Brotli for Nginx

Two months ago Google announced Brotli, a new compression format:

Brotli is a whole new data format. This new format allows us to get 20–26% higher compression ratios over Zopfli. In our study ‘Comparison of Brotli, Deflate, Zopfli, LZMA, LZHAM and Bzip2 Compression Algorithms’ we show that Brotli is roughly as fast as zlib’s Deflate implementation. At the same time, it compresses slightly more densely than LZMA and bzip2 on the Canterbury corpus. The higher data density is achieved by a 2nd order context modeling, re-use of entropy codes, larger memory window of past data and joint distribution codes. Just like Zopfli, the new algorithm is named after Swiss bakery products. Brötli means ‘small bread’ in Swiss German.

Compression is a big deal for web performance, being able to send the same file with fewer bytes is a big win.

There are now two Nginx modules for supporting Brotli compression: ngx_brotli from Google and ngx_brotli_module from CloudFlare.