+ def _extract_http_audio(self, webpage, video_id):
+ fields = self._hidden_inputs(webpage)
+ http_audio_url = fields['filename']
+ if http_audio_url is None:
+ return []
+
+ cookies_header = {'Cookie': self._extract_cookies(webpage)}
+
+ # base URL is found in the Location header in the response returned by
+ # GET https://www.infoq.com/mp3download.action?filename=... when logged in.
+ http_audio_url = compat_urlparse.urljoin('http://res.infoq.com/downloads/mp3downloads/', http_audio_url)
+
+ # audio file seem to be missing some times even if there is a download link
+ # so probe URL to make sure
+ if not self._is_valid_url(http_audio_url, video_id, headers=cookies_header):
+ return []
+
+ return [{
+ 'format_id': 'http_audio',
+ 'url': http_audio_url,
+ 'vcodec': 'none',
+ 'http_headers': cookies_header,
+ }]
+