[#boost-urls-param-key]
= xref:boost.adoc[boost]::xref:boost/urls.adoc[urls]::xref:boost/urls/param.adoc[param]::key
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:mrdocs:

The key

== Synopsis

Declared in `&lt;https://www.github.com/boostorg/url/blob/develop/include/boost/url/param.hpp#Lundefined[boost&sol;url&sol;param&period;hpp]&gt;`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
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std::string key;
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== Description

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


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