Scrapy - FormRequest在方法为POST时发送GET请求

import scrapy

class MySpider(scrapy.Spider):
    name = 'my_spider'
    start_urls = ['http://example.com/login']

    def parse(self, response):
        # 提取登录页面的表单数据
        formdata = {
            'username': 'your_username',
            'password': 'your_password'
        }

        # 发送POST请求进行登录
        yield scrapy.FormRequest(url='http://example.com/login', formdata=formdata, callback=self.after_login)

    def after_login(self, response):
        # 登录成功后，发送GET请求获取其他数据
        yield scrapy.FormRequest(url='http://example.com/data', method='GET', callback=self.parse_data)

    def parse_data(self, response):
        # 解析获取到的数据
        # ...