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[bioontology-support] Internet server error when downloading ontology classes

Erik Fäßler erik.faessler at
Thu Dec 19 00:29:25 PST 2013

Dear Bioontology-Team,

I have an issue with several ontologies when I try to download all their classes using the BioPortal 4.0 API.
What happens is that I am able to download a portion of the ontology, i.e. all pages up to a particular point. Then, I get the error message “Internal server error”.

The Ontology “VANDF” is one example for this problem. I try to download its classes using the following parameters:


I get the “Internal server error” message consistently after I have successfully downloaded page 26 of 63. I tried multiple times but I never get page no. 27.

I wonder wether I did something wrong or if the ontology is actually not meant for download or if there really is an error on the server side. As I said, I have this issue with other ontologies as well.

Thank you and best regards,


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