/// <inheritdoc/>
public override async ValueTask <Connection> ConnectAsync(EndPoint endPoint, IConnectionProperties?options = null, CancellationToken cancellationToken = default)
{
string authority = endPoint switch
{
DnsEndPoint dns => Tools.EscapeIdnHost(dns.Host) + ":" + dns.Port.ToString(CultureInfo.InvariantCulture),
IPEndPoint ip4 when ip4.AddressFamily == AddressFamily.InterNetwork => ip4.Address.ToString() + ":" + ip4.Port.ToString(CultureInfo.InvariantCulture),
IPEndPoint ip6 when ip6.AddressFamily == AddressFamily.InterNetworkV6 => "[" + ip6.Address.ToString() + "]:" + ip6.Port.ToString(CultureInfo.InvariantCulture),
null => throw new ArgumentNullException(nameof(endPoint)),
_ => throw new ArgumentException($"{nameof(EndPoint)} is of an unsupported type. Must be one of {nameof(DnsEndPoint)} or {nameof(IPEndPoint)}", nameof(endPoint))
};
byte[] authorityBytes = Encoding.ASCII.GetBytes(authority);
ValueHttpRequest request = (await _httpConnection.CreateNewRequestAsync(_httpVersion, _httpVersionPolicy, cancellationToken).ConfigureAwait(false))
?? throw new Exception($"{nameof(HttpConnection)} in use by {nameof(HttpTunnelConnectionFactory)} has been closed by peer.");
try
{
request.ConfigureRequest(contentLength: null, hasTrailingHeaders: false);
request.WriteConnectRequest(authorityBytes);
await request.FlushHeadersAsync(cancellationToken).ConfigureAwait(false);
bool hasResponse = await request.ReadToFinalResponseAsync(cancellationToken).ConfigureAwait(false);
Debug.Assert(hasResponse);
if ((int)request.StatusCode > 299)
{
throw new Exception($"Connect to HTTP tunnel failed; received status code {request.StatusCode}.");
}
var localEndPoint = new TunnelEndPoint(request.LocalEndPoint, request.RemoteEndPoint);
var stream = new HttpContentStream(request, ownsRequest: true);
return(new HttpTunnelConnection(localEndPoint, endPoint, stream));
}
catch
{
await request.DisposeAsync(cancellationToken).ConfigureAwait(false);
throw;
}
}
protected internal override void WriteConnectRequest(int version, ReadOnlySpan <byte> authority)
{
ThrowIfDisposed(version);
_request.WriteConnectRequest(authority);
}