redirect - How to wait until page redirected using httpwebrequest VB.Net -

i have problem when open website protected cloudflare it's return 503 server unavailable it's work fine if open browser such firefox

function url_req(url_web string)     dim request httpwebrequest = directcast(httpwebrequest.create(url_web), httpwebrequest)     using webresponse httpwebresponse = directcast(request.getresponse(), httpwebresponse)         dim responsestream stream = webresponse.getresponsestream()         dim html string = reader.readtoend()         return html     end using end function 

it's have wait 5 seconds before redirected original page

is there solution ? or have use webbrowser function ?

it sounds site owner has turned on i'm under attack mode mitigate ddos attack, or you're doing making lot of requests site make attack.