Constructs a new Headers instance from a map of strings.
Constructs a new Headers instance from a map of strings. Bear in mind that the map keys are case-insensitive, but you are advised to stick to the canonical capitalisation, which is as given by HeaderName.
Constructs a new Headers instance from a list of headers.
(Since version Since v.0.21.5) Use Empty
Provides support for creating
Headers
instances.