[#9616326F0BF29671BF89E8869B255FC84C4DDDDC]

<div id="9616326F0BF29671BF89E8869B255FC84C4DDDDC">
    <div>
        <h2>Function <a href="#">url_base</a>::
set_host</h2>
        <p><span>Set the host</span></p>


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    <div>
        <h3>Synopsis</h3>
        <div>
            <code>
                            </code>
        </div>
        <pre class="source-code cpp">
            url_base&
set_host(core::string_view s);
        </pre>
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    <div>
        <h3>Description</h3>
        <p><span>Depending on the contents of the passed</span> <span>string, this function sets the host:</span></p>

<li><span>If the string is a valid IPv4 address,</span>
<span>then the host is set to the address.</span>
<span>The host type is</span>
<span>host_type::ipv4</span>
<span>.</span></li>
<li><span>If the string is a valid IPv6 address</span>
<span>enclosed in square brackets, then the</span>
<span>host is set to that address.</span>
<span>The host type is</span>
<span>host_type::ipv6</span>
<span>.</span></li>
<li><span>If the string is a valid IPvFuture</span>
<span>address enclosed in square brackets, then</span>
<span>the host is set to that address.</span>
<span>The host type is</span>
<span>host_type::ipvfuture</span>
<span>.</span></li>
<li><span>Otherwise, the host name is set to</span>
<span>the string, which may be empty.</span>
<span>Reserved characters in the string are</span>
<span>percent-escaped in the result.</span>
<span>The host type is</span>
<span>host_type::name</span>
<span>.</span></li>
<p><span>In all cases, when this function returns,</span>
<span>the URL contains an authority.</span></p>

<h3>Example</h3>
<code>
assert( url( "http://www.example.com" ).set_host( "127.0.0.1" ).buffer() == "http://127.0.0.1" );
</code>
<h3>Postconditions</h3>
<code>
this->has_authority() == true
</code>
<h3>Complexity</h3>
<p><span>Linear in `this->size() + s.size()`.</span></p>

<h3>Exception Safety</h3>
<p><span>Strong guarantee.</span>
<span>Calls to allocate may throw.</span></p>

<h3>BNF</h3>
<code>
host        = IP-literal / IPv4address / reg-name

IP-literal  = "[" ( IPv6address / IPvFuture  ) "]"

reg-name    = *( unreserved / pct-encoded / "-" / ".")
</code>
<h3>Specification</h3>
<li><a href="https://en.wikipedia.org/wiki/IPv4">IPv4 (Wikipedia)</a></li>
<li><a href="https://datatracker.ietf.org/doc/html/rfc4291">IP Version 6 Addressing Architecture (rfc4291)</a></li>
<li><a href="https://datatracker.ietf.org/doc/html/rfc3986#section-3.2.2">            3.2.2. Host (rfc3986)</a></li>

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