[#boost-urls-static_url-set_zone_id]
= xref:boost.adoc[boost]::xref:boost/urls.adoc[urls]::xref:boost/urls/static_url.adoc[static_url]::set_zone_id
:relfileprefix: ../../../
:mrdocs:

Set the zone ID for an IPv6 address.

== Synopsis

Declared in `<https://www.github.com/boostorg/url/blob/develop/include/boost/url/static_url.hpp#L388[boost/url/static_url.hpp]>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
xref:boost/urls/static_url.adoc[static_url]&
set_zone_id(core::string_view s);
----

== Description

This function sets the zone ID for the host if the host is an IPv6 address. Reserved characters in the string are percent‐escaped in the result.

== Example
[,cpp]
----
assert( u.set_host_ipv6( ipv6_address( "fe80::1" ) ).set_zone_id( "eth0" ).buffer() == "https://[fe80::1%25eth0]" );
----
== Complexity
Linear in `this‐>size()`.

== Exception Safety
Strong guarantee. Calls to allocate may throw.

== Specification
* https://datatracker.ietf.org/doc/html/rfc6874[]

== Return Value

`*this`

== Parameters

[cols=2]
|===
| Name
| Description
| *s*
| The zone ID to set.
|===


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