def map(requests, stream=False, size=None, exception_handler=None, gtimeout=None):
    """Concurrently converts a list of Requests to Responses.

    :param requests: a collection of Request objects.
    :param stream: If True, the content will not be downloaded immediately.
    :param size: Specifies the number of requests to make at a time. If None, no throttling occurs.
    :param exception_handler: Callback function, called when exception occured. Params: Request, Exception
    :param gtimeout: Gevent joinall timeout in seconds. (Note: unrelated to requests timeout)
    """

    requests = list(requests)

    pool = Pool(size) if size else None
    jobs = [send(r, pool, stream=stream) for r in requests]
    gevent.joinall(jobs, timeout=gtimeout)

    ret = []

    for request in requests:
        if request.response is not None:
            ret.append(request.response)
        elif exception_handler and hasattr(request, 'exception'):
            ret.append(exception_handler(request, request.exception))
        else:
            ret.append(None)

    return ret
Concurrently converts a list of Requests to Responses.

    :param requests: a collection of Request objects.
    :param stream: If True, the content will not be downloaded immediately.
    :param size: Specifies the number of requests to make at a time. If None, no throttling occurs.
    :param exception_handler: Callback function, called when exception occured. Params: Request, Exception
    :param gtimeout: Gevent joinall timeout in seconds. (Note: unrelated to requests timeout)