Add Zstandard (zstd) and mark Brotli as standard (mdn#32465)

* Add Zstandard (zstd) and mark Brotli as standard * Remove non-standard from accept-encoding * Add glossary entry * Wording * Update files/en-us/web/http/headers/content-encoding/index.md Co-authored-by: Brian Thomas Smith <[email protected]> * Update files/en-us/glossary/zstandard_compression/index.md Co-authored-by: Brian Thomas Smith <[email protected]> * Update files/en-us/glossary/zstandard_compression/index.md Co-authored-by: Brian Thomas Smith <[email protected]> * Add glossary links * Fix capitlaisation * Fix links and add redirects * Fix linting --------- Co-authored-by: Brian Thomas Smith <[email protected]>
larowlan · Mar 4, 2024 · ad2254c · ad2254c
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diff --git a/files/en-us/_redirects.txt b/files/en-us/_redirects.txt
@@ -3569,6 +3569,7 @@
 /en-US/docs/Glossary/Block/Block_(CSS)	/en-US/docs/Glossary/Block/CSS
 /en-US/docs/Glossary/Block/Block_(scripting)	/en-US/docs/Glossary/Block/Scripting
 /en-US/docs/Glossary/Boot2Gecko	/en-US/docs/Glossary/Firefox_OS
+/en-US/docs/Glossary/Brotli	/en-US/docs/Glossary/Brotli_compression
 /en-US/docs/Glossary/Bézier_curve	/en-US/docs/Glossary/Bezier_curve
 /en-US/docs/Glossary/CSS_property	/en-US/docs/Glossary/property/CSS
 /en-US/docs/Glossary/Cleartext	/en-US/docs/Glossary/Plaintext
@@ -3581,6 +3582,7 @@
 /en-US/docs/Glossary/Empty_element	/en-US/docs/Glossary/Void_element
 /en-US/docs/Glossary/Error	/en-US/docs/Glossary/Exception
 /en-US/docs/Glossary/First_interactive	/en-US/docs/Glossary/First_CPU_idle
+/en-US/docs/Glossary/GZip	/en-US/docs/Glossary/GZip_compression
 /en-US/docs/Glossary/Global_attribute	/en-US/docs/Web/HTML/Global_attributes
 /en-US/docs/Glossary/Grid_Rows	/en-US/docs/Glossary/Grid_Row
 /en-US/docs/Glossary/Hash_function	/en-US/docs/Glossary/Cryptographic_hash_function

diff --git a/files/en-us/glossary/brotli_compression/index.md b/files/en-us/glossary/brotli_compression/index.md
@@ -1,5 +1,5 @@
 ---
-title: Brotli
+title: Brotli compression
 slug: Glossary/Brotli_compression
 page-type: glossary-definition
 ---

diff --git a/files/en-us/glossary/lossless_compression/index.md b/files/en-us/glossary/lossless_compression/index.md
@@ -6,7 +6,7 @@ page-type: glossary-definition
 
 {{GlossarySidebar}}
 
-**Lossless compression** is a class of data compression algorithms that allows the original data to be perfectly reconstructed from the compressed data. Lossless compression methods are reversible. Examples of lossless compression include {{glossary("GZIP")}}, {{glossary("Brotli")}}, WebP, and {{glossary("PNG")}},
+**Lossless compression** is a class of data compression algorithms that allows the original data to be perfectly reconstructed from the compressed data. Lossless compression methods are reversible. Examples of lossless compression include {{glossary("GZip_compression", "gzip")}}, {{glossary("Brotli_compression", "brotli")}}, {{glossary("WebP")}}, and {{glossary("PNG")}},
 
 {{glossary("Lossy compression")}}, on the other hand, uses inexact approximations by discarding some data from the original file, making it an irreversible compression method.
 

