optionalHeaderValueByName

Description

Optionally extracts the value of the HTTP request header with the given name.

The optionalHeaderValueByName directive is similar to the headerValueByName directive but always extracts an Optional value instead of rejecting the request if no matching header could be found.

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.