I'm trying to send an HTTP command using VB.NET and I'm not quite sure how to do it. I don't want to actually navigate to the page, just execute the command.
http://xbmc.local/xbmcCmds/xbmcHttp?command=ExecBuiltIn¶meter=XBMC.updatelibrary%28video%29
What I'm doing is building an integrated interface for my XBMC home theater, and my home automation.
You can use the WebRequest object to send an HTTP Request.
' Create a WebRequest object with the specified url. '
Dim myWebRequest As WebRequest = WebRequest.Create(url)
' Send the WebRequest and wait for response. '
Dim myWebResponse As WebResponse = myWebRequest.GetResponse()
The WebResponse class has a number of properties you can check to see if the request succeeded or not. And just something to be aware of, GetResponse() will throw an exception if it times out.
Try the following
Dim client = WebRequest.Create("http://xbmc.local/xbmcCmds/xbmcHttp?command=ExecBuiltIn¶meter=XBMC.updatelibrary%28video%29")
Dim response = client.GetResponse()
Related
Using server integration and .net, I post the original request to SagePay and get the NextURL fine, and so go to the payment pages... step through them OK, but then I get the error:
Server error 5006: Unable to redirect to Vendor's web site. The Vendor failed to provide a RedirectionURL.
HTTP error 500: The request was unsuccessful due to an unexpected condition encountered by the server.
But I am sending a RedirectionURL (though the docs call is RedirectURL, which is somewhat confusing - anyway, I've tried using both. This si what I'm sending back from my NotificatioURL - what's wrong?
Dim sb As New StringBuilder
sb.Append("Status=OK")
sb.Append("&StatusDetail=Fine")
sb.Append("&RedirectURL=https://mydomain.co.uk/sagepay.aspx")
Dim urlTEST As String = "https://test.sagepay.com/gateway/service/vspserver-register.vsp"
Dim urlLIVE As String = "https://live.sagepay.com/gateway/service/vspserver-register.vsp"
Try
Dim data As Byte() = Encoding.UTF8.GetBytes(sb.ToString)
Dim request As WebRequest = WebRequest.Create(urlTEST)
request.Method = "POST"
request.ContentType = "application/x-www-form-urlencoded"
request.ContentLength = data.Length
ServicePointManager.ServerCertificateValidationCallback = AddressOf ValidateRemoteSSLCertificate
ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12
Dim stream = request.GetRequestStream()
stream.Write(data, 0, data.Length)
stream.Close()
Dim response As WebResponse = request.GetResponse()
response.Close()
Catch ex As Exception
'log error
End Try
Update: I gather this POST (unlike the initial one with the basket info) requires that the data be sent plain text key-value pairs separated by CrLf's, so I amended this to
Dim sb As New StringBuilder
sb.AppendLine("Status=OK")
sb.AppendLine("StatusDetail=Fine")
sb.Append("RedirectURL=https://mydomain.co.uk/sagepay.aspx")
but it still fails with the same errors. I also tried using, instead of the WebRequst class, the simpler:
Dim client As WebClient = New WebClient()
Dim reply As String = client.UploadString(urlTEST, sb.ToString)
But still no joy. Also tried changing the request.ContentType to "text/plain", but nope.
Come on, someone, please - this si basic to the their operations, someone must have done it....
Blimey - it never pays to be clever. This script doesn't require WebRequest or anything, just write to the simple Response object. Sigh.. as Linus said ....
In my code I'm sending a HttpWebRequest to a page in my website.
When request sends to this page, It doesn't maintain the Session values.
Below is the code, from where I'm generating the web request:
Public Overloads Shared Function ReadURL(ByVal sUrl As String) As String
Dim sBody As String
Dim oResponse As HttpWebResponse
Dim oRequest As HttpWebRequest
Dim oCookies As New CookieContainer
oRequest = WebRequest.Create("http://localhost:64802/inventory/purchase_order.aspx?id=5654")
oRequest.CookieContainer = oCookies
oResponse = oRequest.GetResponse()
Dim oReader As New StreamReader(oResponse.GetResponseStream())
sBody = oReader.ReadToEnd
oReader.Close()
oResponse.Close()
Return sBody
End Function
Below is the code written on Page_Load of Purchaseorder.aspx.vb:
iDomains_ID = Session("Domains_ID")
iLogin_ID = Session("Login_ID")
sPage = Request.Path
If Request.QueryString.Count > 0 Then sPage &= "?" & Request.QueryString.ToString()
sPage = shared01.Encrypt(sPage, Application("PK"))
If Not User.Identity.IsAuthenticated Or iLogin_ID = 0 Then
Response.Redirect("/login.aspx?page=" & sPage)
Exit Sub
End If
Above code doesn't gets the session values and it redirects to the login page.
