requests. The difference between session () sending requests and using requests to send requests directly

requests.session() Send a request And use requests The difference between sending a request directly

requests.session() Send a request And use requests The difference between sending a request directly
One 、Session

stay requests in ,session Object is a very common object , This object represents a user session ： Start by connecting to the server from the client browser , Disconnect from server to client browser .

Sessions allow us to keep certain parameters across requests , Like in the same session Keep... Between all requests made by the instance cookie Information .
1、 establish session object

session = requests.session()

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obtain session After object , You can call the method in the object to send the request .

response1 = session.get(url,params,headers)
response2 = session.post(url,data,json,headers)

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adopt session To send the get、post、delete、put Wait for requests and get responses .
Two 、requests

requests yes Python A third-party library for , Mainly used to send network requests , such as get、post And other requests have achieved the purpose of obtaining network response

The grammar is as follows ：

import requests
response1 = requests.get(url,params,headers,cookies) # send out get Network request
response2 = requests.post(url,data,json,headers,cookies) # send out post Network request

put、delete Similar to other request methods

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3、 ... and 、session Objects and requests The difference between the requests sent by the two methods ：
1、 scene

 Log in to a mall 
 Query my order data 

2、 Business code analysis

 First of all, there are two interfaces involved , One “ Login interface ”, The other is “ Query order ” The interface of .
 The normal operation is that we   By calling the login interface   To get the response  cookie Information .
 And then take this  cookie Information as a parameter for the next request （cookie With the information of the current login ） To request   Interface for querying orders 

The general code is as follows ：

The following code is purely for example , Useless pseudo code

import requests

Login interface

response1 = requests.get(url_login,params,headers)

obtain cookies Information

cookies = response.cookies

Got cookies It's a dictionary type

cookie = cookies.get(“cookies Of key”)

request Query interface

response2 = requests.get(search_url,params,headers,cookies=cookie)

View the results of the query response

response2.json()

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Use session The code is as follows ：

The following code is purely for example , Useless pseudo code

import requests

obtain session object

session = requests.session()

Login interface

response1 = session.get(url_login,params,headers)

request Query interface

response2 = session.get(search_url,params,headers)

View the results of the query response

response2.json()

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difference ：

 Through the comparison of codes, it can be found that session Object efficiency will be better , Not every time cookie The information is placed in the request content 
session Object can automatically get cookie And we can automatically bring what we get in the next request cookie Information , There is no need to fill in 

Supplementary information ：
From the return value of the request method response What you can get from ：

response.status_code Status code
response.url request url
response.encoding Check the response header character encoding
response.cookies cookie Information
response.headers Header information
response.text Response content in text form
response.content Response contents in binary bytes
response.json() JSON Response content of form ( In fact, that is dict Dictionary type )
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