Append the given headers
Retrieves the first header value which is associated with the given key.
Optionally returns the first header value associated with a key.
Retrieve all header values associated with the given key.
Retrieve all header keys
Remove any headers with the given keys
Append the given headers, replacing any existing headers having the same keys
Transform the Headers to a Map
Transform the Headers to a Map by ignoring multiple values.
The HTTP headers set.