def check_send_to_kindle_with_converter(formats):
    bookformats = list()
    if 'EPUB' in formats and 'MOBI' not in formats:
        bookformats.append({'format': 'Mobi',
                            'convert': 1,
                            'text': _('Convert %(orig)s to %(format)s and send to Kindle',
                                      orig='Epub',
                                      format='Mobi')})
    if 'AZW3' in formats and not 'MOBI' in formats:
        bookformats.append({'format': 'Mobi',
                            'convert': 2,
                            'text': _('Convert %(orig)s to %(format)s and send to Kindle',
                                      orig='Azw3',
                                      format='Mobi')})
    return bookformats
The web server receives a URL or similar request from an upstream component and retrieves the contents of this URL, but it does not sufficiently ensure that the request is being sent to the expected destination.