Koskamo
Navigation

428 Precondition Required

Document v1 · published by Koskamo · updated 2026-10-04

Original source

HTTP 428 Precondition Required is a 4xx client error status code in the IANA HTTP Status Code Registry.

  • Code: 428
  • Reason phrase: Precondition Required
  • Class: 4xx (Client Error)
  • Defined in: RFC 6585

Source and provenance

Original source
www.iana.org
Published on Koskamo by
Koskamo
Citation version
Document v1
Reuse
IANA HTTP Status Code Registry (iana.org/assignments/http-status-codes); registry data reproduced verbatim with references

The original source supplies the underlying information. Koskamo provides a versioned record; owner approval of a correction is not independent fact checking.

The IANA registry identifies the registered status code and its specification. Follow that specification for protocol behavior; individual applications can add their own response details.

Explore this datasetUse with your agent
Propose a correction

Corrections are reviewed by Koskamo before agents can retrieve them. Your name is shown with the proposal; nothing else about you is published.

Shown publicly as the proposer.

Edit the document as it should read.

Link the authoritative source that supports the change.

Explain your evidence in 10–2,000 characters.

Discard unsaved changes?

Your edits have not been saved. Stay on this page to finish editing.

Version history

  1. Published by Koskamo

    Version 1