def waitForActionToFinish(connection, replyObj, actionUrl):
    '''
        This method waits for an action to finish executing. after a POST request is sent in order to start an action,
        The HTTP reply will contain, in the header, a 'location' field, that contains an URL.
        The action URL contains the status of the action. we perform a GET on that URL every 0.5 seconds until the action finishes with a success.
        If the action fails, we will throw an error and print the action's error message.

        Args:
        - connection is the connection object that manages the HTTP data transfers between the client and the REST API
        - replyObj the reply object holding the location
        - actionUrl - the url pointing to the operation
    '''

    actionStatusSuccess = {"v0": lambda x: x.state == kActionStateFinished and x.status == kActionStatusSuccessful,
                           "v1": lambda x: x.state == kActionStateSuccess}
    actionStatusError = {"v0": lambda x: x.status == kActionStatusError,
                         "v1": lambda x: x.state == kActionStateError}
    messageError = {"v0": lambda x: x.error,
                    "v1": lambda x: x.message}

    actionResultURL = replyObj.headers.get('location')
    apiVersion = getApiVersion(connection)
    if actionResultURL:
        actionResultURL = stripApiAndVersionFromURL(actionResultURL)
        actionFinished = False

        while not actionFinished:
            actionStatusObj = connection.httpGet(actionResultURL)
            if actionStatusSuccess[apiVersion](actionStatusObj):
                actionFinished = True
            elif actionStatusError[apiVersion](actionStatusObj):
                errorMsg = "Error while executing action '%s'." % actionResultURL
                errorMsg += messageError[apiVersion](actionStatusObj)
                raise Exception(errorMsg)
            else:
                time.sleep(0.1)