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<h1 class='fqn'><span class='in-band'>Function <a href='index.html'>mailparse</a>::<wbr><a class='fn' href=''>parse_header</a></span><span class='out-of-band'><span id='render-detail'>
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<pre class='rust fn'>pub fn parse_header(raw_data: <a class='primitive' href='https://doc.rust-lang.org/nightly/std/primitive.slice.html'>&[</a><a class='primitive' href='https://doc.rust-lang.org/nightly/std/primitive.u8.html'>u8</a><a class='primitive' href='https://doc.rust-lang.org/nightly/std/primitive.slice.html'>]</a>) -> <a class='enum' href='https://doc.rust-lang.org/nightly/core/result/enum.Result.html' title='core::result::Result'>Result</a><<a class='primitive' href='https://doc.rust-lang.org/nightly/std/primitive.tuple.html'>(</a><a class='struct' href='../mailparse/struct.MailHeader.html' title='mailparse::MailHeader'>MailHeader</a>, <a class='primitive' href='https://doc.rust-lang.org/nightly/std/primitive.usize.html'>usize</a><a class='primitive' href='https://doc.rust-lang.org/nightly/std/primitive.tuple.html'>)</a>, <a class='enum' href='../mailparse/enum.MailParseError.html' title='mailparse::MailParseError'>MailParseError</a>></pre><div class='docblock'><p>Parse a single header from the raw data given.
This function takes raw byte data, and starts parsing it, expecting there
to be a MIME header key-value pair right at the beginning. It parses that
header and returns it, along with the index at which the next header is
expected to start. If you just want to parse a single header, you can ignore
the second component of the tuple, which is the index of the next header.
Error values are returned if the data could not be successfully interpreted
as a MIME key-value pair.</p>
<h1 id='examples' class='section-header'><a href='#examples'>Examples</a></h1>
<pre class='rust rust-example-rendered'>
<span class='kw'>use</span> <span class='ident'>mailparse</span>::<span class='ident'>parse_header</span>;
<span class='kw'>let</span> (<span class='ident'>parsed</span>, _) <span class='op'>=</span> <span class='ident'>parse_header</span>(<span class='macro'>concat</span><span class='macro'>!</span>(
<span class='string'>"Subject: Hello, sir,\n"</span>,
<span class='string'>" I am multiline\n"</span>,
<span class='string'>"Next:Header"</span>).<span class='ident'>as_bytes</span>())
.<span class='ident'>unwrap</span>();
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>parsed</span>.<span class='ident'>get_key</span>().<span class='ident'>unwrap</span>(), <span class='string'>"Subject"</span>);
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>parsed</span>.<span class='ident'>get_value</span>().<span class='ident'>unwrap</span>(), <span class='string'>"Hello, sir, I am multiline"</span>);</pre>
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