client sent invalid header line in Nginx

in Nginx error log file , getting error as client sent invalid header line: "LocalDBUser_CREATE|USERNAME: User1" while reading client request headers How to fix this issue. My Nginx Conf file is ``` #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; } ``` Please let me know how to fix the error