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HTTP/1.1 Upgrade header

header field introduced in HTTP/1.1; in the exchange, the client begins by making a cleartext request, which is later upgraded to a newer HTTP protocol version or switched to a different protocol; connection upgrade must be requested by the client
Thing http_header Q5636136
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HTTP/1.1 Upgrade header

Summary

HTTP/1.1 Upgrade header is a HTTP header[1]. It draws 42 Wikipedia views per month (http_header category, ranking #2 of 2).[2]

Key Facts

  • HTTP/1.1 Upgrade header's instance of is recorded as HTTP header[3].
  • HTTP/1.1 Upgrade header's Freebase ID is recorded as /m/0gyvqr2[4].
  • HTTP/1.1 Upgrade header's described by source is recorded as RFC 2817: Upgrading to TLS Within HTTP/1.1[5].
  • HTTP/1.1 Upgrade header's used by is recorded as Q859938[6].
  • HTTP/1.1 Upgrade header's exact match is recorded as https://www.w3.org/2011/http-headers#upgrade[7].
  • HTTP/1.1 Upgrade header's Mozilla Developer Network article is recorded as Web/HTTP/Headers/Upgrade[8].

Why It Matters

HTTP/1.1 Upgrade header draws 42 Wikipedia views per month (http_header category, ranking #2 of 2).[2]

References

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

Direct Wikidata claims

  1. [3] ↑ . wikidata.org.
  2. [4] ↑ . wikidata.org.
  3. [5] ↑ . wikidata.org.
  4. [6] ↑ . wikidata.org.
  5. [7] ↑ . wikidata.org.
  6. [8] ↑ . wikidata.org.

Class ancestry

  1. [1] ↑ . Wikidata. wikidata.org.

Aggregate / graph-position facts

  1. [2] ↑ . Wikimedia Foundation. dumps.wikimedia.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). HTTP/1.1 Upgrade header. Retrieved May 3, 2026, from https://4ort.xyz/entity/http-1-1-upgrade-header
MLA “HTTP/1.1 Upgrade header.” 4ort.xyz Knowledge Graph, 4ort.xyz, 3 May. 2026, https://4ort.xyz/entity/http-1-1-upgrade-header.
BibTeX @misc{4ortxyz_http-1-1-upgrade-header_2026, author = {{4ort.xyz Knowledge Graph}}, title = {{HTTP/1.1 Upgrade header}}, year = {2026}, url = {https://4ort.xyz/entity/http-1-1-upgrade-header}, note = {Accessed: 2026-05-03}}
LLM prompt According to 4ort.xyz Knowledge Graph (aggregator of Wikidata, Wikipedia, and authoritative open-data sources): HTTP/1.1 Upgrade header — https://4ort.xyz/entity/http-1-1-upgrade-header (retrieved 2026-05-03)

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