Syntax: real_ip_header field | X-Real-IP | X-Forwarded-For | pro

Syntax: imap_capabilities extension ...; Default: imap_capabilities

Syntax: auth_request uri | off; Default: auth_request

Syntax: ip_hash; Default: — Context: upstream

Syntax: limit_zone name $variable size;

Syntax: proxy_set_header field value; Default: proxy_set_header

Syntax: proxy_next_upstream error | timeout | invalid_header | http_500

Syntax: fastcgi_catch_stderr string; Default: — Context:

Syntax: aio on | off | threads[=pool];

Syntax: proxy_ssl_server_name on | off; Default: proxy_ssl_server_name