Deprecating the "X-" Prefix and Similar Constructs in Application Protocols, June 2012
- Canonical URL:
- File formats:
- BEST CURRENT PRACTICE
- P. Saint-Andre
- appsawg (app)
Cite this BCP: TXT
Discuss this RFC: Send questions or comments to firstname.lastname@example.org
Historically, designers and implementers of application protocols have often distinguished between standardized and unstandardized parameters by prefixing the names of unstandardized parameters with the string "X-" or similar constructs. In practice, that convention causes more problems than it solves. Therefore, this document deprecates the convention for newly defined parameters with textual (as opposed to numerical) names in application protocols. This memo documents an Internet Best Current Practice.
For the definition of Status, see RFC 2026.
For the definition of Stream, see RFC 4844.