how to read only headers from response and cancel all the rest using c#?

Question

a server that i want to work with it return 302 Found with some body bytes here is the raw

HTTP/1.1 302 Found
Server: unknown
Date: Sun, 29 Jun 2014 20:12:14 GMT
Content-Type: text/html; charset=utf-8
Connection: close
P3P: CP="CAO PSA OUR"
x-powered-by: 
Set-Cookie: session=604d0bdba04eb54793ec2f3c98b2a37e; path=/
Expires: Thu, 19 Nov 1981 08:52:00 GMT
Cache-Control: no-store, no-cache, must-revalidate, post-check=0, pre-check=0
Pragma: no-cache
Location: www.mysite.com/login.php?session=604d0bdba04eb54793ec2f3c98b2a37e
Vary: Accept-Encoding
Content-Length: 18163

this body bytes i want to cancel it from being downloaded :

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
<head>
<meta http-equiv="X-UA-Compatible" content="IE=edge"/>
///////body bytes about 18kb///////
</html>

here is my code manupulating the response using asynchorous request :

  Dim request As HttpWebRequest = CType(asynchronousResult.AsyncState, HttpWebRequest)


        Dim BYTES_TO_READ As Integer = 0
        Dim buffer = New Byte(BYTES_TO_READ - 1) {}

        Using response As HttpWebResponse = CType(request.EndGetResponse(asynchronousResult), HttpWebResponse)
            Using sm As Stream = response.GetResponseStream()
                Dim totalBytesRead As Integer = 0
                Dim bytesRead As Integer
                Do
                    bytesRead = sm.Read(buffer, totalBytesRead, BYTES_TO_READ - totalBytesRead)
                    totalBytesRead += bytesRead
                Loop While totalBytesRead < BYTES_TO_READ
                request.Abort()
                response.Close()
                sm.Close()
            End Using
        End Using
        Dim s = Encoding.Default.GetString(buffer)
       Console.WriteLine(s)
    Catch ex As WebException
        Exit Sub
    End Try

the output is null but the response is fully downloaded ! and i want to skip this i want only headers and cancel all the rest of the response stream

so is there any method to read only the headers and cancel all the remaning bytes

Answer 1

To read headers you should check response.Headers collection, without calling GetResponseStream. Have you tried this, is entire body downloaded anyway?

Another thing you may try - is to request data using 'HEAD' request. It is specifically designed to retrieve only headers, always without body.

how to read only headers from response and cancel all the rest using c#?

Question

1 answers

solution1
2 2014-06-29 20:31:13

how to read only headers from response and cancel all the rest using c#?

Question

1 answers

solution1 2 2014-06-29 20:31:13

solution1
2 2014-06-29 20:31:13