根据HTTP Archive的2025 Web Almanac数据，gzip、Brotli和zstd是当前网络传输中使用最广泛的三种压缩格式1。其中，Brotli已成为CDN流量中使用最多的格式，而gzip在非CDN流量中占据主导地位1。这三种格式在处理文件拼接时存在显著的技术差异。
gzip可以通过简单的cat命令实现文件拼接，但浏览器和某些HTTP客户端对拼接后的内容处理不一定正确1。相比之下，Brotli的Google官方实现原本不支持类似gzip的拼接方式，不过rust-brotli在2025年新增了-appendable、-catable等标志来支持这一功能1。与前两者不同的是，zstd从设计初期就被构建为可在网络环境中拼接的格式1。zstd已在2025年成为最新版本的所有主要消费者平台都支持的格式1。
虽然zlib提供了gzjoin.c作为gzip拼接的参考实现，但大多数编程语言的gzip API中都缺少此功能1。
Three major compression formats dominate web traffic, each with distinct capabilities for handling concatenated streams. According to the 2025 Web Almanac from HTTP Archive, gzip, Brotli, and zstd are the primary compression formats in use 1. Brotli has emerged as the most widely deployed format across CDN traffic, while gzip remains dominant in non-CDN environments 1. By 2025, zstd achieved support across all major consumer platforms, marking a significant milestone for the newer format 1.
The practical differences between these formats become apparent when handling concatenated compressed data. Gzip allows simple concatenation through basic command-line tools like cat, though browsers and certain HTTP clients may not reliably process the resulting streams 1. Brotli's official Google implementation lacks native support for this capability, but the Rust implementation added concatenation features including -appendable and -catable flags in 2025 1. In contrast, zstd was architected from the outset to support concatenation in network environments 1. While zlib provides gzjoin.c as a reference implementation for gzip concatenation, this functionality remains absent from most programming language gzip APIs 1.
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