index.py 文件源码

def _get_content_type(url, session=None):
        """Get the Content-Type of the given url, using a HEAD request"""
        if session is None:
            session = PipSession()

        scheme, netloc, path, query, fragment = urlparse.urlsplit(url)
        if not scheme in ('http', 'https', 'ftp', 'ftps'):
            ## FIXME: some warning or something?
            ## assertion error?
            return ''

        resp = session.head(url, allow_redirects=True)
        resp.raise_for_status()

        return resp.headers.get("Content-Type", "")