req_list = []
for i in range(times):
req_list.append(grequests.post(url, data=json.dumps(data1), headers=header))
req_list.append(grequests.post(url, data=json.dumps(data2), headers=header))
req_list.append(grequests.post(url, data=json.dumps(data3), headers=header))
res_list = grequests.map(req_list)
能否知道请求的精确发出时间 (毫秒)?