https://mark2cure.org/document/pubtator/10364520.json reproducibly returns a 502 error Other valid doc requests (eg https://mark2cure.org/document/pubtator/16344560.json) return just fine. Bad doc IDs (eg https://mark2cure.org/document/pubtator/1.json https://mark2cure.org/document/pubtator/ABC.json) correctly returning 404.