Hypertext Transfer Protocol (HTTP) Problem Types

Created

  • 2023-05-02

Last Updated

  • 2026-06-26

Available Formats

HTTP Problem Types

Registration Procedure(s)

  • Specification Required

Expert(s)

  • Mark Nottingham, Sanjay Dalal

Reference

Note

New problem types and changes to existing ones can be requested using the registration request interface or the HTTPAPI mailing list.

Available Formats

Type URI Title Recommended HTTP Status Code Reference
about:blank See HTTP Status Code N/A RFC 9457
https://iana.org/assignments/http-problem-types#date Date Not Acceptable 400 RFC 9458, Section 6.5.2
https://iana.org/assignments/http-problem-types#ohttp-key Oblivious HTTP key configuration not acceptable 400 RFC 9458, Section 5.3
https://iana.org/assignments/http-problem-types#digest-unsupported-algorithms Unsupported Hashing Algorithms 400 RFC-ietf-httpapi-digest-fields-problem-types-06, Section 3.1
https://iana.org/assignments/http-problem-types#digest-invalid-values Invalid Digest Values 400 RFC-ietf-httpapi-digest-fields-problem-types-06, Section 3.2
https://iana.org/assignments/http-problem-types#digest-mismatched-values Mismatched Digest Values 400 RFC-ietf-httpapi-digest-fields-problem-types-06, Section 3.3