I believe they have still another way for the covers. I have the same error several times in the BOL_NL Cover section. I have collected some of them so you have testing titles.
Log:
Running identify query with parameters:
{u'authors': [u'Jos Pierreux'], u'identifiers': {u'isbn': u'9789464340037'}, u'title': u'Russische poppetjes', u'timeout': 30}
Using plugins: BOL_NL (4, 5, 3)
The log from individual plugins is below
****************************** BOL_NL (4, 5, 3) ******************************
Found 1 results
Downloading from BOL_NL took 1.08800005913
---
Title : Russische poppetjes
Author(s) : Jos Pierreux
Publisher : Uitgeverij Vrijdag
Tags : Thrillers & Spanning
Languages : nld
Rating :
Published : 2021-06-02T00:00:00+00:00
Identifiers : isbn:9789464340037
************************************************** ******************************
The identify phase took 1.25 seconds
The longest time (1.088000) was taken by: BOL_NL
Merging results from different sources
We have 1 merged results, merging took: 0.00 seconds
....
....
....
Starting cover download for: Russische poppetjes
Query: Russische poppetjes [u'Jos Pierreux'] {u'isbn': u'9789464340037'}
****************************** BOL_NL Covers ******************************
Request extra headers: [(u'User-agent', u'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/72.0.3626.121 Safari/537.36')]
Failed to download valid cover
Took 1.18300008774 seconds
No cached cover found, running identify
Querying:
https://www.bol.com/nl/s/?searchtext...text=books_all
BOL_NL url: u'https://www.bol.com/nl/p/russische-poppetjes/9300000041535055/'
_parse_language: lang= Nederlands
_parse_language: ans= nld
No cover found
************************************************** ******************************
Running identify query with parameters:
{u'timeout': 30, u'title': u'Een vakantie naar de hel', u'authors': [u'Anna Lascaris'], u'identifiers': {u'isbn': u'9789402168921'}}
Using plugins: BOL_NL (4, 5, 3)
The log from individual plugins is below
..........
Starting cover download for: Een Vakantie Naar De Hel
Query: Een vakantie naar de hel [u'Anna Lascaris'] {u'isbn': u'9789402168921'}
****************************** BOL_NL Covers ******************************
Request extra headers: [(u'User-agent', u'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/72.0.3626.121 Safari/537.36')]
Failed to download valid cover
Took 1.16000008583 seconds
No cached cover found, running identify
Querying:
https://www.bol.com/nl/s/?section=ma...justedSection=
BOL_NL url: u'https://www.bol.com/nl/p/een-vakantie-naar-de-hel/9200000086230319/'
_parse_language: lang= Nederlands
_parse_language: ans= nld
No cover found
************************************************** ******************************
Running identify query with parameters:
{u'timeout': 30, u'title': u'De Bombos Couleps', u'authors': [u'Anna Lascaris'], u'identifiers': {u'isbn': u'9789402172256'}}
Using plugins: BOL_NL (4, 5, 3)
The log from individual plugins is below
****************************** BOL_NL (4, 5, 3) ******************************
....
Starting cover download for: De Bombos Couleps
Query: De Bombos Couleps [u'Anna Lascaris'] {u'isbn': u'9789402172256'}
****************************** BOL_NL Covers ******************************
Request extra headers: [(u'User-agent', u'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/73.0.3683.86 Safari/537.36')]
Failed to download valid cover
Took 1.22400021553 seconds
No cached cover found, running identify
Querying:
https://www.bol.com/nl/s/?originalSe...SearchContext=
BOL_NL url: u'https://www.bol.com/nl/p/de-bombos-couleps/9200000089137661/'
_parse_language: lang= Nederlands
_parse_language: ans= nld
No cover found
************************************************** ******************************
Running identify query with parameters:
{u'identifiers': {u'isbn': u'1230004405559'}, u'authors': [u'Ninja Paap-Luijten'], u'timeout': 30, u'title': u'Nachtwater'}
Using plugins: BOL_NL (4, 5, 3)
The log from individual plugins is below
****************************** BOL_NL (4, 5, 3) ******************************
.....
Starting cover download for: Nachtwater
Query: Nachtwater [u'Ninja Paap-Luijten'] {u'isbn': u'1230004405559'}
****************************** BOL_NL Covers ******************************
Request extra headers: [(u'User-agent', u'Mozilla/5.0 (Macintosh; Intel Mac OS X 10_14_3) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/73.0.3683.86 Safari/537.36')]
Failed to download valid cover
Took 1.13100004196 seconds
No cached cover found, running identify
Querying:
https://www.bol.com/nl/s/?searchtext...ggestFragment=
BOL_NL url: u'https://www.bol.com/nl/p/nachtwater/9300000020193961/'
_parse_language: lang= Nederlands
_parse_language: ans= nld
No cover found
************************************************** ******************************