[Metadata Source Plugin] BOL.com (NL)

[Pr.BarnArt]

Originally Posted by Dompie

I think BOL has changed something again. For books of recent date (from March 2026?), there is no response if you do not enter an ISBN number. With an ISBN number, everything works as normal. There is no error message, absolutely nothing, just no result without an ISBN.

Update 6.3.0. as a fix for search-results for books without an isbn.
Hope that will do.


Update available at the start of this thread and within calibre through preferences=>plugin-installer/update.

[Pr.BarnArt]

Originally Posted by Dompie

I think BOL has changed something again. For books of recent date (from March 2026?), there is no response if you do not enter an ISBN number. With an ISBN number, everything works as normal. There is no error message, absolutely nothing, just no result without an ISBN.

In v .6.3.0. fix searchresult for books without an isbn
Hope that will do.


New version as always available at thte start of this thread and within Calibre =>preferences=> plugin-update/installer

[Dompie]

6.3 works as designed!. 9 books withoout ISBN and no problems.
Thank You Pr.BarnArt

[Dompie]

I think BOL has changed the site again. Every single book is showing the same error message.
The logging:

Spoiler:

calibre, version 7.13.0
FOUT: Geen zoekresultaten gevonden: <p>Kan geen boeken vinden die overeenkomen met uw zoekopdracht. Probeer de zoekopdracht <b>minder specifiek</b> te maken. Gebruik bijvoorbeeld alleen de achternaam van de auteur en een enkel onderscheidend woord uit de titel.<p>Klik op 'Details weergeven' om het volledige logbestand weer te geven.

Running identify query with parameters:
{'title': 'De non van Ravensbrück', 'authors': ['Cathi Fleming'], 'identifiers': {'mobi-asin': '9789026186271'}, 'timeout': 30}
Using plugins: BOL_NL (6, 3, 0)
The log from individual plugins is below

****************************** BOL_NL (6, 3, 0) ******************************
Found 0 results
Downloading from BOL_NL took 0.2728753089904785
Querying: https://www.bol.com/nl/nl/s/?searcht...eryContextHook
Plugin BOL_NL failed
Traceback (most recent call last):
File "calibre\ebooks\metadata\sources\identify.py", line 47, in run
File "calibre_plugins.BOL_NL.__init__", line 306, in identify
File "mechanize\_mechanize.py", line 241, in open_novisit
File "mechanize\_mechanize.py", line 313, in _mech_open
mechanize._response.get_seek_wrapper_class.<locals >.httperror_seek_wrapper: HTTP Error 403: Forbidden

************************************************** ******************************
The identify phase took 0.40 seconds
The longest time (0.272875) was taken by: BOL_NL
Merging results from different sources
We have 0 merged results, merging took: 0.00 seconds

Even old books that worked perfectly with the plugin yesterday are now getting the same error message.

[Dompie]

Eeeeeeeeehhhhhhhhhhhhhh, I test it today and everything wordks as designed!!!!
I was too quick to report it. Next time, I'll just wait a day.

Sorry.

[echo1]

I had the same issue, but I'm happy it works again! Really happy with the plugin!

[Pr.BarnArt]

[Dompie]

This is a strange one: retrieving books is failing with an "HTTP Error 403: Forbidden." Even books that worked perfectly before are no longer working. If you copy the query string from the logs (https:....QueryContextHook) and execute it, you get the correct page from BOL.

Spoiler:

calibre, version 7.13.0
FOUT: Geen zoekresultaten gevonden: <p>Kan geen boeken vinden die overeenkomen met uw zoekopdracht. Probeer de zoekopdracht <b>minder specifiek</b> te maken. Gebruik bijvoorbeeld alleen de achternaam van de auteur en een enkel onderscheidend woord uit de titel.<p>Klik op 'Details weergeven' om het volledige logbestand weer te geven.

Running identify query with parameters:
{'title': 'De witte ruiter', 'authors': ['Bernard Cornwell'], 'identifiers': {}, 'timeout': 30}
Using plugins: BOL_NL (6, 3, 0)
The log from individual plugins is below

****************************** BOL_NL (6, 3, 0) ******************************
Found 0 results
Downloading from BOL_NL took 0.23013782501220703
Querying: https://www.bol.com/nl/nl/s/?searcht...eryContextHook
Plugin BOL_NL failed
Traceback (most recent call last):
File "calibre\ebooks\metadata\sources\identify.py", line 47, in run
File "calibre_plugins.BOL_NL.__init__", line 306, in identify
File "mechanize\_mechanize.py", line 241, in open_novisit
File "mechanize\_mechanize.py", line 313, in _mech_open
mechanize._response.get_seek_wrapper_class.<locals >.httperror_seek_wrapper: HTTP Error 403: Forbidden

************************************************** ******************************
The identify phase took 0.40 seconds
The longest time (0.230138) was taken by: BOL_NL
Merging results from different sources
We have 0 merged results, merging took: 0.00 seconds

[Pr.BarnArt]

Originally Posted by Dompie

This is a strange one: retrieving books is failing with an "HTTP Error 403: Forbidden." Even books that worked perfectly before are no longer working. If you copy the query string from the logs (https:....QueryContextHook) and execute it, you get the correct page from BOL.

.....
mechanize._response.get_seek_wrapper_class.<locals >.httperror_seek_wrapper: HTTP Error 403: Forbidden
.....

The error is similar to the one you noticed in your post on October 6th.
Maybe it will resolve itself within a day.
The issue is caused by Bol blocking requests because it detects a non-standard browser (i.e. mechanize), or perhaps due to Cloudflare protection. Fixing this is difficult and would likely require installing extra software, which is not a path I want to go down.
First, I will check over the next few days to see if the error still occurs

[Dompie]

OK I hadn't seen the 103 forbidden error on October 6th. Let's wait and see and extra software is not the path to go indeed.

[Dompie]

Originally Posted by Pr.BarnArt

The error is similar to the one you noticed in your post on October 6th.
....
First, I will check over the next few days to see if the error still occurs

You’re absolutely right, it’s working again!! Sorry!