I'm getting a lot of this error in my logs:

odoo.http: , /longpolling/poll: Function declared as capable of handling request of type 'json' but called with a request of type 'http'

This seems to have started all of a sudden. I've tried editing the nginx config, but nothing seems to help.

Have anybody else experienced this error?

Odoo config:

[options]
admin_passwd = password
db_host = False
db_port = False
db_user = odoo
db_password = password
dbfilter = dbname
addons_path = /usr/lib/python2.7/dist-packages/odoo/addons
addons_path = /odoo/enterprise,/odoo/odoo-server/addons,/odoo/custom/themes,/odoo/custom/addons,/odoo/custom/modules
logfile = /var/log/odoo/odoo-server.log
logrotate = True
xmlrpc_interface = 127.0.0.1
xmlrpc_port = 8069
longpolling_port = 8072
proxy_mode = True
workers = 8
limit_memory_hard = 1677721600
limit_memory_soft = 629145600
limit_time_cpu = 600
limit_time_real = 1200
max_cron_threads = 1

Nginx config:

# workaround for nginx's inability to escape the $ character. see:
# https://openresty.org/download/agentzh-nginx-tutorials-en.html#nginx-variables-escaping-dollar
geo $dollar {
        default "$";
}
upstream odoo {
        server 127.0.0.1:8069 weight=1 fail_timeout=0;
}
upstream odoo-im {
        server 127.0.0.1:8072 weight=1 fail_timeout=0;
}
# Proxy Headers
proxy_set_header        Host            $host;
proxy_set_header        X-Forwarded-Host $host;
proxy_set_header        X-Real-IP       $remote_addr;
proxy_set_header        X-Forward-For   $proxy_add_x_forwarded_for;
proxy_set_header        X-Forward-Proto $scheme;
# General Proxy Config
        proxy_connect_timeout 3600s;
        proxy_send_timeout 3600s;
        proxy_read_timeout 3600s;
        proxy_next_upstream error timeout invalid_header http_500 http_502 http_503 http_504;
# Increase Proxy buffer to handle large Odoo web requests
        proxy_buffers 16 64k;
        proxy_buffer_size 128k;
# Redirect www. to bare domain
server {
        listen 80;
        server_name www.domain.com;
        return 301 http://domain.com$request_uri;
}
server {
        listen 443 ssl;
        ssl_certificate /etc/nginx/ssl/domain.com.chained.crt;
        ssl_certificate_key /etc/nginx/ssl/domain.com.key;
        server_name www.domain.com;
        return 301 https://domain.com$request_uri;
}
server {
        listen 80;
        server_name domain.com;
        # Log file locations
        access_log      /var/log/nginx/domain.access.log;
        error_log       /var/log/nginx/domain.error.log;
	#Redirect non-POS and related content in https to allow POS in http
        location ~ ^(?!/pos/|/web/binary/company_logo|/aspl_pos_prod_operation/static/|/?[^/]*/website/action/|/web/webclient/|/web/content/|/web_editor/static/|/web/css/|/web/static/|/point_of_sale/static).*$ {
                proxy_redirect off;
                if ($request_method != POST) {
                        # rewriting a POST request has no sense as the browser will do the request as GET
                        rewrite ^(.*)$ https://$host$1 permanent;
                }
                if ($request_method = POST) {
                        proxy_pass http://odoo;
                }
        }
        location = /longpolling/poll {
                proxy_redirect off;
                proxy_pass http://odoo-im;
        }
	location / {
                proxy_redirect off;
                proxy_pass http://odoo;
        }
}
server {
        listen 443 ssl;
        server_name    domain.com;
        # Log file locations
        access_log      /var/log/nginx/domain.access.log;
        error_log       /var/log/nginx/domain.error.log;
        # Enable SSL
        ssl on;
        ssl_certificate /etc/nginx/ssl/domain.com.chained.crt;
        ssl_certificate_key /etc/nginx/ssl/domain.com.key;
        ssl_session_timeout     30m;
        keepalive_timeout       600;
        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_protocols   SSLv3 TLSv1 TLSv1.1 TLSv1.2;
        ssl_prefer_server_ciphers on;
	# Increase maximum accepted body size
        client_max_body_size 512m;
        # Increase Proxy buffer to handle large Odoo web requests
        proxy_buffers 16 64k;
        proxy_buffer_size 128k;
        # General Proxy Config
        proxy_connect_timeout 3600s;
        proxy_send_timeout 3600s;
        proxy_read_timeout 3600s;
        proxy_next_upstream error timeout invalid_header http_500 http_502 http_503 http_504;
        # Default Settings
        proxy_redirect off;
        proxy_buffering off;
	
        # Enable gzip
        gzip_types text/css text/less text/plain image/svg+xml text/xml application/xml application/json application/x-font-ttf font/opentype application/javascript application/xhtml+xml;
        gzip on;
        location /images {
                root /var/www;
		autoindex on;
        }
        # Redirect POS to http
        location ~ ^/pos/ {
                rewrite ^(.*)$ http://$host:80$1 permanent;
        }
        location /longpolling {
                proxy_redirect off;
                proxy_pass http://odoo-im;
        }
        location / {
                proxy_redirect off;
                proxy_pass http://odoo;
        }
        # cache some static data in memory for 60 mins.
        location ~* ^/(openerp|openobject|web)/static/ {
                proxy_cache_valid 200 60m;
                proxy_buffering on;
                expires 864000;
                proxy_pass http://odoo;
        }
}