Check two Headers field name and field value equality.

Check two Request fields equality.

Check two Response fields equality.

Whether the value is Request or not.

Whether the value is Response or not.

Weather the field is singleton field or not.

Merge two Headers object. The first Headers always takes precedence. When fields conflict, the first Headers takes precedence if it is a singleton field. If it is a list-based field and not empty, it is appended to the first Headers field. Invalid field names and field values are ignored. No destructive operation is performed on the arguments and returns a new Headers object.

Parse the header field value. Split field values by <quoted-string> or <token>.

Safely returns a Response object. Wraps operations that may cause errors and returns a 500 internal server error response if an error occurs.

HTTP request handler.

Header merge options.

Wellknown HTTP field name.

HTTP request method.