I need away to disable chaching for my VB.NET code. I've found some hints in C#, but nothing that I can get to work.
Right now, when i send in a request, i'm getting the previous request results.
Here's my code:
Dim responseData As String = ""
Try
Dim cookieJar As New Net.CookieContainer()
Dim hwrequest As Net.HttpWebRequest = Net.WebRequest.Create(URL)
hwrequest.CookieContainer = cookieJar
hwrequest.Accept = "*/*"
hwrequest.AllowAutoRedirect = True
hwrequest.UserAgent = "http_requester/0.1"
hwrequest.Timeout = 60000
hwrequest.Method = method
'hwrequest.CachePolicy = CachePolicy
If hwrequest.Method = "POST" Then
hwrequest.ContentType = "application/x-www-form-urlencoded"
Dim encoding As New Text.ASCIIEncoding() 'Use UTF8Encoding for XML requests
Dim postByteArray() As Byte = encoding.GetBytes(POSTdata)
hwrequest.ContentLength = postByteArray.Length
Dim postStream As IO.Stream = hwrequest.GetRequestStream()
postStream.Write(postByteArray, 0, postByteArray.Length)
postStream.Close()
End If
Dim hwresponse As Net.HttpWebResponse = hwrequest.GetResponse()
If hwresponse.StatusCode = Net.HttpStatusCode.OK Then
Dim responseStream As IO.StreamReader =
New IO.StreamReader(hwresponse.GetResponseStream())
responseData = responseStream.ReadToEnd()
End If
hwresponse.Close()
cookieJar = Nothing
Catch e As Exception
responseData = "An error occurred: " & e.Message
End Try
Return responseData
End Function```
Any help would be appreciated!
Related
I am a beginner in the API ecosystem. I am using VB.NET to call API. Code used for the same given below:
Try
Dim s As HttpWebRequest
Dim enc As UTF8Encoding
Dim postdata As String
Dim postdatabytes As Byte()
Dim jo As New JObject
jo.Add("apiid", objProp.Text7)
jo.Add("apiData", objProp.Text8)
postdata = jo.ToString()
s = HttpWebRequest.Create(objProp.Text6)
enc = New System.Text.UTF8Encoding()
postdatabytes = enc.GetBytes(postdata)
s.Method = "POST"
s.ContentType = "application/json"
s.ContentLength = postdatabytes.Length
s.Headers.Add("user-name", "MjRKQGU1NypQJkxZYVpCdzJZXnpKVENmIXFGQyN6XkI=")
s.Headers.Add("api-key", "UjMhTDZiUlE1MkhMWmM2RkclJXJhWUJTTWZDeHVEeDQ=")
Using stream = s.GetRequestStream()
stream.Write(postdatabytes, 0, postdatabytes.Length)
End Using
Dim result = s.GetResponse()
Dim responsedata As Stream = result.GetResponseStream
Dim responsereader As StreamReader = New StreamReader(responsedata)
Dim xResponse = responsereader.ReadToEnd
Try
Dim opData = JObject.Parse(xResponse)("apiData").ToString
objProp = JsonConvert.DeserializeObject(Of default_prop)(opData)
Catch ex As Exception
End Try
Catch myerror As OracleException
'Status
objProp.Text5 = "500"
'Failure Response Message
objProp.Text11 = "Internal Server Error..."
db_close()
End Try
My issue is that I could not find the proper syntax to retrieve API Response Status Code from the response. Request your guidance
With some small changes on your code you can do the trick as follow:
'....... other code here
Using stream = s.GetRequestStream()
stream.Write(postdatabytes, 0, postdatabytes.Length)
End Using
Dim result As HttpWebResponse = CType(s.GetResponse(), HttpWebResponse)
Console.WriteLine(result.StatusCode)
I have been trying to send an HTTP post to a web service and got this message:
"The 'Content-Type' header must be modified using the appropiat
property or method, Parameter nama:name"
This happens when i try to update a customer with this JSON fotmat :
{"display_name":"john smith","email":"johnsmith#something","company_name":"enterprise"}
This is a part of the code i have been using to connect to the API:
Dim sUrl As String = "https://subscriptions.zoho.com/api/v1/customers"
Dim wHeader As WebHeaderCollection = New WebHeaderCollection()
Dim wRequest As HttpWebRequest = DirectCast(System.Net.HttpWebRequest.Create(sUrl), HttpWebRequest)
wHeader.Clear()
wHeader.Add("Authorization: Zoho-authtoken 7ca5747efb3be868e155e707e679f9f5")
wHeader.Add("X-com-zoho-subscriptions-organizationid: 397080968")
wHeader.Add("Content-Type: application/json;charset=UTF-8")
wRequest.Accept = "application/json"
MsgBox(wHeader.ToString)
wRequest.Headers = wHeader
wRequest.Method = "POST"
Dim postData As String = sw.ToString
MsgBox(postData)
Dim byteArray As Byte() = Encoding.UTF8.GetBytes(postData)
wRequest.ContentLength = byteArray.Length
Dim dataStream As Stream = wRequest.GetRequestStream()
dataStream.Write(byteArray, 0, byteArray.Length)
dataStream.Close()
Dim response As WebResponse = wRequest.GetResponse()
Console.WriteLine(CType(response, HttpWebResponse).StatusDescription)
dataStream = response.GetResponseStream()
Dim reader As New StreamReader(dataStream)
Dim responseFromServer As String = reader.ReadToEnd()
Console.WriteLine(responseFromServer)
LblResponse.Text = sResponse
Console.WriteLine(sResponse)
reader.Close()
dataStream.Close()
response.Close()
Catch ex As Exception
If ex.InnerException IsNot Nothing Then
LblResponse.Text = ex.Message + " >> " + ex.InnerException.ToString()
Else
LblResponse.Text = ex.Message
End If
End Try
any ideas ?
