public static async Task <HeaderSection> CreateNewAsync(string headersString)
{
headersString = HeaderField.CorrectObsFolding(headersString);
var hs = new HeaderSection();
if (headersString.EndsWith(CRLF + CRLF))
{
headersString = headersString.TrimEnd(CRLF, StringComparison.Ordinal);
}
using var reader = new StringReader(headersString);
while (true)
{
var field = reader.ReadLine(strictCRLF: true);
if (field is null)
{
break;
}
hs.Fields.Add(await HeaderField.CreateNewAsync(field).ConfigureAwait(false));
}
ValidateAndCorrectHeaders(hs);
return(hs);
}
private static void ValidateAndCorrectHeaders(HeaderSection hs)
{
// https://tools.ietf.org/html/rfc7230#section-5.4
// Since the Host field - value is critical information for handling a
// request, a user agent SHOULD generate Host as the first header field
// following the request - line.
HeaderField hostToCorrect = null;
foreach (var f in hs.Fields)
{
// if we find host
if (f.Name == "Host")
{
// if host is not first
if (hs.Fields.First().Name != "Host")
{
// then correct host
hostToCorrect = f;
break;
}
}
}
if (hostToCorrect is { })