title: How can I make sure scrapy-splash had render the entire page successfully
body: <p>Problem Occurred When I Was Crawled The Whole Website By Using splash To Render The Entire Target Page.Some Page Was Not Random Successfully So I Was False To Get The Information That Supports To Be There When Render Job Had Done.That Means I Just Get Part Of The Information From The Render Result Although I Can Get The Entire Information From Other Render Result.</p>
  
  <p>Here Is My Code:</p>
  
  <pre><code>yield SplashRequest(url,self.splash_parse,args = {"wait": 3,},endpoint="render.html")
  
  settings：
  SPLASH_URL = 'XXX'  
  DOWNLOADER_MIDDLEWARES = {
  'scrapy_splash.SplashCookiesMiddleware': 723,
  'scrapy_splash.SplashMiddleware': 725,
  'scrapy.downloadermiddlewares.httpcompression.HttpCompressionMiddleware': 810,
  }
  
  # Enable SplashDeduplicateArgsMiddleware:
  SPIDER_MIDDLEWARES = {
  'scrapy_splash.SplashDeduplicateArgsMiddleware': 100,
  }
  
  # Set a custom DUPEFILTER_CLASS:
  DUPEFILTER_CLASS = 'scrapy_splash.SplashAwareDupeFilter
  
  # a custom cache storage backend:
  HTTPCACHE_STORAGE = 'scrapy_splash.SplashAwareFSCacheStorage'
  </code></pre>