From c058fa0fb22dc40ef0225b21a97578cddd0aaffa Mon Sep 17 00:00:00 2001 From: Florian Merz Date: Thu, 11 Feb 2021 14:51:05 +0100 Subject: unslug ru: move --- .../web/http/headers/content-encoding/index.html | 107 +++++++++++++++++++++ 1 file changed, 107 insertions(+) create mode 100644 files/ru/web/http/headers/content-encoding/index.html (limited to 'files/ru/web/http/headers/content-encoding') diff --git a/files/ru/web/http/headers/content-encoding/index.html b/files/ru/web/http/headers/content-encoding/index.html new file mode 100644 index 0000000000..0f54a68395 --- /dev/null +++ b/files/ru/web/http/headers/content-encoding/index.html @@ -0,0 +1,107 @@ +--- +title: Content-Encoding +slug: Web/HTTP/Заголовки/Content-Encoding +tags: + - Content-Encoding + - HTTP + - Headers +translation_of: Web/HTTP/Headers/Content-Encoding +--- +
{{HTTPSidebar}}
+ +

Content-Encoding - это сущность заголовка, используемая для сжатия медиа-типа. При наличии ее значение определяет кодировку, примененную к сущности body. Это позволяет клиенту информацию как декодировать body, чтобы получить медиа-тип ссылающийся на  заголовок Content-Type 

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Рекомендация - сжимать данные насколько это возможно и следовательно использовать это поле, но некоторые типы данных, такие как изображения в формате jpeg, уже сжаты. Иногда, использование дополнительного сжатия не уменьшает размер пакета и даже может сделать загрузку дольше.

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Header type{{Glossary("Entity header")}}
{{Glossary("Forbidden header name")}}no
+ +

Синтаксис

+ +
Content-Encoding: gzip
+Content-Encoding: compress
+Content-Encoding: deflate
+Content-Encoding: identity
+Content-Encoding: br
+
+// Multiple, in the order in which they were applied
+Content-Encoding: gzip, identity
+Content-Encoding: deflate, gzip
+
+ +

Директивы

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+
gzip
+
A format using the Lempel-Ziv coding (LZ77), with a 32-bit CRC. This is the original format of the UNIX gzip program. The HTTP/1.1 standard also recommends that the servers supporting this content-encoding should recognize x-gzip as an alias, for compatibility purposes.
+
compress
+
A format using the Lempel-Ziv-Welch (LZW) algorithm. The value name was taken from the UNIX compress program, which implemented this algorithm. Like the compress program, which has disappeared from most UNIX distributions, this content-encoding is not used by many browsers today, partly because of a patent issue (it expired in 2003).
+
deflate
+
Using the zlib structure (defined in RFC 1950) with the deflate compression algorithm (defined in RFC 1951).
+
identity
+
Indicates the identity function (i.e., no compression or modification). This token, except if explicitly specified, is always deemed acceptable.
+
br
+
A format using the Brotli algorithm.
+
+ +

Examples

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Compressing with gzip

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On the client side, you can advertise a list of compression schemes that will be sent along in an HTTP request. The {{HTTPHeader("Accept-Encoding")}} header is used for negotiating content encoding.

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Accept-Encoding: gzip, deflate
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The server responds with the scheme used, indicated by the Content-Encoding response header.

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Content-Encoding: gzip
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Note that the server is not obligated to use any compression method. Compression highly depends on server settings and used server modules.

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Specifications

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SpecificationTitle
{{RFC("7932", "Brotli Compressed Data Format")}}Brotli Compressed Data Format
{{RFC("7231", "Content-Encoding", "3.1.2.2")}}Hypertext Transfer Protocol (HTTP/1.1): Semantics and Content
{{RFC("2616", "Content-Encoding", "14.11")}}Content-Encoding
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Browser compatibility

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{{Compat("http.headers.Content-Encoding")}}

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See also

+ + -- cgit v1.2.3-54-g00ecf