old_contents: import io
  import email
  
  from werkzeug.datastructures import FileStorage
  
  from .parse_data_url import parse_data_url
  
  # DataResponse exposes the mediatype and emulates some methods/properties of
  # HTTPResponse: msg, headers, length, info, geturl, getheader and getheaders
  class DataResponse(io.BytesIO):
      __slots__ = 'url','mediatype','msg','headers','length'
      def __init__(self,url):
          data, mediatype = parse_data_url(url)
          io.BytesIO.__init__(self,data)
          self.url = url
          self.mediatype = mediatype
          self.length = len(data)
          self.headers = self.msg = email.message.Message()
          if mediatype is not None:
              self.msg.add_header("Content-Type",mediatype)
  
      def getheader(self,name,default=None):
          headers = self.headers.get_all(name) or default
          if isinstance(headers, str) or not hasattr(headers, '__iter__'):
              return headers
          return ', '.join(headers)
      
      def getheaders(self):
          return list(self.headers.items())
  
      def geturl(self):
          return self.url
  
      def info(self):
          return self.headers
  
new_contents: import io
  import email
  
  from .parse_data_url import parse_data_url
  
  # DataResponse exposes the mediatype and emulates some methods/properties of
  # HTTPResponse: msg, headers, length, info, geturl, getheader and getheaders
  class DataResponse(io.BytesIO):
      __slots__ = 'url','mediatype','msg','headers','length'
      def __init__(self,url):
          data, mediatype = parse_data_url(url)
          io.BytesIO.__init__(self,data)
          self.url = url
          self.mediatype = mediatype
          self.length = len(data)
          self.headers = self.msg = email.message.Message()
          if mediatype is not None:
              self.msg.add_header("Content-Type",mediatype)
  
      def getheader(self,name,default=None):
          headers = self.headers.get_all(name) or default
          if isinstance(headers, str) or not hasattr(headers, '__iter__'):
              return headers
          return ', '.join(headers)
      
      def getheaders(self):
          return list(self.headers.items())
  
      def geturl(self):
          return self.url
  
      def info(self):
          return self.headers
  
subject: remove unused import