2015-05-11 23:05:18 +02:00
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.. _-optionalHeaderValue-:
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optionalHeaderValue
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===================
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Traverses the list of request headers with the specified function and extracts the first value the function returns as
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``Some(value)``.
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Signature
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---------
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2015-06-19 15:35:24 +02:00
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.. includecode2:: /../../akka-http/src/main/scala/akka/http/scaladsl/server/directives/HeaderDirectives.scala
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2015-05-11 23:05:18 +02:00
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:snippet: optionalHeaderValue
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Description
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-----------
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The ``optionalHeaderValue`` directive is similar to the ``headerValue`` directive but always extracts an ``Option``
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value instead of rejecting the request if no matching header could be found.
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2015-10-01 13:25:41 +02:00
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Example
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-------
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.. includecode2:: ../../../../code/docs/http/scaladsl/server/directives/HeaderDirectivesExamplesSpec.scala
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:snippet: optionalHeaderValue-0
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