Question

我正在使用while循环，我试图运行5分钟并检查它是否得到http响应代码200.问题是如果它没有得到200它将继续运行，但它当网站启动并运行时，不会转到其他地方。

r = requests.head("http://www.testing.co.uk")
while r.status_code != 200:
    print "Response not == to 200."
    time.sleep(30)
else:
    print "Response is 200 - OK"

Answer 1

重复请求。

r = requests.head("http://www.testing.co.uk")

while r.status_code != 200:
    print "Response not == to 200."
    time.sleep(30)
    r = requests.head("http://www.testing.co.uk")

else:
    print "Response is 200 - OK"

Answer 2

请求应该循环：

numOfRequests = 1000
for i in range(numOfRequests):
    r = requests.head("http://www.testing.co.uk")
    if r.status_code == 200:
        print "Response is 200 - OK"
        break
    print "Response not == to 200."
    time.sleep(30)

Answer 3

尝试此操作，其中包括最多约5分钟的超时检查：

import time
from datetime import datetime, timedelta
import requests

FIVE_MINUTES = timedelta(minutes=1) * 5
RETRY_DELAY = 30

end_time = datetime.now() + FIVE_MINUTES

while datetime.now() < end_time:
    r = requests.head("http://www.testing.co.uk")
    if r.status_code == 200:
        print "Response is 200 - OK"
        break
    else:
        print "Response not == to 200."
        time.sleep(RETRY_DELAY)
else:
    print 'Timed out'

N.B大约是因为每个请求将花费不可预测的时间段，例如请求可能会挂起2分钟，而其他请求可能会立即失败。此外，您应该添加异常处理，因为requests引发了诸如“连接被拒绝”等故障的异常。

与其他循环

3 个答案: