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POSession state lost after HttpWebRequest within AJAX post
 

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  1. POSession state lost after HttpWebRequest within AJAX post
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    <p>I have a bit of strange behaviour in an <code>asp.net</code> web application that involves the session state being lost.</p> <p><strong>Process</strong></p> <p>A user logs into the application and the session is set. They then fill out 1 field, and the application then does an <code>AJAX POST</code> to a <code>.asmx</code> web service. Within the web service, I am using a <code>HttpWebRequest</code> to grab data from another server.</p> <p>This data is then output to the browser.</p> <p>A few more fields are then filled in, and the data is then again <code>Post</code> to the same web service via an <code>AJAX POST</code>.</p> <p><strong>Problem</strong></p> <p>Straight after the <code>HttpWebRequest</code>, I grab the username from a session variable. This works. On the next <code>AJAX</code> request however, the session no longer exists.</p> <p>While testing this, I removed the stage at which the <code>HttpWebRequest</code> is called and my session is never lost. So for some reason, the session is removed AFTER my first <code>AJAX POST</code> and before the second <code>AJAX POST</code> only if I am running the <code>HttpWebRequest</code> code.</p> <p><strong>Code</strong></p> <p>I am not doing anything fancy in the code. Just doing a simple jQuery AJAX Post</p> <p>$.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) { } });</p> <p>Creating a <code>System.Net.HttpWebRequest</code> and then getting the <code>System.Net.HttpWebResponse</code> out of that.</p> <p>Then reading a session variable <code>dim username as string = Session(_SESSION_USERNAME).ToString()</code></p> <p>I have never noticed this behaviour before when using <code>HttpWebRequest</code> before (not using any AJAX though)</p> <pre><code>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 = "&lt;PARAMETERS&gt;" &amp; _ "&lt;/PARAMETERS&gt;" 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 </code></pre> <p><strong>edit</strong></p> <p>The XMLHTTP Class code can be seen here <a href="http://codepaste.net/ymnqsf" rel="nofollow">http://codepaste.net/ymnqsf</a></p> <p><strong>edit</strong></p> <p>Seems as though something strange is happening when I am saving the <code>XMLDocument</code> to my file system.</p> <pre><code>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 &amp; value &amp; "_backfill.xml")) Catch ex As Exception End Try End Sub </code></pre> <p>If I don't call this method, then the session is always set.</p> <p><strong>Question</strong></p> <p>Do you know what is causing this behaviour?</p>
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    1. USTim B James
    1. USTim B James
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    1. COSomething is resetting the session. Could it be possible for you to post the webservice code?
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      1. USAmit Rai Sharma
    2. COupdated with code for the `HttpWebRequest` the webservice isnt doing anything fancy apart from calling the `HttpWebRequest` code, reading the session, and saving to a `SQL` database
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      1. USTim B James
    3. COCan you check to see if the session.sessionid is the same on the second request?
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      1. USlloydom
 

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