old_contents: """
  Offsite Spider Middleware
  
  See documentation in docs/topics/spider-middleware.rst
  """
  
  import re
  
  from scrapy import signals
  from scrapy.http import Request
  from scrapy.utils.httpobj import urlparse_cached
  from scrapy import log
  
  class OffsiteMiddleware(object):
  
      @classmethod
      def from_crawler(cls, crawler):
          o = cls()
          crawler.signals.connect(o.spider_opened, signal=signals.spider_opened)
          return o
  
      def process_spider_output(self, response, result, spider):
          for x in result:
              if isinstance(x, Request):
                  if x.dont_filter or self.should_follow(x, spider):
                      yield x
                  else:
                      domain = urlparse_cached(x).hostname
                      if domain and domain not in self.domains_seen:
                          self.domains_seen.add(domain)
                          log.msg(format="Filtered offsite request to %(domain)r: %(request)s",
                                  level=log.DEBUG, spider=spider, domain=domain, request=x)
              else:
                  yield x
  
      def should_follow(self, request, spider):
          regex = self.host_regex
          # hostanme can be None for wrong urls (like javascript links)
          host = urlparse_cached(request).hostname or ''
          return bool(regex.search(host))
  
      def get_host_regex(self, spider):
          """Override this method to implement a different offsite policy"""
          allowed_domains = getattr(spider, 'allowed_domains', None)
          if not allowed_domains:
              return re.compile('') # allow all by default
          domains = [d.replace('.', r'\.') for d in allowed_domains]
          regex = r'^(.*\.)?(%s)$' % '|'.join(domains)
          return re.compile(regex)
  
      def spider_opened(self, spider):
          self.host_regex = self.get_host_regex(spider)
          self.domains_seen = set()
  
new_contents: """
  Offsite Spider Middleware
  
  See documentation in docs/topics/spider-middleware.rst
  """
  
  import re
  
  from scrapy import signals
  from scrapy.http import Request
  from scrapy.utils.httpobj import urlparse_cached
  from scrapy import log
  
  class OffsiteMiddleware(object):
  
      @classmethod
      def from_crawler(cls, crawler):
          o = cls()
          crawler.signals.connect(o.spider_opened, signal=signals.spider_opened)
          return o
  
      def process_spider_output(self, response, result, spider):
          for x in result:
              if isinstance(x, Request):
                  if x.dont_filter or self.should_follow(x, spider):
                      yield x
                  else:
                      domain = urlparse_cached(x).hostname
                      if domain and domain not in self.domains_seen:
                          self.domains_seen.add(domain)
                          log.msg(format="Filtered offsite request to %(domain)r: %(request)s",
                                  level=log.DEBUG, spider=spider, domain=domain, request=x)
              else:
                  yield x
  
      def should_follow(self, request, spider):
          regex = self.host_regex
          # hostname can be None for wrong urls (like javascript links)
          host = urlparse_cached(request).hostname or ''
          return bool(regex.search(host))
  
      def get_host_regex(self, spider):
          """Override this method to implement a different offsite policy"""
          allowed_domains = getattr(spider, 'allowed_domains', None)
          if not allowed_domains:
              return re.compile('') # allow all by default
          domains = [d.replace('.', r'\.') for d in allowed_domains]
          regex = r'^(.*\.)?(%s)$' % '|'.join(domains)
          return re.compile(regex)
  
      def spider_opened(self, spider):
          self.host_regex = self.get_host_regex(spider)
          self.domains_seen = set()
  
subject: Fix comment typo