1.获取查询参数(URL 中的参数):

from flask import request

@app.route('/example')
def example():
    param_value = request.args.get('param_name')
    return f'Param value: {param_value}'

2.获取表单参数(通过 POST 请求提交的表单数据):

from flask import request

@app.route('/submit', methods=['POST'])
def submit():
    param_value = request.form.get('param_name')
    return f'Param value: {param_value}'

3.获取 JSON 数据(通过 POST 请求提交的 JSON 数据):

from flask import request, jsonify

@app.route('/json', methods=['POST'])
def json_example():
    data = request.get_json()
    param_value = data.get('param_name')
    return jsonify({'param_value': param_value})

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