headerValueByName

Description

Extracts the value of the HTTP request header with the given name.

If no header with a matching name is found the request is rejected with a MissingHeaderRejection.

If the header is expected to be missing in some cases or to customize handling when the header is missing use the optionalHeaderValueByName directive instead.

Example

TODO: Example snippets for JavaDSL are subject to community contributions! Help us complete the docs, read more about it here: write example snippets for Akka HTTP Java DSL #20466.