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Classic ASP Examples

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(Classic ASP) Getting the HTTP Response after an Asynchronous HTTP Request Completes

Some HTTP methods return an HTTP response object. This example demonstrates how to obtain the HTTP response object for such a method when calling asynchronously.

Chilkat ActiveX Downloads

ActiveX for 32-bit and 64-bit Windows

<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
</head>
<body>
<%
'  All Chilkat classes can be unlocked at once at the beginning of a program
'  by calling UnlockBundle.  It requires a Bundle unlock code.
set chilkatGlob = Server.CreateObject("Chilkat_9_5_0.Global")
success = chilkatGlob.UnlockBundle("Anything for 30-day trial.")
If (success <> 1) Then
    Response.Write "<pre>" & Server.HTMLEncode( chilkatGlob.LastErrorText) & "</pre>"
    Response.End
End If

set http = Server.CreateObject("Chilkat_9_5_0.Http")

'  Call the async version of the QuickGetObj method to return a task object.
'  The task object is loaded, but is in the Inert state -- meaning it is
'  not yet scheduled to run on Chilkat's background thread pool.
' task is a Chilkat_9_5_0.Task
Set task = http.QuickGetObjAsync("https://stackexchange.com")
If (http.LastMethodSuccess <> 1) Then
    Response.Write "<pre>" & Server.HTMLEncode( http.LastErrorText) & "</pre>"
    Response.End
End If

'  Schedule the task for running on the thread pool.  This changes the task's state
'  from Inert to Live.
success = task.Run()
If (success <> 1) Then
    Response.Write "<pre>" & Server.HTMLEncode( task.LastErrorText) & "</pre>"

    Response.End
End If

'  The application is now free to do anything else
'  while the HTML page is being downloaded.

'  For this example, we'll simply sleep and periodically
'  check to see if the QuickGetObjAsync if finished.
Do While task.Finished <> 1

    '  Sleep 100 ms.
    task.SleepMs 100

Loop

'  A finished task could be one that was canceled, aborted, or truly finished.

'  If the task was "canceled", it was canceled prior to actually starting.  This could
'  happen if the task was canceled while waiting in a thread pool queue to be scheduled by Chilkat's
'  background thread pool scheduler.

'  If the task was "aborted", it indicates that it was canceled while running in a background thread.
'  The ResultErrorText will likely indicate that the task was aborted.

'  If the task "completed", then it ran to completion, but the actual success/failure of the method
'  is determined by the result obtained via a GetResult* method.  (A "completed" task will
'  have a StatusInt equal to 7.   If the task finished, but was not completed, then it must've
'  been aborted or canceled:
If (task.StatusInt <> 7) Then
    Response.Write "<pre>" & Server.HTMLEncode( "Task did not complete.") & "</pre>"
    Response.Write "<pre>" & Server.HTMLEncode( "task status: " & task.Status) & "</pre>"

    Response.End
End If

'  The synchronous call to QuickGetObj would return an HTTP response object.  To get this
'  response object for the async call, we instantiate a new/empty HTTP response object,
'  and then load it from the completed task.
set resp = Server.CreateObject("Chilkat_9_5_0.HttpResponse")

success = resp.LoadTaskResult(task)
If (success <> 1) Then
    Response.Write "<pre>" & Server.HTMLEncode( resp.LastErrorText) & "</pre>"

    Response.End
End If

'  Now that we have the response, we can get all of the information:

Response.Write "<pre>" & Server.HTMLEncode( "status code: " & resp.StatusCode) & "</pre>"
Response.Write "<pre>" & Server.HTMLEncode( "response header: " & resp.Header) & "</pre>"

'  ...

%>
</body>
</html>

 

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