如何在没有get请求时仅处理csrf post请求

from flask import Flask, request, session

app = Flask(__name__)
app.secret_key = 'your_secret_key'  # 设置会话密钥

def generate_csrf_token():
    if 'csrf_token' not in session:
        session['csrf_token'] = 'your_generated_csrf_token'  # 生成CSRF令牌
    return session['csrf_token']

@app.route('/your_post_endpoint', methods=['POST'])
def handle_post_request():
    if request.method == 'POST':
        csrf_token = session.pop('csrf_token', None)  # 从会话中获取并移除CSRF令牌
        if not csrf_token or csrf_token != request.form.get('csrf_token'):  # 验证CSRF令牌
            return 'Invalid CSRF token'
        # 处理POST请求
        return 'Success'

@app.route('/your_form_endpoint', methods=['GET'])
def render_form():
    csrf_token = generate_csrf_token()  # 生成CSRF令牌
    return '''
        <form method="POST" action="/your_post_endpoint">
            <input type="hidden" name="csrf_token" value="{}">  <!-- 添加CSRF令牌字段 -->
            <!-- 其他表单字段 -->
            <input type="submit" value="Submit">
        </form>
    '''.format(csrf_token)

if __name__ == '__main__':
    app.run()