你如何在Flask上获得查询字符串？

from flask import Flask, request

app = Flask(__name__)

@app.route('/')
def index():
    query_string = request.args
    # 获取特定查询参数
    param1 = request.args.get('param1')
    param2 = request.args.get('param2')
    # 或者使用getlist获取重复的参数
    param3 = request.args.getlist('param3')

    # 处理查询参数
    # ...

    return 'Hello, World!'