private static async Task <HttpMessage> Request(string method, Url url, string content, Dictionary <string, string> headers)
{
// resolve DNS
var addrs = await Dns.GetHostAddressesAsync(url.Host);
// extract a IPv4 from the list of available addresses (since tu-chemnitz.de
// is not available through IPv6 yet)
// a more general approach would be to try a request to each address
// in the list in a return the result from the first successfull request
IPAddress ipv4 = null;
foreach (var addr in addrs)
{
if (addr.AddressFamily == AddressFamily.InterNetwork)
{
ipv4 = addr;
break;
}
}
// if there is no IPv4 in the list of addresses for the given host
if (ipv4 == null)
{
throw new ArgumentException("Cannot resolve IPv4 for host: " + url.Host);
}
// construct HTTP request
var request = new HttpMessage(method, url.Host, url.Path + "?" + url.Query, headers, content);
// send TCP request
return(new HttpMessage(await TcpRequest.Do(ipv4, url.Port, request.ToString())));
}
public static async Task <string> Get(Url url)
{
// resolve DNS
var addrs = await Dns.GetHostAddressesAsync(url.Host);
// extract a IPv4 from the list of available addresses (since tu-chemnitz.de
// is not available through IPv6 yet)
// a more general approach would be to try a request to each address
// in the list in a return the result from the first successfull request
IPAddress ipv4 = null;
foreach (var addr in addrs)
{
if (addr.AddressFamily == AddressFamily.InterNetwork)
{
ipv4 = addr;
break;
}
}
// if there is no IPv4 in the list of addresses for the given host
if (ipv4 == null)
{
throw new ArgumentException("Cannot resolve IPv4 for host: " + url.Host);
}
// construct HTTP request
var request = "GET " + url.Path + "?" + url.Query + " HTTP/1.1\n" +
"Host: " + url.Host + "\n" +
"\n";
// send TCP request
// Note: updated TcpRequest implementation to also support IPv6 requests
return(await TcpRequest.Do(ipv4, url.Port, request));
}