protected override WebRequest GetWebRequest(Uri address)
{
HttpWebRequest request;
if (_proxy == null)
{
request = base.GetWebRequest(address) as HttpWebRequest;
}
else
{
switch (_proxy.Type)
{
case NetProxyType.Http:
request = base.GetWebRequest(address) as HttpWebRequest;
request.Proxy = _proxy.HttpProxy;
break;
case NetProxyType.Socks5:
_proxyRequestHandler = _proxy.SocksProxy.Connect(address.Host, address.Port);
if (address.Scheme == "https")
{
IWebProxy httpProxy = _proxyRequestHandler.CreateLocalHttpProxyConnectTunnel();
request = base.GetWebRequest(address) as HttpWebRequest;
request.Proxy = httpProxy;
}
else
{
IPEndPoint localTunnelEP = _proxyRequestHandler.CreateLocalTunnel();
Uri proxyUri = new Uri("http://" + localTunnelEP.Address.ToString() + ":" + localTunnelEP.Port + address.PathAndQuery);
request = base.GetWebRequest(proxyUri) as HttpWebRequest;
request.Host = address.Host;
}
break;
default:
throw new NotSupportedException("Proxy type not supported.");
}
}
if (_timeout > 0)
{
request.Timeout = _timeout;
}
request.CookieContainer = _cookie;
if (_ifModifiedSince > (new DateTime()))
{
request.IfModifiedSince = _ifModifiedSince;
}
if (_userAgent != null)
{
request.UserAgent = _userAgent;
}
request.KeepAlive = _keepAlive;
request.AllowAutoRedirect = false;
foreach (KeyValuePair <string, string> header in _headers)
{
switch (header.Key.ToLower())
{
case "accept":
request.Accept = header.Value;
break;
case "connection":
request.KeepAlive = (header.Value.ToLower() == "keep-alive");
break;
case "content-type":
request.ContentType = header.Value;
break;
case "user-agent":
request.UserAgent = header.Value;
break;
default:
request.Headers.Add(header.Key, header.Value);
break;
}
}
return(request);
}
protected override WebRequest GetWebRequest(Uri address)
{
HttpWebRequest request = null;
if (_proxy == null)
{
switch (_networkType)
{
case WebClientExNetworkType.IPv4Only:
if (IPAddress.TryParse(address.Host, out IPAddress ipv4))
{
if (ipv4.AddressFamily != System.Net.Sockets.AddressFamily.InterNetwork)
{
throw new WebException("WebClientEx current network type does not allow url address family: " + ipv4.AddressFamily.ToString());
}
request = base.GetWebRequest(address) as HttpWebRequest;
}
else
{
try
{
DnsClient dns = new DnsClient();
IPAddress[] ipAddresses = dns.ResolveIP(address.Host);
if (ipAddresses.Length == 0)
{
throw new WebException("WebClientEx could not resolve IPv4 address for host: " + address.Host);
}
foreach (IPAddress ipAddress in ipAddresses)
{
if (ipAddress.AddressFamily == System.Net.Sockets.AddressFamily.InterNetwork)
{
Uri newAddress = new Uri(address.Scheme + "://" + ipAddress.ToString() + ":" + address.Port + address.PathAndQuery);
request = base.GetWebRequest(newAddress) as HttpWebRequest;
request.Host = address.Host;
break;
}
}
}
catch (DnsClientException ex)
{
throw new WebException("WebClientEx could not resolve IPv4 address for host: " + address.Host, ex);
}
if (request == null)
{
throw new WebException("WebClientEx could not resolve IPv4 address for host: " + address.Host);
}
}
break;
case WebClientExNetworkType.IPv6Only:
if (IPAddress.TryParse(address.Host, out IPAddress ipv6))
{
if (ipv6.AddressFamily != System.Net.Sockets.AddressFamily.InterNetworkV6)
{
throw new WebException("WebClientEx current network type does not allow url address family: " + ipv6.AddressFamily.ToString());
}
request = base.GetWebRequest(address) as HttpWebRequest;
}
else
{
try
{
DnsClient dns = new DnsClient(true);
IPAddress[] ipAddresses = dns.ResolveIP(address.Host, true);
if (ipAddresses.Length == 0)
{
throw new WebException("WebClientEx could not resolve IPv6 address for host: " + address.Host);
}
foreach (IPAddress ipAddress in ipAddresses)
{
if (ipAddress.AddressFamily == System.Net.Sockets.AddressFamily.InterNetworkV6)
{
Uri newAddress = new Uri(address.Scheme + "://[" + ipAddress.ToString() + "]:" + address.Port + address.PathAndQuery);
request = base.GetWebRequest(newAddress) as HttpWebRequest;
request.Host = address.Host;
break;
}
}
}
catch (DnsClientException ex)
{
throw new WebException("WebClientEx could not resolve IPv6 address for host: " + address.Host, ex);
}
if (request == null)
{
throw new WebException("WebClientEx could not resolve IPv6 address for host: " + address.Host);
}
}
break;
default:
request = base.GetWebRequest(address) as HttpWebRequest;
break;
}
}
else
{
switch (_proxy.Type)
{
case NetProxyType.Http:
request = base.GetWebRequest(address) as HttpWebRequest;
request.Proxy = _proxy.HttpProxy;
break;
case NetProxyType.Socks5:
_proxyRequestHandler = _proxy.SocksProxy.Connect(address.Host, address.Port);
if (address.Scheme == "https")
{
IWebProxy httpProxy = _proxyRequestHandler.CreateLocalHttpProxyConnectTunnel();
request = base.GetWebRequest(address) as HttpWebRequest;
request.Proxy = httpProxy;
}
else
{
IPEndPoint localTunnelEP = _proxyRequestHandler.CreateLocalTunnel();
Uri proxyUri = new Uri("http://" + localTunnelEP.Address.ToString() + ":" + localTunnelEP.Port + address.PathAndQuery);
request = base.GetWebRequest(proxyUri) as HttpWebRequest;
request.Host = address.Host;
}
break;
default:
throw new NotSupportedException("Proxy type not supported.");
}
}
if (_timeout > 0)
{
request.Timeout = _timeout;
}
request.CookieContainer = _cookie;
if (_ifModifiedSince > (new DateTime()))
{
request.IfModifiedSince = _ifModifiedSince;
}
if (_userAgent != null)
{
request.UserAgent = _userAgent;
}
request.KeepAlive = _keepAlive;
request.AllowAutoRedirect = false;
foreach (KeyValuePair <string, string> header in _headers)
{
switch (header.Key.ToLower())
{
case "accept":
request.Accept = header.Value;
break;
case "connection":
request.KeepAlive = (header.Value.ToLower() == "keep-alive");
break;
case "content-type":
request.ContentType = header.Value;
break;
case "user-agent":
request.UserAgent = header.Value;
break;
default:
request.Headers.Add(header.Key, header.Value);
break;
}
}
return(request);
}