caching-hashed-content.go

var (
  // Match assets with hashes eg. main.347845.js, button.9029893.css
  hashedPatternRegex = regexp.MustCompile(`[\w-/]\.[0-9,a-z]{20}\.(js|css)$`)
  isHashedAsset      = hashedPatternRegex.MatchString
)

func CacheHeaders(staticPath string) gin.HandlerFunc {
  return func(c *gin.Context) {
    r := c.Request.URL.Path
    // Set a max age of 1-year for js and css with hashes
    if isHashedAsset(r) {
      c.Header("Cache-Control", "max-age=31536000, immutable")
    }
    c.Next()
  }
}