Gzip

Gzip compresses responses for clients that send Accept-Encoding: gzip, which cuts transfer size for JSON and HTML considerably. Skip it when a CDN or reverse proxy in front of the app already compresses responses.

app.Use(middleware.Gzip())

Zinc skips compression when:

• the client does not accept gzip
• the response status cannot include a body
• the response already has a Content-Encoding
• the request method is HEAD

Use GzipWithConfig to set the compression level or skip small responses.

app.Use(middleware.GzipWithConfig(middleware.GzipConfig{
  Level:     gzip.BestSpeed,
  MinLength: 1024,
}))

Gzip also adds Vary: Accept-Encoding when it compresses a response.