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http_address | **Optional.** The host's address. Defaults to "$address$" if the host's `address` attribute is set, "$address6$" otherwise.
http_vhost | **Optional.** The virtual host that should be sent in the "Host" header.
-http_uri | **Optional.** The request URI.
+http_uri | **Optional.** The request URI for GET or POST. Defaults to `/`.
http_port | **Optional.** The TCP port. Defaults to 80 when not using SSL, 443 otherwise.
http_ssl | **Optional.** Whether to use SSL. Defaults to false.
http_sni | **Optional.** Whether to use SNI. Defaults to false.