2015-05-11 23:05:18 +02:00
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.. _-optionalHeaderValueByName-:
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optionalHeaderValueByName
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=========================
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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: optionalHeaderValueByName
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Description
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-----------
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2015-10-09 15:19:36 +02:00
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Optionally extracts the value of the HTTP request header with the given name.
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2015-05-11 23:05:18 +02:00
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2015-10-09 15:19:36 +02:00
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The ``optionalHeaderValueByName`` directive is similar to the :ref:`-headerValueByName-` directive but always extracts
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2015-05-11 23:05:18 +02:00
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an ``Option`` 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: optionalHeaderValueByName-0
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