String name
) Convenience method for the value for a single valued header. If
there is no header with the provided name, null will be
returned. If the header has more than one value an exception is
thrown.
Source
/**
* Convenience method for the value for a single valued header. If
* there is no header with the provided name, [:null:] will be
* returned. If the header has more than one value an exception is
* thrown.
*/
String value(String name);