Adds a header.
The header key.
The header value.
Clears the headers.
Gets a header value.
The header key.
The header value.
Determines whether or not the indicated header exists in the collection.
The header key to check.
True if it exists, false otherwise.
This API is in preview and not ready for production use. Expect breaking changes in the future. Represents http request/response headers. This is a subset of the Aurelia Headers class.