c# httpwebrequest getResponse() freezes and hangs my program
-
13-09-2020 - |
Question
I was trying to use httpwebrequest to use a rest like service on a remote server and from the first execution itself, my code was hanging the program. Then I tried it as a console application to make sure it has nothing to do with the program itself but no luck!
string credentialsJson = @"{""username"":""test"",
""password"":""test""
}";
int tmp = ServicePointManager.DefaultConnectionLimit;
HttpWebRequest request = (HttpWebRequest)WebRequest.Create(@"https://qrua.com/qr/service" + @"/auth/login");
request.Method = "POST";
request.KeepAlive = true;
request.Timeout = 50000 ;
request.CookieContainer = new CookieContainer();
request.ContentType = "application/json";
try
{
StreamWriter writer = new StreamWriter(request.GetRequestStream());
writer.Write(credentialsJson);
}
catch (Exception e)
{
Console.WriteLine("EXCEPTION:" + e.Message);
}
//WebResponse response = request.GetResponse();
try
{
using (WebResponse response = (HttpWebResponse)request.GetResponse())
{
Console.WriteLine("request:\n" + request.ToString() + "\nresponse:\n" + response.ContentLength);
response.Close();
}
}
catch (Exception e)
{
Console.WriteLine("EXCEPTION: in sending http request:" + " \nError message:" + e.Message);
}
Tried several things from different forums but it doesnt help. Even a simple console app with the above code hangs the console indefinitely! Any help would be great..
Thanks
Solution
You're never closing the StreamWriter
... so I suspect it's not being flushed. Admittedly I'd expect an error from the server instead of just a hang, but it's worth looking at.
Btw, you don't need to close the response and dispose it. Just the using
statement is enough.
OTHER TIPS
There's not much you can do if the remote server is not responding other than defining a Timeout
and catch the exception as you did in order to inform the user that the operation cannot complete because the remote site didn't respond:
var request = (HttpWebRequest)WebRequest.Create("https://qrua.com/qr/service/auth/login");
request.Timeout = 5000;
// If the server doesn't respond within 5 seconds you might catch the timeout exception
using (var response = request.GetResponse())
{
}
If you don't want to freeze the UI you could use the async version: BeginGetResponse
Try specifying request.ContentLength.
Before doing:
StreamWriter writer = new StreamWriter(request.GetRequestStream());
writer.Write(credentialsJson);
Try something like this:
using (MemoryStream stream = new MemoryStream())
{
using (var writer = StreamWriter writer = new StreamWriter(stream))
{
writer.Write(credentialsJson);
writer.Close();
}
request.ContentLength = stream.Length;
}