我想使用httpwebrequest更正拼字错误，
我在代码中放置了正确的标头，但是我无法从服务器接收到消息，所以我不这样做！！
标题：
Post : http://orthographe.reverso.net/RISpellerWS/RestSpeller.svc/v1/CheckSpellingAsXml/language=fra?outputFormat=json&doReplacements=true&interfLang=fr&dictionary=both&spellOrigin=interactive&includeSpellCheckUnits=true&includeExtraInfo=true&isStandaloneSpeller=true
Host: orthographe.reverso.net
User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:68.0) Gecko/20100101 Firefox/68.0
Accept: application/json, text/javascript, */*; q=0.01
Accept-Language: fr,fr-FR;q=0.8,en-US;q=0.5,en;q=0.3
Accept-Encoding: gzip, deflate
Content-Type: text/plain
Created: 01/01/0001 00:00:00
Username: OnlineSpellerWS
Content-Length: 16
Origin: http://www.reverso.net
Connection: keep-alive
Referer: http://www.reverso.net/orthographe/correcteur-francais/
我的代码！
Dim logincookie As CookieContainer
Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12
Dim postData As String = "email=&password=&username=" & TextBox1.Text & "&first_name=&opt_into_one_tap=false"
Dim tempCookies As New CookieContainer
Dim encoding As New UTF8Encoding
Dim byteData As Byte() = encoding.GetBytes(postData)
Dim postReq As HttpWebRequest = DirectCast(WebRequest.Create("https://www.instagram.com/accounts/web_create_ajax/attempt/"), HttpWebRequest)
postReq.Method = "POST"
postReq.KeepAlive = True
postReq.CookieContainer = tempCookies
postReq.ContentType = "application/x-www-form-urlencoded"
postReq.Referer = "https://www.instagram.com/"
'postReq.UserAgent = "User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:68.0) Gecko/20100101 Firefox/68.0"
postReq.ContentLength = byteData.Length
Dim postreqstream As Stream = postReq.GetRequestStream()
postreqstream.Write(byteData, 0, byteData.Length)
postreqstream.Close()
Dim postresponse As HttpWebResponse
postresponse = DirectCast(postReq.GetResponse(), HttpWebResponse)
tempCookies.Add(postresponse.Cookies)
logincookie = tempCookies
Dim postreqreader As New StreamReader(postresponse.GetResponseStream())
Dim thepage As String = postreqreader.ReadToEnd
Dim s As String = thepage