So, how i can maintain the session on both pages during HttpWebRequest.
Looking for your replies.
EDIT
I've tried to use CookieContainer class as you can see in above code. But it doesn't work at all.
As an alternative, assuming the calling and called pages are in the same application, you could use the Server.Execute method to load the content of the page without making a separate request to the site:
Public Overloads Function ReadURL(ByVal sUrl As String) As String
Using writer As New StringWriter()
Server.Execute("~/inventory/purchase_order.aspx?id=5654", writer, False)
Return writer.ToString()
End Using
End Function
If I've understood you correctly, you're making a request from one page in your site to another, and you want to send the cookies from the current HttpRequest with your WebRequest?
In that case, you'll need to manually copy the cookies to the CookieContainer:
For Each key As String In Request.Cookies.AllKeys
Dim sourceCookie As HttpCookie = Request.Cookies(key)
Dim destCookie As New Cookie(sourceCookie.Name, sourceCookie.Value, sourceCookie.Path, "localhost")
destCookie.Expires = sourceCookie.Expires
destCookie.HttpOnly = sourceCookie.HttpOnly
destCookie.Secure = sourceCookie.Secure
oCookies.Add(destCookie)
Next
NB: You'll either need to make the ReadUrl function non-Shared, or pass the current HttpRequest as a parameter.
You'll also need to make sure the calling page has EnableSessionState="false" in the <%# Page ... %> directive, otherwise the page you're calling will hang trying to obtain the session lock.
Your code seems like you will need to make a request and a post. The first request will redirect you to your login page. The second will be a request where you post to the login page, which will start the session and (?) store information into the session variables. That post (to the login page) will then redirect you to the page you want.
I used code in this example http://www.codeproject.com/Articles/145122/Fetching-ASP-NET-authenticated-page-with-HTTPWebRe (I tweaked it a bit) to write an application to do this.
I generated a proxy class given a URL to a WSDL.
I need to let the end-user change the service's URL to his specific URL, like this:
ServiceProxy.Url = [URL set by end-user];
The issue is that this URL should not point to the WSDL, it should be the binding address which is found within the WSDL (wsdl:service -> wsdl:port -> wsdl:address) (this is a SAP web service, I understand that is why I must use the binding address).
I am thinking of using the XDocument class to get that value, but I am wondering if there is any "built-in" functionality in WCF or web services to get the binding address. Thank you.
I did a small function in VB.NET (sorry!) based on code at Parse Complex WSDL Parameter Information . Hope it helps.
Public Function GetURLFromWSDL(ByVal wsdl As String) As String
Dim request As HttpWebRequest = WebRequest.Create(wsdl)
request.ContentType = "text/xml;charset=""utf-8"""
request.Method = "GET"
request.Accept = "text/xml"
Using response As WebResponse = request.GetResponse()
Using stream As Stream = response.GetResponseStream()
Dim service As ServiceDescription = ServiceDescription.Read(stream)
Dim binding As SoapAddressBinding = service.Services(0).Ports(0).Extensions(0)
Return binding.Location
End Using
End Using
End Function
I have a bit of strange behaviour in an asp.net web application that involves the session state being lost.
Process
A user logs into the application and the session is set. They then fill out 1 field, and the application then does an AJAX POST to a .asmx web service. Within the web service, I am using a HttpWebRequest to grab data from another server.
This data is then output to the browser.
A few more fields are then filled in, and the data is then again Post to the same web service via an AJAX POST.
Problem
Straight after the HttpWebRequest, I grab the username from a session variable. This works.
On the next AJAX request however, the session no longer exists.
While testing this, I removed the stage at which the HttpWebRequest is called and my session is never lost. So for some reason, the session is removed AFTER my first AJAX POST and before the second AJAX POST only if I am running the HttpWebRequest code.
Code
I am not doing anything fancy in the code. Just doing a simple jQuery AJAX Post
$.ajax({
url: method,
data: params,
type: "POST",
contentType: "application/json; charset=utf-8", dataType: "json",
success: function (data) {
// handle data
},
error: function(xhr,status,error) { }
});
Creating a System.Net.HttpWebRequest and then getting the System.Net.HttpWebResponse out of that.
