public async Task <MiddlemanResponse> GetResponseAsync(MiddlemanContext context, MiddlemanRequest request)
{
if (request.Headers.AllKeys.Any(h => h.Equals("VsDebuggerCausalityData", StringComparison.InvariantCultureIgnoreCase)))
{
request.Headers.Remove("VsDebuggerCausalityData");
}
//if (request.Headers.AllKeys.Any(h => h.Equals("SOAPAction", StringComparison.InvariantCultureIgnoreCase)))
//{
// request.Headers.Remove("SOAPAction");
//}
if (request.Headers.AllKeys.Any(
h => h.Equals("Accept-Encoding", StringComparison.InvariantCultureIgnoreCase) && request.Headers[h].Contains("/")))
{
string[] parts = request.Headers["Accept-Encoding"].Split(new[] { ',' }, StringSplitOptions.RemoveEmptyEntries).Where(s => !s.Contains("/")).ToArray();
Log.Debug("Fixed bad [Accept-Encoding] header");
if (parts.Length > 0)
{
request.Headers["Accept-Encoding"] = string.Join(",", parts);
}
else
{
request.Headers.Remove("Accept-Encoding");
}
}
if (request.Headers.AllKeys.Any(
h => h.Equals("Accept-Encoding", StringComparison.InvariantCultureIgnoreCase) && (request.Headers[h].Contains("gzip") || request.Headers[h].Contains("deflate") || request.Headers[h].Contains("sdch"))))
{
string acceptEncodingHeader = (request.Headers["Accept-Encoding"] ?? "").Trim();
Log.Debug("Disabled gzip compression as it is not currently supported.");
if (acceptEncodingHeader.Length > 0)
{
acceptEncodingHeader = acceptEncodingHeader.Replace("gzip", "gzip;q=0").Replace("deflate", "deflate;q=0").Replace("sdch", "sdch;q=0").Replace(";;", ";");
request.Headers["Accept-Encoding"] = acceptEncodingHeader;
}
else
{
acceptEncodingHeader = "gzip;q=0,deflate;q=0,sdch;q=0";
request.Headers["Accept-Encoding"] = acceptEncodingHeader;
}
}
if (RewriteHost)
{
request.Headers["Host"] = _backendUri.Host +
(_backendUri.IsDefaultPort ? string.Empty : ":" + _backendUri.Port);
}
if (AddForwardedForHeader)
{
SetForwardedForHeader(context, request);
}
if (RemoveExpectHeader &&
request.Headers.AllKeys.Any(
h => h.Equals(HttpRequestHeader.Expect.ToString(), StringComparison.InvariantCultureIgnoreCase)))
{
request.Headers.Remove(HttpRequestHeader.Expect);
}
//if (request.Headers.AllKeys.Any(h => h.Equals(HttpRequestHeader.Range.ToString(), StringComparison.InvariantCultureIgnoreCase)))
// request.Headers.Remove(HttpRequestHeader.Range);
//if (request.Headers.AllKeys.Any(h => h.Replace("-","").Equals(HttpRequestHeader.IfRange.ToString(), StringComparison.InvariantCultureIgnoreCase)))
// request.Headers.Remove(HttpRequestHeader.IfRange);
//if (request.Headers.AllKeys.Any(h => h.Replace("-", "").Equals(HttpRequestHeader.IfModifiedSince.ToString(), StringComparison.InvariantCultureIgnoreCase)))
// request.Headers.Remove(HttpRequestHeader.IfModifiedSince);
//if (request.Headers.AllKeys.Any(h => h.Replace("-", "").Equals(HttpRequestHeader.IfMatch.ToString(), StringComparison.InvariantCultureIgnoreCase)))
// request.Headers.Remove(HttpRequestHeader.IfMatch);
//if (request.Headers.AllKeys.Any(h => h.Replace("-", "").Equals(HttpRequestHeader.IfNoneMatch.ToString(), StringComparison.InvariantCultureIgnoreCase)))
// request.Headers.Remove(HttpRequestHeader.IfNoneMatch);
var sw = Stopwatch.StartNew();
IPAddress ip;
if (_backendUri.HostNameType == UriHostNameType.IPv4)
{
ip = IPAddress.Parse(_backendUri.Host);
}
else
{
var ipAddresses = await Dns.GetHostAddressesAsync(_backendUri.Host);
ip = ipAddresses.FirstOrDefault(o => !o.ToString().Contains(":"));
}
var backendEp = new IPEndPoint(ip, _backendUri.Port);
Log.Debug("{0}: Resolved upstream server to {1} in {2}ms, opening connection",
context.InboundConnection.RemoteEndPoint, backendEp, sw.Elapsed.TotalMilliseconds);
if (_backendUri.Scheme != "https")
{
await context.OpenOutboundConnectionAsync(backendEp);
}
else
{
await context.OpenSecureOutboundConnectionAsync(backendEp, _backendUri.Host);
}
Log.Debug("{0}: Outbound connection established, sending request",
context.InboundConnection.RemoteEndPoint);
sw.Restart();
await context.OutboundConnection.WriteRequestAsync(request);
Log.Debug("{0}: Handler sent request in {1}ms", context.InboundConnection.RemoteEndPoint,
sw.Elapsed.TotalMilliseconds);
var response = await context.OutboundConnection.ReadResponseAsync();
return(response);
}