Type URI,Title,Recommended HTTP Status Code,Reference
about:blank,See HTTP Status Code,N/A,[RFC9457]
https://iana.org/assignments/http-problem-types#date,Date Not Acceptable,400,"[RFC9458, Section 6.5.2]"
https://iana.org/assignments/http-problem-types#ohttp-key,Oblivious HTTP key configuration not acceptable,400,"[RFC9458, Section 5.3]"