diff --git a/files/en-us/glossary/zstandard_compression/index.md b/files/en-us/glossary/zstandard_compression/index.md
@@ -0,0 +1,21 @@
+---
+title: Zstandard compression
+slug: Glossary/Zstandard_compression
+page-type: glossary-definition
+---
+
+{{GlossarySidebar}}
+
+**Zstandard** is a general-purpose lossless compression algorithm.
+
+Zstandard, or `zstd` as short version, is a fast lossless compression algorithm, targeting real-time compression scenarios at zlib-level and better compression ratios. It's backed by a very fast entropy stage, provided by [Huff0 and FSE library](https://github.com/Cyan4973/FiniteStateEntropy). It often offers better compression ratios than {{glossary("Brotli_compression", "brotli")}} at equivalent CPU costs, or better CPU costs at equivalent compression ratios.
+
+For browser support, see [Content-Encoding: Browser compatibility](/en-US/docs/Web/HTTP/Headers/Content-Encoding#browser_compatibility).
+
+## See also
+
+- [Zstandard RFC](https://tools.ietf.org/html/rfc8878)
+- [Zstandard home page](https://facebook.github.io/zstd/)
+- [Zstandard GitHub repository](https://github.com/facebook/zstd)
+- [Zstandard](https://en.wikipedia.org/wiki/Zstandard) on Wikipedia
+- [Zstandard on Caniuse](https://caniuse.com/#feat=zstandard)
diff --git a/files/en-us/web/http/headers/accept-encoding/index.md b/files/en-us/web/http/headers/accept-encoding/index.md
@@ -41,6 +41,7 @@ Accept-Encoding: gzip
 Accept-Encoding: compress
 Accept-Encoding: deflate
 Accept-Encoding: br
+Accept-Encoding: zstd
 Accept-Encoding: identity
 Accept-Encoding: *
 
@@ -58,6 +59,8 @@ Accept-Encoding: deflate, gzip;q=1.0, *;q=0.5
   - : A compression format that uses the [zlib](https://en.wikipedia.org/wiki/Zlib) structure with the [_deflate_](https://en.wikipedia.org/wiki/DEFLATE) compression algorithm.
 - `br`
   - : A compression format that uses the [Brotli](https://en.wikipedia.org/wiki/Brotli) algorithm.
+- `zstd`
+  - : A compression format that uses the [Zstandard](https://en.wikipedia.org/wiki/Zstd) algorithm.
 - `identity`
   - : Indicates the identity function (that is, without modification or compression). This value is always considered as acceptable, even if omitted.
 - `*`
@@ -72,6 +75,8 @@ Accept-Encoding: gzip
 
 Accept-Encoding: gzip, compress, br
 
+Accept-Encoding: gzip, compress, br, zstd
+
 Accept-Encoding: br;q=1.0, gzip;q=0.8, *;q=0.1
 ```
 
@@ -88,3 +93,6 @@ Accept-Encoding: br;q=1.0, gzip;q=0.8, *;q=0.1
 - HTTP [content negotiation](/en-US/docs/Web/HTTP/Content_negotiation)
 - A header with the result of the content negotiation: {{HTTPHeader("Content-Encoding")}}
 - Other similar headers: {{HTTPHeader("TE")}}, {{HTTPHeader("Accept")}}, {{HTTPHeader("Accept-Language")}}
+- {{Glossary("Brotli compression")}}
+- {{Glossary("GZip compression")}}
+- {{Glossary("Zstandard compression")}}
diff --git a/files/en-us/web/http/headers/content-encoding/index.md b/files/en-us/web/http/headers/content-encoding/index.md
@@ -35,6 +35,7 @@ Content-Encoding: gzip
 Content-Encoding: compress
 Content-Encoding: deflate
 Content-Encoding: br
+Content-Encoding: zstd
 
 // Multiple, in the order in which they were applied
 Content-Encoding: deflate, gzip
@@ -59,7 +60,9 @@ Content-Encoding: deflate, gzip
     structure (defined in {{rfc(1950)}}) with the [deflate](https://en.wikipedia.org/wiki/Deflate) compression
     algorithm (defined in {{rfc(1951)}}).
 - `br`
-  - : A format using the [Brotli](https://en.wikipedia.org/wiki/Brotli) algorithm.
+  - : A format using the [Brotli](https://en.wikipedia.org/wiki/Brotli) algorithm structure (defined in {{rfc(7932)}}).
+- `zstd` {{experimental_inline}}
+  - : A format using the [Zstandard](https://en.wikipedia.org/wiki/Zstd) algorithm structure (defined in {{rfc(8878)}}).
 
 ## Examples
 
@@ -95,3 +98,6 @@ depends on server settings and used server modules.
 
 - {{HTTPHeader("Accept-Encoding")}}
 - {{HTTPHeader("Transfer-Encoding")}}
+- {{Glossary("Brotli compression")}}
+- {{Glossary("GZip compression")}}
+- {{Glossary("Zstandard compression")}}