I tried again myself with your account klaus_schneider the method getMyOpenItemFixedPriceList with max. 10 items, and it works fine.
Nevertheless, you have more than 80 000 items in this list. But you can only get max 50 000 items. If you don't specify the numberOfItems you get an explicit error inviting you to use this parameter.
I have tested with 10 items all the functions, and here is the result :
Auctions :
- getMySoldItemAuctionList : works fine
- getMyOpenItemAuctionList : works fine
- getMyClosedUnsoldItemAuctionList : works fine
Fixed price :
- getMySoldItemFixedPriceList : works fine
- getMyOpenItemFixedPriceList : works fine
- getMyClosedUnsoldItemFixedPriceList : the only one to have a problem of "error fetching HTTP headers". I will try to extend to allocated time and memory and will give you feedback when it is done.
We stay at your disposal for any further information.
Kind regards,
Quentin from Delcampe Technical Team.