2015-05-11 23:05:18 +02:00
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.. _-optionalHeaderValuePF-:
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optionalHeaderValuePF
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=====================
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Calls the specified partial function with the first request header the function is ``isDefinedAt`` and extracts the
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result of calling the function.
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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: optionalHeaderValuePF
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Description
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-----------
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The ``optionalHeaderValuePF`` directive is similar to the ``headerValuePF`` 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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