def _request_headers(self):
headers = {<EOL>'<STR_LIT>': self._contentful_user_agent(),<EOL>'<STR_LIT:Content-Type>': '<STR_LIT>'.format(  <EOL>self.api_version<EOL>)<EOL>}<EOL>if self.authorization_as_header:<EOL><INDENT>headers['<STR_LIT>'] = '<STR_LIT>'.format(self.access_token)<EOL><DEDENT>headers['<STR_LIT>'] = '<STR_LIT>' if self.gzip_encoded else '<STR_LIT>'<EOL>return headers<EOL>
Sets the default Request Headers.