
          listen       80;
          server_name  xxx.yyy.com;
          underscores_in_headers on;
              large_client_header_buffers 4 16k;
          proxy_next_upstream error timeout invalid_header http_500 http_502 http_503         http_504;
             proxy_redirect off;
              proxy_buffering off;
             proxy_set_header        Host            $host;
              proxy_set_header        X-Real-IP       $remote_addr;
              proxy_set_header        X-Forwarded-For $proxy_add_x_forwarded_for;
              proxy_set_header X-NginX-Proxy true;
               proxy_read_timeout 200;
  
      location / {
          #root   html;
          #index  index.html index.htm;
          #return 503;
                  proxy_pass          http://uic_entry;
      }
  </code></pre>
  
  <p>Please let me know how to fix the error</p>