:relfileprefix: ../../../
[#boost-urls-param-key]

= xref:boost.adoc[pass:[boost]]::xref:boost/urls.adoc[pass:[urls]]::xref:boost/urls/param.adoc[pass:[param]]::key


The key


== Synopsis

Declared in header `<https://www.github.com/boostorg/url/blob/develop/include/boost/url/param.hpp#L85[boost/url/param.hpp,window=blank_]>`

[source,cpp,subs="verbatim,macros,-callouts"]
----
xref:std.adoc[std]::string key;
----

== Description


For most usages, key comparisons are
case-sensitive and duplicate keys in
a query are possible. However, it is
the authority that has final control
over how the query is interpreted.