如何在scrapy-splash中同时返回png和html？

SPLASH_URL = 'http://localhost:8050'
DOWNLOADER_MIDDLEWARES = {
    'scrapy_splash.SplashCookiesMiddleware': 723,
    'scrapy_splash.SplashMiddleware': 725,
    'scrapy.downloadermiddlewares.httpcompression.HttpCompressionMiddleware': 810,
}
SPIDER_MIDDLEWARES = {
    'scrapy_splash.SplashDeduplicateArgsMiddleware': 100,
}

import scrapy
from scrapy_splash import SplashRequest

class MySpider(scrapy.Spider):
    name = 'my_spider'

    def start_requests(self):
        url = 'http://example.com'
        yield SplashRequest(url, self.parse, endpoint='render.png', args={'html': 1})

    def parse(self, response):
        # 处理返回的png和html数据
        png_data = response.body
        html_data = response.text
        # 其他处理逻辑