15 lines
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558 B
ReStructuredText
15 lines
No EOL
558 B
ReStructuredText
.. _-optionalHeaderValueByName-java-:
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optionalHeaderValueByName
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=========================
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Description
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-----------
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Optionally extracts the value of the HTTP request header with the given name.
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The ``optionalHeaderValueByName`` directive is similar to the :ref:`-headerValueByName-java-` directive but always extracts
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an ``Optional`` value instead of rejecting the request if no matching header could be found.
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Example
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-------
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.. includecode:: ../../../../code/docs/http/javadsl/server/directives/HeaderDirectivesExamplesTest.java#optionalHeaderValueByName |