docs: def _prep_binary_content(self):
  
  		'''
  		Sets delivery method of either payload or header
  		Favors Content-Location header if set
  
  		Args:
  			None
  
  		Returns:
  			None: sets attributes in self.binary and headers
  		'''
  
  		# nothing present
  		if not self.data and not self.location and 'Content-Location' not in self.resource.headers.keys():
  			raise Exception('creating/updating NonRDFSource requires content from self.binary.data, self.binary.location, or the Content-Location header')
  
  		elif 'Content-Location' in self.resource.headers.keys():
  			logger.debug('Content-Location header found, using')
  			self.delivery = 'header'
  
  		# if Content-Location is not set, look for self.data_location then self.data
  		elif 'Content-Location' not in self.resource.headers.keys():
  
  			# data_location set, trumps Content self.data
  			if self.location:
  				# set appropriate header
  				self.resource.headers['Content-Location'] = self.location
  				self.delivery = 'header'
  
  			# data attribute is plain text, binary, or file-like object
  			elif self.data:
  
  				# if file-like object, set flag for api.http_request
  				if isinstance(self.data, io.BufferedIOBase):
  					logger.debug('detected file-like object')
  					self.delivery = 'payload'
  
  				# else, just bytes
  				else:
  					logger.debug('detected bytes')
  					self.delivery = 'payload'