This is driving me insane. I know I have to be close on this. My requests matches a real one as far as I can see except the cookies are a bit different. I appear to be missing the google analytics ones. Not sure if that is the issue or not. I get redirected like I am supposed to but on the redirect page it is asking me to login again. Any help is appreciated. Here is my code:
Private Function eaLogin(ByVal ticker As String, ByVal password As String)
Try
ServicePointManager.Expect100Continue = False
Dim request As HttpWebRequest = httpWebRequest.Create("http://www.empireavenue.com")
request.Credentials = CredentialCache.DefaultCredentials
request.CookieContainer = cookieJar
Dim response As HttpWebResponse = request.GetResponse()
Dim dataStream As Stream = response.GetResponseStream()
Dim reader As New StreamReader(dataStream)
Dim responseFromServer As String = reader.ReadToEnd()
reader.Close()
response.Close()
Dim session As String = ""
ServicePointManager.Expect100Continue = False
'Set the initial parameters
Dim UserID As String = ticker ' Username
Dim PWord As String = HttpUtility.UrlEncode(password) ' Password
Dim domain As String = "https://www.empireavenue.com/user/login/do"
Dim encoding As New System.Text.ASCIIEncoding
' Use the appropriate HTML field names to stuff into the post header
Dim PostData As String = _
"login_username=" & ticker & _
"&login_password=" & PWord
Dim Data() As Byte = encoding.GetBytes(PostData)
' Initialise the request
Dim LoginReq As Net.HttpWebRequest = Net.WebRequest.Create(domain) ' Login location taken from the form action
With LoginReq
.KeepAlive = True
.Method = "POST"
' Note: if the page uses a redirect if will fail
.AllowAutoRedirect = False
.ContentType = "application/x-www-form-urlencoded"
.ContentLength = Data.Length
' Set empty container
.CookieContainer = cookieJar
.Referer = "http://www.empireavenue.com/"
.UserAgent = userAgent
.Accept = "text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8"
.Host = "www.empireavenue.com"
End With
' Add the POST data
Dim SendReq As IO.Stream = LoginReq.GetRequestStream
LoginReq.Headers.Add("Accept-Language", "en-US,en;q=0.5")
LoginReq.Headers.Add("Accept-Encoding", "gzip, deflate")
SendReq.Write(Data, 0, Data.Length)
SendReq.Close()
' Obtain the response
Dim LoginRes As Net.HttpWebResponse = LoginReq.GetResponse()
' Retreive the headers from the request (e.g. the location header)
Dim Redirect As String = LoginRes.Headers("Location")
' Add any returned cookies to the cookie collection
cookieJar.Add(LoginRes.Cookies)
' Move to the redirected page as a GET request...
Dim newUrl As String = ""
If Not (Redirect Is Nothing) Then
If Redirect.StartsWith("http://") Then
newUrl = Redirect
Else
newUrl = "https://www.empireavenue.com" & Redirect
End If
LoginReq = Net.WebRequest.Create(newUrl)
With LoginReq
.KeepAlive = False
.Method = "GET"
.ContentType = "application/x-www-form-urlencoded"
.AllowAutoRedirect = True
.CookieContainer = cookieJar
End With
' Perform the navigate and output the HTML
LoginRes = LoginReq.GetResponse()
Dim sReader As IO.StreamReader = New IO.StreamReader(LoginRes.GetResponseStream)
Dim HTML As String = sReader.ReadToEnd
If HTML.Contains(ticker) Then
MessageBox.Show("yay!")
Return True
Else
MessageBox.Show("no!")
Return False
End If
Else
MessageBox.Show("no too!")