Then reading a session variable dim username as string = Session(_SESSION_USERNAME).ToString()
I have never noticed this behaviour before when using HttpWebRequest before (not using any AJAX though)
Function Backfill(value As String) As Details
Dim details As Details = Nothing
Dim appSettings As ConfigSettings.AppConfig = ConfigSettings.AppConfig.getConfig()
Dim url As String = appSettings.Settings.BackfillUrl
Dim username As String = appSettings.Settings.BackfillUser
Dim password As String = appSettings.Settings.BackfillPass
Dim expParameters As String = ""
Dim xml As XmlDocument = Nothing
Dim xmlHttp As XMLHTTP = Nothing
Dim nodeList As XmlNodeList = Nothing
Dim node As XmlNode = Nothing
Dim response As String = ""
Dim success As String = ""
'
' REMOVED TO HIDE INFO
expParameters = "<PARAMETERS>" & _
"</PARAMETERS>"
Try
xmlHttp = New XMLHTTP()
xmlHttp.open("POST", url)
xmlHttp.Send(expParameters)
response = xmlHttp.responseText()
xml = New XmlDocument
xml.LoadXml(response)
SaveExperianFile(xml, value)
nodeList = xml.DocumentElement.ChildNodes
node = nodeList.Item(0)
success = node.Attributes.GetNamedItem("success").Value.ToString.Trim
If success.ToLower.Trim = "y" Then
details = SetDetails(xml)
End If
Catch ex As Exception
Finally
If Not xmlHttp Is Nothing Then
xmlHttp.Dispose()
xmlHttp = Nothing
End If
End Try
Return details
End Function
edit
The XMLHTTP Class code can be seen here http://codepaste.net/ymnqsf
edit
Seems as though something strange is happening when I am saving the XMLDocument to my file system.
Private Sub SaveExperianFile(xml As XmlDocument, value As String)
Dim appConfig As ConfigSettings.AppConfig = ConfigSettings.AppConfig.getConfig()
Try
xml.Save(HttpContext.Current.Server.MapPath(appConfig.Settings.SavePath & value & "_backfill.xml"))
Catch ex As Exception
End Try
End Sub
If I don't call this method, then the session is always set.
Question
Do you know what is causing this behaviour?
Can you check if you just loose the session or the whole application is restarted. If you are saving the XML in the virtual directory / web application folder then it might case web application to restart. If many dozen files were added in short succession to each other, that would be a case to restart the App Pool.
just a hunch, but maybe you need to maintain cookies across HttpWebRequests.
have a look at this question for more help.
Http web request doesn't maintaining session
I have a web service, which accepts XML input. What I am trying to do is setup an aspx page which posts xml to the service. Here is my code so far, but I am getting an error 400 (bad request) when I try to submit...
Imports System.Net
Imports System.IO
Partial Class _Default
Inherits System.Web.UI.Page
Protected Sub Submit_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles Submit.Click
Dim strDataToPost As String
Dim myWebRequest As WebRequest
Dim myRequestStream As Stream
Dim myStreamWriter As StreamWriter
Dim myWebResponse As WebResponse
Dim myResponseStream As Stream
Dim myStreamReader As StreamReader
' Create a new WebRequest which targets the web service method
myWebRequest = WebRequest.Create("http://foo/p09SoapHttpPort")
' Data to send
strDataToPost = DataToSend.Text & Server.UrlEncode(Now())
' Set the method and content type
With myWebRequest
.Method = "POST"
.ContentType = "text/xml"
.Timeout = -1
.ContentLength = strDataToPost.Length()
End With
' write our data to the Stream using the StreamWriter.
myRequestStream = myWebRequest.GetRequestStream()
myStreamWriter = New StreamWriter(myRequestStream)
myStreamWriter.Write(strDataToPost)
myStreamWriter.Flush()
myStreamWriter.Close()
myRequestStream.Close()
' Get the response from the remote server.
myWebResponse = myWebRequest.GetResponse()
' Get the server's response status
myResponseStream = myWebResponse.GetResponseStream()
myStreamReader = New StreamReader(myResponseStream)
ResponseLabel.Text = myStreamReader.ReadToEnd()
myStreamReader.Close()
myResponseStream.Close()
' Close the WebResponse
myWebResponse.Close()
End Sub
End Class
If anyone knows of any good web resources on how to upload .xml files to a web service method that would also be a great help and would answer this question as I can re-work it that way.
Thanks.
P.S in the last edit, I modified the code to have .contentlength (thanks for the assistance). Unfortunately after this I am still getting 'Bad Request'. If anyone can confirm / disconfirm my code should be working, I will start investigating the service itself.
The data you're trying to post might look a little funny if you're concatenating a time string to it:
strDataToPost = DataToSend.Text & Server.UrlEncode(Now())
If DataToSend is proper XML, then you're adding the Url Encoding of Now() which makes me think it will no longer be valid XML.
Check to make sure your StreamWriter is not inserting additional characters (CR, LF). If it does, then the length you're sending does not correspond to the actual data, but that probably wouldn't have caused a problem before you started sending the content length.
Is your web service configuration to accept XML directly? I'm wondering if you might have to encapsulate the XML in multipart/form-data in order for your web service to accept it.
I'm not a web service expert, but I compared your code to some working code I have, and the only relevant difference is that you are not setting the ContentLength of your request.
myWebRequest.ContentLength = strDataToPost.Length()