async.py 文件源码

def send(r, pool=None):
    """Sends the request object using the specified pool. If a pool isn't 
    specified this method blocks. Pools are useful because you can specify size
    and can hence limit concurrency."""

    if pool != None:
        return pool.spawn(r.send)

    return gevent.spawn(r.send)


# Patched requests.api functions.