PayPal IPN Simulator Bad Request

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I´m trying to test my IPN listener with the IPN simulator, but I´m always getting "Bad Request" error.

I´ve already see this answers:

PayPal IPN Bad Request 400 Error Paypal SandBox IPN always returns INVALID

For my web I´m using the code you can find here: http://ift.tt/Wdpz2B

Thinking in the others answers, maybe there is something wrong in this code, but I don´t know what, if there is something wrong:

HttpWebRequest webRequest = (HttpWebRequest)WebRequest.Create(url);                 
webRequest.Method = "POST";                 
webRequest.ContentType = "application/x-www-form-urlencoded";

//must keep the original intact and pass back to PayPal with a _notify-validate command
string data = Encoding.ASCII.GetString(parameters);                 
data += "&cmd=_notify-validate";   

webRequest.ContentLength = data.Length;                   

//Send the request to PayPal and get the response                 
using (StreamWriter streamOut = new StreamWriter(webRequest.GetRequestStream(),System.Text.Encoding.ASCII))                 
{                     
    streamOut.Write(data);                     
    streamOut.Close();                 
 }      

I´ve thought in this code section, because I saw that the other asnwers was solved with the header of the request, but I don´t know if this code is correct or not for PayPal. I´ve already seen the paypal code examples, but all of them are with VB or webforms.

Thank you for your help.

Note: I have my app in a server to test it, I´m not trying to call my localhost from the IPN simulator.

asked 28 secs ago

user2201880

1

PayPal IPN Simulator Bad Request