Return False
End If
Catch ex As Exception
MessageBox.Show(ex.Message.ToString)
Return False
End Try
End Function
I couldn't try it on the empirevenue because of the restrictions at work but try this:
Dim tempCookies As CookieContainer
ServicePointManager.Expect100Continue = False
Dim postReq As HttpWebRequest = DirectCast(WebRequest.Create("https://www.empireavenue.com/user/login/do"), HttpWebRequest)
Dim postData As String = "login_username=" & ticker & "&login_password=" & PWord
Dim encoding As New UTF8Encoding
Dim byteData As Byte() = encoding.GetBytes(postData)
postReq.Method = "POST"
postReq.KeepAlive = True
postReq.CookieContainer = tempCookies
postReq.ContentType = "application/x-www-form-urlencoded"
postReq.Referer = "http://www.empireavenue.com/"
postReq.UserAgent = "Mozilla/5.0 (Windows NT 6.1; WOW64; rv:15.0) Gecko/20120427 Firefox/15.0a1"
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
Hope it will work for you
Here's my code that I am using to send as post to the specified URL.
Dim url = "http://www.abc.com/new/process"
Dim data As String = nvc.ToString
Dim postAddress = New Uri(Url)
Dim request = DirectCast(WebRequest.Create(postAddress), HttpWebRequest)
request.Method = "POST"
request.ContentType = "application/json"
Dim postByteData As Byte() = UTF8Encoding.UTF8.GetBytes(data)
request.ContentLength = postByteData.Length
Using postStream As Stream = request.GetRequestStream()
postStream.Write(postByteData, 0, postByteData.Length)
End Using
Using resp = TryCast(request.GetResponse(), HttpWebResponse)
Dim reader = New StreamReader(resp.GetResponseStream())
result.Response = reader.ReadToEnd()
End Using
Now the problem is I don't get any exception here, but the response I'm supposed to get after posting (success or error) is not coming to my end. The URL is fine, I checked it. Am I sending it the right way?
I believe the issue is that ReadToEnd method on StreamReader internally uses the Length property. This will be null if the server doesn't send a length in the http header. Try using memory stream and a buffer instead:
Dim url = "http://my.posturl.com"
Dim data As String = nvc.ToString()
Dim postAddress = New Uri(url)
Dim request As HttpWebRequest = WebRequest.Create(postAddress)
request.Method = "POST"
request.ContentType = "application/json"
Dim postByteData As Byte() = UTF8Encoding.UTF8.GetBytes(data)
request.ContentLength = postByteData.Length
Using postStream As Stream = request.GetRequestStream()
postStream.Write(postByteData, 0, postByteData.Length)
End Using
Using resp = TryCast(request.GetResponse(), HttpWebResponse)
Dim b As Byte() = Nothing
Using stream As Stream = resp.GetResponseStream()
Using ms As New MemoryStream()
Dim count As Integer = 0
Do
Dim buf As Byte() = New Byte(1023) {}
count = stream.Read(buf, 0, 1024)
ms.Write(buf, 0, count)
Loop While stream.CanRead AndAlso count > 0
b = ms.ToArray()
End Using
End Using
Console.WriteLine("Response: " + Encoding.UTF8.GetString(b))
Console.ReadLine()
End Using
Hi am trying to make an application that post data to a joomla login page but the only thing i get back is cookies is not enabled.
Function GetPage(ByVal Url As String) As String
Dim CookieJar As New Net.CookieContainer
Dim enc As Encoding = Encoding.GetEncoding(1252)
Dim Data As Byte() = Nothing
Dim PostData As String = ""
If InStr(Url, "?") <> 0 Then
PostData = Url.Substring(InStr(Url, "?"))
Url = Replace(Url, PostData, "")
Url = Url.TrimEnd("?"c)
Data = enc.GetBytes(PostData)
End If
Dim req As System.Net.HttpWebRequest = CType(Net.WebRequest.Create(Url), Net.HttpWebRequest)
req.AllowAutoRedirect = False
req.ContentType = "application/x-www-form-urlencoded"
req.Method = "POST"
If Not Data Is Nothing Then
If Data.Length > 0 Then
req.ContentLength = Data.Length
Dim newStream As Stream = req.GetRequestStream()
newStream.Write(Data, 0, Data.Length)
newStream.Flush()
newStream.Close()
End If
End If
req.CookieContainer = CookieJar
Dim Response As Net.HttpWebResponse = CType(req.GetResponse(), Net.HttpWebResponse)
Dim ResponseStream As IO.StreamReader = New IO.StreamReader(Response.GetResponseStream(), enc)
Dim Html As String = ResponseStream.ReadToEnd()
Response.Close()
ResponseStream.Close()
Return Html
End Function
How should i do?
Try to set .CookieContainer before writing any data to .GetRequestStream()
Look this sample:
CookieContainer cookies = new CookieContainer();
HttpWebRequest postRequest = (HttpWebRequest)WebRequest.Create(site);
postRequest.CookieContainer = cookies; // note this
postRequest.Method = "POST";
postRequest.ContentType = "application/x-www-form-urlencoded";
using (Stream stream = postRequest.GetRequestStream())
{
stream.Write(buffer, 0, buffer.Length);
}