Both NodeNorm-dev and NodeNorm-prod are reporting that they don’t have any semantic types at the /get_semantic_types endpoint, which means that the /get_curie_prefixes endpoint doesn't work either. This is probably an error in loading the appropriate data into redis_connection3:

https://github.com/TranslatorSRI/NodeNormalization/blob/4b2caf9326ba5de6a8f2709a13e1823ff7c404ac/node_normalizer/server.py#L213-L232

Note that the documentation for both of these endpoints uses the old semantic types as examples and should also be fixed.