downloader.py 文件源码

def download(self, url, headers, proxy, num_retries, data=None):
        print 'Downloading:', url
        request = urllib2.Request(url, data, headers or {})
        opener = self.opener or urllib2.build_opener()
        if proxy:
            proxy_params = {urlparse.urlparse(url).scheme: proxy}
            opener.add_handler(urllib2.ProxyHandler(proxy_params))
        try:
            response = opener.open(request)
            html = response.read()
            code = response.code
        except Exception as e:
            print 'Download error:', str(e)
            html = ''
            if hasattr(e, 'code'):
                code = e.code
                if num_retries > 0 and 500 <= code < 600:
                    # retry 5XX HTTP errors
                    return self._get(url, headers, proxy, num_retries-1, data)
            else:
                code = None
        return {'html': html, 'code': code}