Python爬虫,用scrapy框架和scrapy-splash爬豆瓣读书设置代理不起作用，有没有大神帮忙看一下，谢谢

用scrapy框架和scrapy-splash爬豆瓣读书设置代理不起作用，代理设置后还是提示需要登录。
settings内的FirstSplash.middlewares.FirstsplashSpiderMiddleware':823和FirstsplashSpiderMiddleware里面的 request.meta['splash']['args']['proxy'] = "'http://112.87.69.226:9999"是从网上搜的，代理ip是从【西刺免费代理IP】这个网站随便找的一个，scrapy crawl Doubanbook打印出来的text
内容是需要登录。有没有大神帮忙看看，感谢！运行结果：

spider代码：

 name = 'doubanBook'
    category = ''
    def start_requests(self):
        serachBook = ['python','scala','spark']

        for x in serachBook:
            self.category = x
            start_urls = ['https://book.douban.com/subject_search', ]
            url=start_urls[0]+"?search_text="+x
            self.log("开始爬取："+url)
            yield SplashRequest(url,self.parse_pre)

    def parse_pre(self, response):
        print(response.text)

中间件代理配置：

class FirstsplashSpiderMiddleware(object):
    def process_request(self, request, spider):
        print("进入代理")
        print(request.meta['splash']['args']['proxy'])
        request.meta['splash']['args']['proxy'] = "'http://112.87.69.226:9999"
        print(request.meta['splash']['args']['proxy'])

settings配置：

BOT_NAME = 'FirstSplash'
SPIDER_MODULES = ['FirstSplash.spiders']
NEWSPIDER_MODULE = 'FirstSplash.spiders'
ROBOTSTXT_OBEY = False
#docker+scrapy-splash配置
FEED_EXPORT_ENCODING='utf-8'
#doucer服务地址
SPLASH_URL = 'http://127.0.0.1:8050'
# 去重过滤器
DUPEFILTER_CLASS = 'scrapy_splash.SplashAwareDupeFilter'
# 使用Splash的Http缓存
HTTPCACHE_STORAGE = 'scrapy_splash.SplashAwareFSCacheStorage'
#此处配置改为splash自带配置
SPIDER_MIDDLEWARES = {
    'scrapy_splash.SplashDeduplicateArgsMiddleware': 100,
}

#下载器中间件改为splash自带配置
DOWNLOADER_MIDDLEWARES = {
    'scrapy_splash.SplashCookiesMiddleware': 723,
    'scrapy_splash.SplashMiddleware': 725,
    'scrapy.downloadermiddlewares.httpcompression.HttpCompressionMiddleware': 810,
     'FirstSplash.middlewares.FirstsplashSpiderMiddleware':823,
}
# 模拟浏览器请求头
DEFAULT_REQUEST_HEADERS = {
    'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/62.0.3202.89 Safari/537.36',
    'Accept': 'text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8',
}

你的爬虫代理可能不是高匿的，还有就是免费的有时候操作的多了，已经被人拉黑了。你可以访问http://www.httpbin.org/ip检查代理是否生效