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501 Not Implemented

HTTP response status code
Thing http_status_code Q64728500
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501 Not Implemented

Summary

501 Not Implemented is a HTTP status code[1].

Key Facts

  • 501 Not Implemented's instance of is recorded as HTTP status code[2].
  • 501 Not Implemented's follows is recorded as 500 Internal Server Error[3].
  • 501 Not Implemented's followed by is recorded as 502 Bad Gateway[4].
  • 501 Not Implemented's part of the series is recorded as HTTP status code[5].
  • 501 Not Implemented's described by source is recorded as RFC 7231: Hypertext Transfer Protocol (HTTP/1.1): Semantics and Content[6].
  • 501 Not Implemented's described by source is recorded as RFC 2616: Hypertext Transfer Protocol -- HTTP/1.1[7].
  • 501 Not Implemented's native label is recorded as Not Implemented[8].
  • 501 Not Implemented's code is recorded as 501[9].
  • 501 Not Implemented's NicoNicoPedia ID is recorded as 501 - not implemented[10].
  • 501 Not Implemented's Mozilla Developer Network article is recorded as Web/HTTP/Status/501[11].

References

Programmatic citations — every numbered marker resolves to a verifiable graph row below.

Direct Wikidata claims

  1. [2] ↑ . wikidata.org.
  2. [3] ↑ . wikidata.org.
  3. [4] ↑ . wikidata.org.
  4. [5] ↑ . wikidata.org.
  5. [6] ↑ . wikidata.org.
  6. [7] ↑ . wikidata.org.
  7. [8] ↑ . RFC 7231: Hypertext Transfer Protocol (HTTP/1.1): Semantics and Content. wikidata.org.
  8. [9] ↑ . RFC 7231: Hypertext Transfer Protocol (HTTP/1.1): Semantics and Content. wikidata.org.
  9. [10] ↑ . wikidata.org.
  10. [11] ↑ . wikidata.org.

Class ancestry

  1. [1] ↑ . Wikidata. wikidata.org.

📑 Cite this page

Use these citations when quoting this entity in research, articles, AI prompts, or wherever provenance matters. We aggregate Wikidata + Wikipedia + authoritative open-data sources; the stitched, scored, cross-referenced view is what 4ort.xyz contributes.

APA 4ort.xyz Knowledge Graph. (2026). 501 Not Implemented. Retrieved May 3, 2026, from https://4ort.xyz/entity/501-not-implemented
MLA “501 Not Implemented.” 4ort.xyz Knowledge Graph, 4ort.xyz, 3 May. 2026, https://4ort.xyz/entity/501-not-implemented.
BibTeX @misc{4ortxyz_501-not-implemented_2026, author = {{4ort.xyz Knowledge Graph}}, title = {{501 Not Implemented}}, year = {2026}, url = {https://4ort.xyz/entity/501-not-implemented}, note = {Accessed: 2026-05-03}}
LLM prompt According to 4ort.xyz Knowledge Graph (aggregator of Wikidata, Wikipedia, and authoritative open-data sources): 501 Not Implemented — https://4ort.xyz/entity/501-not-implemented (retrieved 2026-05-03)

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