With nginx you must provide common http context definitions before they are used, e.g. log_format, resolver, etc. inside of server or location contexts. Use this attribute to set these definitions at the appropriate location.
Declarations
Type
strings concatenated with "\n"Default
""Example
''
resolver 127.0.0.1 valid=5s;
log_format myformat '$remote_addr - $remote_user [$time_local] '
'"$request" $status $body_bytes_sent '
'"$http_referer" "$http_user_agent"';
''