headerValues method
Header values
Returns an iterator to the values of the HTTP headers that will be added
to the HTTP response with name
.
The name is case-insensitive. The name is considered the same, whether it is represented using uppercase or lowercase letters.
Returns null if no headers exist with the name.
Implementation
Iterable<String>? headerValues(String name) =>
_headers[_headerCanonicalName(name)];