import urllib.request
from szurubooru import errors


def download(url):
    assert url
    request = urllib.request.Request(url)
    request.add_header('Referer', url)
    try:
        with urllib.request.urlopen(request) as handle:
            return handle.read()
    except Exception as ex:
        raise errors.ProcessingError('Error downloading %s (%s)' % (url, ex))