The request or target URL the method is to be retrieved from, unless overridden by init
Optionalinit: RequestInit
The request options the method is to be retrieved from, taking precedence over input
The name of the method stated by init or by input, defaulting to GET, uppercased if it names one of
the methods fetch case-normalises
Retrieves the method of a request.
A method name is case-sensitive, so an extension method is reported exactly as stated and only the standard names
fetchnormalises are folded to uppercase: what is reported is the method the origin server is asked for, so it compares directly against the standard names without ever misreporting an extension method defined in lowercase.