[#boost-urls-static_url-set_host] = xref:boost/urls/static_url/set_host.adoc[boost::urls::static_url::set_host] :relfileprefix: ../../../ :mrdocs: Set the host == Synopsis Declared in `<https://www.github.com/boostorg/url/blob/develop/include/boost/url/static_url.hpp#L376[boost/url/static_url.hpp]>` [source,cpp,subs="verbatim,replacements,macros,-callouts"] ---- xref:boost/urls/static_url.adoc[static_url]& set_host(core::string_view s); ---- == Description Depending on the contents of the passed string, this function sets the host: * If the string is a valid IPv4 address, then the host is set to the address. The host type is `host_type::ipv4`. * If the string is a valid IPv6 address enclosed in square brackets, then the host is set to that address. The host type is `host_type::ipv6`. * If the string is a valid IPvFuture address enclosed in square brackets, then the host is set to that address. The host type is `host_type::ipvfuture`. * Otherwise, the host name is set to the string, which may be empty. Reserved characters in the string are percent‐escaped in the result. The host type is `host_type::name`. In all cases, when this function returns, the URL contains an authority. == Example [,cpp] ---- assert( url( "http://www.example.com" ).set_host( "127.0.0.1" ).buffer() == "http://127.0.0.1" ); ---- == Postconditions [,cpp] ---- this->has_authority() == true ---- == Complexity Linear in `this‐>size() + s.size()`. == Exception Safety Strong guarantee. Calls to allocate may throw. == BNF [,cpp] ---- host = IP-literal / IPv4address / reg-name IP-literal = "[" ( IPv6address / IPvFuture ) "]" reg-name = *( unreserved / pct-encoded / "-" / ".") ---- == Specification * https://en.wikipedia.org/wiki/IPv4[] * https://datatracker.ietf.org/doc/html/rfc4291[] * https://datatracker.ietf.org/doc/html/rfc3986#section-3.2.2[] == Return Value `*this` == Parameters [cols=2] |=== | Name | Description | *s* | The string to set. |=== == See Also xref:boost/urls/static_url/set_encoded_host.adoc[`set_encoded_host`], xref:boost/urls/static_url/set_encoded_host_address.adoc[`set_encoded_host_address`], xref:boost/urls/static_url/set_encoded_host_name.adoc[`set_encoded_host_name`], xref:boost/urls/static_url/set_host_address.adoc[`set_host_address`], xref:boost/urls/static_url/set_host_ipv4.adoc[`set_host_ipv4`], xref:boost/urls/static_url/set_host_ipv6.adoc[`set_host_ipv6`], xref:boost/urls/static_url/set_host_ipvfuture.adoc[`set_host_ipvfuture`], xref:boost/urls/static_url/set_host_name.adoc[`set_host_name`]. [.small]#Created with https://www.mrdocs.com[MrDocs]#