23 lines
1.1 KiB
ReStructuredText
23 lines
1.1 KiB
ReStructuredText
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.. _-headerValue-java-:
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headerValue
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===========
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Description
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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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``Optional[value]``.
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The :ref:`-headerValue-java-` directive is a mixture of ``map`` and ``find`` on the list of request headers. The specified function
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is called once for each header until the function returns ``Optional(value)``. This value is extracted and presented to the
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inner route. If the function throws an exception the request is rejected with a ``MalformedHeaderRejection``. If the
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function returns ``Optional.empty`` for every header the request is rejected as "NotFound".
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This directive is the basis for building other request header related directives.
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See also :ref:`-headerValuePF-java-` for a nicer syntactic alternative.
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Example
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-------
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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 <https://github.com/akka/akka/issues/20466>`_.
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