请求 - 事件挂钩

---

我们可以使用事件挂钩将事件添加到请求的 URL。在下面的示例中，我们将添加一个回调函数，该函数将在响应可用时被调用。

例子

要添加回调，我们需要使用 hooks 参数，如下例所示 -

import requests
def printData(r, *args, **kwargs):
   print(r.url)
   print(r.text)
getdata = requests.get('https://jsonplaceholder.typicode.com/users', 
hooks={'response': printData})  

输出

E:\prequests>python makeRequest.py
https://jsonplaceholder.typicode.com/users
[
   {
      "id": 1,
      "name": "Leanne Graham",
      "username": "Bret",
      "email": "Sincere@april.biz",
      "address": {
         "street": "Kulas Light",
         "suite": "Apt. 556",
         "city": "Gwenborough",
         "zipcode": "92998-3874",
         "geo": {
            "lat": "-37.3159",
            "lng": "81.1496"
         }
      }, 
      "phone": "1-770-736-8031 x56442",
      "website": "hildegard.org",
      "company": {
         "name": "Romaguera-Crona",
         "catchPhrase": "Multi-layered client-server neural-net",
         "bs": "harness real-time e-markets"
      }
   }
]

您还可以调用多个回调函数，如下所示 -

例子

import requests
def printRequestedUrl(r, *args, **kwargs):
   print(r.url)
def printData(r, *args, **kwargs):
   print(r.text)
getdata = requests.get('https://jsonplaceholder.typicode.com/users', 
hooks = {'response': [printRequestedUrl, printData]})

输出

E:\prequests>python makeRequest.py
https://jsonplaceholder.typicode.com/users
[
   {
      "id": 1,
      "name": "Leanne Graham",
      "username": "Bret",
      "email": "Sincere@april.biz",
      "address": {
         "street": "Kulas Light",
         "suite": "Apt. 556",
         "city": "Gwenborough",
         "zipcode": "92998-3874",
         "geo": {
            "lat": "-37.3159",
            "lng": "81.1496"
         }
      },
      "phone": "1-770-736-8031 x56442",
      "website": "hildegard.org",
      "company": {
         "name": "Romaguera-Crona",
         "catchPhrase": "Multi-layered client-server neural-net",
         "bs": "harness real-time e-markets"
      }
   }
]

您还可以将挂钩添加到创建的会话中，如下所示 -

例子

import requests
def printData(r, *args, **kwargs):
print(r.text)
s = requests.Session()
s.hooks['response'].append(printData)
s.get('https://jsonplaceholder.typicode.com/users')

输出

E:\prequests>python makeRequest.py
[
   {
      "id": 1,
      "name": "Leanne Graham",
      "username": "Bret",
      "email": "Sincere@april.biz",
      "address": {
         "street": "Kulas Light",
         "suite": "Apt. 556",
         "city": "Gwenborough",
         "zipcode": "92998-3874",
         "geo": {
            "lat": "-37.3159",
            "lng": "81.1496"
         }
      },
      "phone": "1-770-736-8031 x56442",
      "website": "hildegard.org",
      "company": {
         "name": "Romaguera-Crona",
         "catchPhrase": "Multi-layered client-server neural-net",
         "bs": "harness real-time e-markets"
      }
   }
]