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(PowerShell) 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 .NET Downloads

Chilkat .NET Assemblies

Add-Type -Path "C:\chilkat\ChilkatDotNet47-9.5.0-x64\ChilkatDotNet47.dll"

# All Chilkat classes can be unlocked at once at the beginning of a program
# by calling UnlockBundle.  It requires a Bundle unlock code.
$chilkatGlob = New-Object Chilkat.Global
$success = $chilkatGlob.UnlockBundle("Anything for 30-day trial.")
if ($success -ne $true) {
    $($chilkatGlob.LastErrorText)
    exit
}

$http = New-Object Chilkat.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 = $http.QuickGetObjAsync("https://stackexchange.com")
if ($http.LastMethodSuccess -ne $true) {
    $($http.LastErrorText)
    exit
}

# Schedule the task for running on the thread pool.  This changes the task's state
# from Inert to Live.
$success = $task.Run()
if ($success -ne $true) {
    $($task.LastErrorText)

    exit
}

# 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.
while ($task.Finished -ne $true) {

    # Sleep 100 ms.
    $task.SleepMs(100)

}

# 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 -ne 7) {
    $("Task did not complete.")
    $("task status: " + $task.Status)

    exit
}

# 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.
$resp = New-Object Chilkat.HttpResponse

$success = $resp.LoadTaskResult($task)
if ($success -ne $true) {
    $($resp.LastErrorText)

    exit
}

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

$("status code: " + $resp.StatusCode)
$("response header: " + $resp.Header)

# ..

 

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