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2025-09-23 Update From: SLTechnology News&Howtos shulou NAV: SLTechnology News&Howtos > Servers >
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This article will explain in detail for everyone. The content of the article is of high quality. Therefore, Xiaobian shares it with you for reference. I hope you will have a certain understanding of relevant knowledge after reading this article.
Gzip compression algorithm
Gzip is based on the DEFLATE algorithm, which is a combination of LZ77 and Huffman coding, originally used for file compression on UNIX systems. Gzip encoding on HTTP protocol is a technology used to improve the performance of Web applications. Web servers and clients (browsers) must support Gzip together. The current mainstream browsers support Gzip compression, including IE6, IE7, IE8, IE9, FireFox, Google Chrome, Opera, etc.
Brotli compression algorithm
Google introduced its lossless compression algorithm Brotli in September 2015. Brotli compresses data using a variant of LZ77 algorithm, Huffman encoding, and second-order text modeling, and has higher compression efficiency than other compression algorithms.
Brotli compression algorithm has many characteristics, the most typical are the following three:
For common Web resource content, Brotli's performance is 17-25% better than Gzip;
When Brotli compression level is 1, the compression ratio is higher than when Gzip compression level is 9 (the highest);
Brotli can still provide very high compression rates when processing different HTML documents.
In addition, with the exception of IE and Opera Mini, almost all major browsers already support the Brotli algorithm.
Before opening VS after opening
"Intelligent compression" is mainly suitable for web page image acceleration and other scenarios. It can compress static web page files, effectively reduce the size of user transmission content, accelerate distribution effect and save CDN cost at the same time. Google's Brotli compression algorithm increases compression by 20%, allowing end users to load pages faster without increasing CPU consumption.
Users can adjust the compression level according to their own needs. The higher the compression level, the greater the compression rate. Therefore, the size of the transmission content is reduced to the maximum extent, and a better use experience is brought to the end user.
Before Not On: Turn off Gzip and Brotli features
After opening: open Gzip and Brotli at the same time, set compression level to 5
When Gzip and Brotli compression algorithms are enabled at the same time, Brotli compression priority is higher than Gzip. When the client supports both compression algorithms, Brotli version of the resource file will be returned first. In the above image, both Gzip and Brotli are turned on, but the compression algorithm used is Brotli, and the compression level is 5.
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