Hi i am trying to post to login page using tcpclient class . but it says 302 error. same thing i can do using webclient. please suggest where i am missing something. i have already achieved using webclient class. but i have asked to do at lower level. please suggest.
i have tried following
string sPost = "POST http://www.udupikrishnarestaurant.com/ HTTP/1.1\r\n" +
"Host: www.udupikrishnarestaurant.com\r\n" +
"Connection: keep-alive\r\n" +
"Content-Length: 632\r\n" +
"Cache-Control: max-age=0\r\n" +
"Origin: http://www.udupikrishnarestaurant.com \r\n" +
"Upgrade-Insecure-Requests: 1\r\n" +
"User-Agent: Mozilla/5.0 (Windows NT 6.3; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/54.0.2840.99 Safari/537.36 \r\n" +
"Content-Type: application/x-www-form-urlencoded\r\n" +
"Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8 \r\n" +
"Referer: http://www.udupikrishnarestaurant.com/ \r\n" +
"Accept-Encoding: gzip, deflate, br\r\n" +
"Accept-Language: en-US,en;q=0.8\r\n" +
"\r\n" +
"__EVENTTARGET=&__EVENTARGUMENT=&__VIEWSTATE=/wEPDwUKLTM0ODY4NTA5Mg9kFgRmD2QWAgIBDxYCHgdWaXNpYmxlaGQCAQ8WAh4EVGV4dAUOMTgyLjY5LjEwOC4yMTFkGAEFHl9fQ29udHJvbHNSZXF1aXJlUG9zdEJhY2tLZXlfXxYCBQlidG5TdWJtaXQFCWJ0bkZvcmdvdCvBSicNzlFc1g4UTZeO96HhGK8T&__VIEWSTATEGENERATOR=CA0B0334&__EVENTVALIDATION=/wEdAAr0HIr+WBkxh8yUckvqwLD4LqRynaTFa/5Hs7sApa3/2aRDGrH080vTDzQFiILKSswLyPw09K59GBb2rr9Ouzg352npSE7sRexHKIcGFqd4MCl0Pj8zqX34hAcL3lPJ6TZjemWCTRgEB59HPczIGVNwdjb4xzpKucCqKjegIpvFhjzmltaUM7aEAN+g9cP/m13MQ92x/wmKgUDwu+2MEZnSA5KkNGEzQJYQmFWkBWmYqAdLpnM=&ddlFloor=2&txtUserName=test&txtPassword=1234&btnSubmit.x=15&btnSubmit.y=3";
byte[] buf = new byte[1024];
string header = sPost;
var client = new TcpClient();
client.Connect("182.50.132.48", 80);
// send request
var stream = client.GetStream();
var streamReader = new StreamReader(stream);
var streamWriter = new StreamWriter(stream);
streamWriter.Write(header);
streamWriter.Flush();
stream.Flush();
// get response
var response1 = streamReader.ReadLine();
302 is not an error. It is a request for redirection - the form tells you "go there instead", most likely as a result of your login attempt. WebClient handles the redirection, your client doesn't.
There's a lot of HTTP to implement. Unless this is purely an excercise, don't try to write your own HTTP client. Redirection is just the top of the iceberg.