text: # from flask import Flask, render_template, request, redirect, url_for, session, flash, jsonify,Response
  # http://127.0.0.1:5000/test/a?x=1
  # request.path: /test/a
  # request.host: 127.0.0.1:5000
  # request.host_url: http://127.0.0.1:5000/
  # request.full_path: /test/a?x=1
  # request.script_root:
  # request.url: http://127.0.0.1:5000/test/a?x=1
  # request.base_url: http://127.0.0.1:5000/test/a
  # request.url_root: http://127.0.0.1:5000/
  
  
  # 来自：https://www.cnblogs.com/lyg-blog/p/10049086.html