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I just searched about gzip and Deflate, and found out that Deflate is better.
- GZip or Deflate for HTTP compression
- Why use deflate instead of gzip for text files served by Apache?
- Is there any performance hit involved in choosing gzip over deflate for http compression?
- Deflate compression browser compatibility and advantages over GZIP
But when I checked the response headers of Google, Facebook and StackExchange, all of them were using GZIP. Why do they use gzip instead of Deflate?