Internal Server Error due to long query strings

For purposes of comparing validation results, I require to fetch the results assoicated with numerous model/test instances.
So queries such as following arise:

GET https://validation-v2.brainsimulation.eu/results-extended/?model_instance_id=e7e17b98-86fd-4ede-af2b-831642ca47c9&model_instance_id=20b57bd8-7076-4f46-a361-84255b06401c&model_instance_id=233a109e-d26f-4f50-809e-1aa52d3fa84c&model_instance_id=3342e542-5fb1-45aa-b7be-69e94f809160&model_instance_id=938807e6-0d28-4d8c-9d73-95f1df1af282&model_instance_id=403d865e-417c-45fe-97cf-83a9613ae664&model_instance_id=20e69189-ab22-4967-88a0-9e719a547380&model_instance_id=a5e4a43e-444a-49c3-9435-05ab934218ca&model_instance_id=f7153820-e3db-48b8-84ca-389c50d9298a&model_instance_id=cf81d7a3-5f42-4e2e-b884-6121c6f026ba&model_instance_id=d6713000-db8b-4c33-aabf-a13a5224b404&model_instance_id=da1b7cc5-c9af-46d1-81fe-bc4661077e7d&size=1000000

(I have also tested with /results/ end-point and have the same problem)

I get the following response:

500 Internal Server Error

Somewhat shorter queries seem to work (even though with delay):
GET https://validation-v2.brainsimulation.eu/results-extended/?model_instance_id=e7e17b98-86fd-4ede-af2b-831642ca47c9&model_instance_id=20b57bd8-7076-4f46-a361-84255b06401c&model_instance_id=233a109e-d26f-4f50-809e-1aa52d3fa84c&model_instance_id=3342e542-5fb1-45aa-b7be-69e94f809160

It would be useful if this problem can be fixed, and we can avoid making multiple calls as it affects performance (more overhead) and also leads to unnecessary 'hacky' coding.