[jduteau]

I've never seen this error before, but when I try to link "Damnation Alley" by Roger Zelazny with ISBN 9780743413176, I get an
ERROR:Unhandled exception with ResponseNotReady:Request-started
as the message. Here is the details:

calibre, version 5.3.0
ERROR: Unhandled exception: <b>ResponseNotReady</b>:Request-started

calibre 5.3 embedded-python: True is64bit: True
macOS-10.15.7-x86_64-i386-64bit Darwin ('64bit', '')
('Darwin', '19.6.0', 'Darwin Kernel Version 19.6.0: Mon Aug 31 22:12:52 PDT 2020; root:xnu-6153.141.2~1/RELEASE_X86_64')
Python 3.8.5
OSX: ('10.15.7', ('', '', ''), 'x86_64')
Interface language: None
Successfully initialized third party plugins: Goodreads Sync (1, 14, 3) && Kobo Utilities (2, 11, 8) && KoboTouchExtended (3, 4, 1) && Overdrive Link (2, 42, 0) && Overdrive Link* (2, 42, 0)
Traceback (most recent call last):
File "calibre_plugins.goodreads_sync.action", line 458, in search_goodreads_to_link_book
self.search_to_link_books(calibre_books)
File "calibre_plugins.goodreads_sync.action", line 480, in search_to_link_books
goodreads_id_for_isbn = self.grhttp.get_goodreads_id_for_isbn(isbn)
File "calibre_plugins.goodreads_sync.core", line 421, in get_goodreads_id_for_isbn
(response, content) = self._request_get(url, suppress_status='404')
File "calibre_plugins.goodreads_sync.core", line 178, in _request_get
response, content = h.request(url, method='GET')
File "calibre_plugins.goodreads_sync.httplib2.__init__" , line 1689, in request
(response, content) = self._request(conn, authority, uri, request_uri, method, body, headers, redirections, cachekey)
File "calibre_plugins.goodreads_sync.httplib2.__init__" , line 1429, in _request
(response, content) = self._conn_request(conn, request_uri, method, body, headers)
File "calibre_plugins.goodreads_sync.httplib2.__init__" , line 1385, in _conn_request
response = conn.getresponse()
File "http/client.py", line 1337, in getresponse
http.client.ResponseNotReady: Request-started