I  tried to implement reverse proxy and workers. But getting above error:

/ etc / nginx / sites-available / default

    #odoo server upstream odoo {

 server 127.0.0.1:8069;

}

upstream odoochat {

 server 127.0.0.1:8072;

}

# http -> https server {

   listen 80;

   server_name 127.0.0.1:8069;

   rewrite ^ (. *) https: // $ host $ 1 permanent;

}

server {

 listen 443;

 server_name 127.0.0.1:8069;

 proxy_read_timeout 720s;

 proxy_connect_timeout 720s;

 proxy_send_timeout 720s;

 # Add Headers for odoo proxy mode

 proxy_set_header X-Forwarded-Host $ host;

 proxy_set_header X-Forwarded-For $ proxy_add_x_forwarded_for;

 proxy_set_header X-Forwarded-Proto $ scheme;

 proxy_set_header X-Real-IP $ remote_addr;

 # SSL parameters

 ssl on;

 ssl_certificate /etc/ssl/nginx/server.crt;

 ssl_certificate_key /etc/ssl/nginx/server.key;

 ssl_session_timeout 30m;

 ssl_protocols TLSv1 TLSv1.1 TLSv1.2;

 ssl_ciphers' ECDHE-RSA-AES128-GCM-SHA256: ECDHE-ECDSA-AES128-GCM-SHA256: ECDHE-RSA-AES256-GCM-SHA384: ECDHE-ECDSA-AES256-GCM-SHA384: DHE-RSA-AES128-GCM- SHA256: DHE-DSS-AES128-GCM-SHA256: kEDH + AESGCM: ECDHE-RSA-AES128-SHA256: ECDHE-ECDSA-AES128-SHA256: ECDHE-RSA-AES128-SHA: ECDHE-ECDSA-AES128-SHA: ECDHE- RSA-AES256-SHA384: ECDHE-ECDSA-AES256-SHA384: ECDHE-RSA-AES256-SHA: ECDHE-ECDSA-AES256-SHA: DHE-RSA-AES128-SHA256: DHE-RSA-AES128-SHA: DHE-DSS- AES128-SHA256: DHE-RSA-AES256-SHA256: DHE-DSS-AES256-SHA: DHE-RSA-AES256-SHA: AES128-GCM-SHA256: AES256-GCM-SHA384: AES128-SHA256: AES256-SHA256: AES128- SHA: AES256-SHA: AES: CAMELLIA: DES-CBC3-SHA :! ANULL :! ENULL :! EXPORT :! DES :! RC4 :! MD5 :! PSK :! AECDH :! EDH-DSS-DES-CBC3-SHA:! EDH-RSA-DES-CBC3-SHA :! KRB5-DES-CBC3-SHA ';

 ssl_prefer_server_ciphers on;

 # log

 access_log /var/log/nginx/odoo.access.log;

 error_log /var/log/nginx/odoo.error.log;

 # Redirect requests to odoo backend server

 location / {

   proxy_redirect off;

   proxy_pass http: // odoo;

 }

 location / longpolling {

     proxy_pass http: // odoochat;

 }

 # common gzip

 gzip_types text / css text / less text / plain text / xml application / xml application / json application / javascript;

 gzip on;

}

odoo-server.conf

     [options]

; This is the password that allows database operations:

admin_passwd = admin

db_host = False

db_port = False

db_user = odoo

db_password = False

addons_path = /usr/lib/python2.7/dist-packages/odoo/addons

[options]

logfile = /var/log/odoo/odoo-server.log

addons_path = / odoo / odoo-server / addons

xmlrpc_port = 8069

proxy_mode = Tru

e workers = 3