3-12通过selenium从request中查看sessionId

代码：

#coding=utf-8

from selenium import webdriver

import json

import requests

##############3-12：request实现打开地址封装_start################

url = 'http://127.0.0.1:4444/wd/hub/session'

data = json.dumps({

    'desiredCapabilities':{

        'browserName':'MicrosoftEdge'

    }

})

res = requests.post(url,data).json()

session =  res['sessionId']

print(session)

##############3-12：request实现打开地址封装_end################

结果：

1.VSCode日志：

PS E:\30.Study\30.自动化测试\99.零基础入门 Python Web 自动化测试\10.seleniumCodePractice> & "C:/Program Files/Python38/python.exe" "e:/30.Study/30.自动化测试/99.零基础
入门 Python Web 自动化测试/10.seleniumCodePractice/202006/open_browser_3-12.py"
2928e4f0ddadff0975d90cddfba68260
PS E:\30.Study\30.自动化测试\99.零基础入门 Python Web 自动化测试\10.seleniumCodePractice>

2.cmd日志：
07:02:08.903 INFO [ActiveSessionFactory.apply] - Capabilities are: {
  "browserName": "MicrosoftEdge"
}
07:02:08.904 INFO [ActiveSessionFactory.lambda$apply$11] - Matched factory org.openqa.selenium.grid.session.remote.ServicedSession$Factory (provider: org.openqa.selenium.edge.EdgeDriverService)
Starting MSEdgeDriver 83.0.478.50 (4e8532eb6939de0932c9d36c59227be3a4e49bef) on port 22392
Only local connections are allowed.
Please see https://chromedriver.chromium.org/security-considerations for suggestions on keeping MSEdgeDriver safe.
MSEdgeDriver was started successfully.
07:02:12.075 INFO [ProtocolHandshake.createSession] - Detected dialect: W3C
07:02:12.094 INFO [RemoteSession$Factory.lambda$performHandshake$0] - Started new session 2928e4f0ddadff0975d90cddfba68260 (org.openqa.selenium.edge.EdgeDriverService)

思考：

session =  res['sessionId']中的"sessionId"是如何确定下来的？