# 501 Not Implemented

> HTTP response status code

**Wikidata**: [Q64728500](https://www.wikidata.org/wiki/Q64728500)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/HTTP_501)  
**Source**: https://4ort.xyz/entity/501-not-implemented


## References

1. RFC 7231: Hypertext Transfer Protocol (HTTP/1.1): Semantics and Content