value abstract method
String value(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
String value(String name);
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Licensed under the Creative Commons Attribution-ShareAlike License v4.0.
https://api.dartlang.org/stable/1.24.3/dart-io/HttpHeaders/value.html