(Go) 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.

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    // All Chilkat classes can be unlocked at once at the beginning of a program
    // by calling UnlockBundle.  It requires a Bundle unlock code.
    chilkatGlob := chilkat.NewGlobal()
    success := chilkatGlob.UnlockBundle("Anything for 30-day trial.")
    if success != true {
        fmt.Println(chilkatGlob.LastErrorText())
        chilkatGlob.DisposeGlobal()
        return
    }

    http := chilkat.NewHttp()

    // 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.
    c := make(chan *chilkat.Task)
    go http.QuickGetObjAsync("https://stackexchange.com",c)
    task := <-c
    if http.LastMethodSuccess() != true {
        fmt.Println(http.LastErrorText())
        chilkatGlob.DisposeGlobal()
        http.DisposeHttp()
        task.DisposeTask()
        return
    }

    // Schedule the task for running on the thread pool.  This changes the task's state
    // from Inert to Live.

    if success != true {
        fmt.Println(task.LastErrorText())
        task.DisposeTask()
        chilkatGlob.DisposeGlobal()
        http.DisposeHttp()
        task.DisposeTask()
        return
    }

    // 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.
    for task.Finished() != 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() != 7 {
        fmt.Println("Task did not complete.")
        fmt.Println("task status: ", task.Status())
        task.DisposeTask()
        chilkatGlob.DisposeGlobal()
        http.DisposeHttp()
        task.DisposeTask()
        return
    }

    // 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 := chilkat.NewHttpResponse()

    success = resp.LoadTaskResult(task)
    if success != true {
        fmt.Println(resp.LastErrorText())
        task.DisposeTask()
        chilkatGlob.DisposeGlobal()
        http.DisposeHttp()
        task.DisposeTask()
        resp.DisposeHttpResponse()
        return
    }

    task.DisposeTask()

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

    fmt.Println("status code: ", resp.StatusCode())
    fmt.Println("response header: ", resp.Header())

    // ..

    chilkatGlob.DisposeGlobal()
    http.DisposeHttp()
    task.DisposeTask()
    resp.DisposeHttpResponse()