def construct_request(model_type, client_name, client_pass, command, values):
    """
    Construct the request url.

    Inputs: - model_type: PServer usage mode type.
            - client_name: The PServer client name.
            - client_pass: The PServer client's password.
            - command: A PServer command.
            - values: PServer command arguments.

    Output: - base_request: The base request string.
    """
    base_request = (
        '{model_type}?clnt={client_name}|{client_pass}&com={command}&{values}'
        .format(model_type=model_type, client_name=client_name, client_pass
        =client_pass, command=command, values=values))
    return base_request
