Default HTTP headers to set for requests when not explicitly overridden.
Sends an HTTP request.
The URI to send the message to.
The HTTP method to use.
Optionalsignal: AbortSignalUsed to cancel the request.
Optionalheaders: HeadersInitThe HTTP headers to set.
Optionalbody: BodyInitThe body to send.
Communicates with remote resources using JavaScript's standard Fetch API.