Estimate compression level
A Chrome browser extension that estimates the HTTP compression level of the page.
什么是Estimate compression level？
Estimate compression level是由Leon Brocard开发的Chrome扩展程序，该扩展的主要功能是“A Chrome browser extension that estimates the HTTP compression level of the page.”。
扩展截图
下载Estimate compression level扩展crx文件
下载Estimate compression level扩展crx格式的文件，手动将Chrome插件安装到浏览器中，也可以将crx文件分享给朋友，轻松安装Chrome插件。
扩展使用说明
Background
Compression is a core feature of HTTP that improves transfer speed, cache bandwidth utilization and cache utilization.
Lossless data compression algorithms development led to the LZW algorithm (1984), used by the compress application (1985), and then the PKZIP application (1991) with its DEFLATE algorithm which was then used in the gzip format (1992). The zlib library (1995) became a de facto standard compression library for gzip data.
HTTP/1.1 in 1999 (RFC 2616) added support for gzip, compress and deflate compression as content encodings. gzip compression quickly became the default as it compressed better than compress, which used the patented LZW algorithm, and as Microsoft incorrectly implemented deflate as a broken raw deflate stream instead of the correct deflate stream inside a zlib format wrapper.
Compression algorithms generally define a file format and how to decompress it. This allows the user to pick an appropriate compression level: either fast compression, which compresses quickly, but doesn't compress very small or instead best compression, which compresses slowly but generates a smaller output.
With gzip and zlib these levels range from 1 (fast) to 9 (best), with a default of 6.
When you browse to a page with this extension and the content is compressed with gzip, a little badge is shown with the estimated compression level.
If the compression was achieved with a gzip compressor other than zlib, a fractional estimate of zlib compression level is shown.
How does it work?
The chrome extension notes the Content-Length of the page as it is loaded, then fetches the page again, tries to compress it with a variety of levels and then displays the result.
This uses more network and CPU. Use sparingly.
TODO
Some websites use the newer Brotli compression algorithm instead of gzip. This extension does not support Brotli yet. 扩展基本信息
| 名称 |  Estimate compression level |
| ID | lgogndmdpoegjafbbedeedmeofohbopo |
| 官方URL | https://chromewebstore.google.com/detail/estimate-compression-leve/lgogndmdpoegjafbbedeedmeofohbopo |
| 简介 | A Chrome browser extension that estimates the HTTP compression level of the page. |
| 文件大小 | 520 KB |
| 安装次数 | 98 |
| 当前版本 | 0.0.1 |
| 更新时间 | 2022-03-17 |
| 上架时间 | 2022-03-17 |
| 评分 | 1.00/5 共1次评分 |
| 开发者 | Leon Brocard |
| 电子邮箱 | [email protected] |
| 付费类型 | free |
| 扩展官网 | https://github.com/fastly/chrome-extension-estimate-compression-level |
| 帮助页面URL | https://github.com/fastly/chrome-extension-estimate-compression-level |
| 支持的语言 | en |
| manifest.json | |
{
"update_url": "https:\/\/clients2.google.com\/service\/update2\/crx",
"manifest_version": 3,
"name": "Estimate compression level",
"version": "0.0.1",
"action": {
"default_icon": {
"128": "images\/128.png"
}
},
"description": "A Chrome browser extension that estimates the HTTP compression level of the page.",
"icons": {
"128": "images\/128.png"
},
"background": {
"service_worker": "background.js",
"type": "module"
},
"host_permissions": [
"http:\/\/*\/*",
"https:\/\/*\/*"
],
"permissions": [
"webRequest",
"webNavigation"
]
} | |
