[#HTTPRequest-GetHeader]
= xref:HTTPRequest.adoc[HTTPRequest]::GetHeader
:relfileprefix: ../
:mrdocs:

Look up a request header value.

== Synopsis

Declared in `<httpserver.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
std::optional<std::string>
GetHeader(std::string_view hdr) const;
----

== Return Value

The header value, or nullopt if it is not present.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *hdr*
| The header field‐name to look up.
|===


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