text: from app import app
  from flask import request
  
  
  @app.route("/user-agent/a")
  def useragent_a():
      assert "Mozilla/5.0 A" == request.headers["User-Agent"]
      return ""
  
  
  @app.route("/user-agent/b")
  def useragent_b():
      assert "Mozilla/5.0 B" == request.headers["User-Agent"]
      return ""
  