How to cache static files?

[zzwind]

Every static file http state code is 200
how to cache static files?
change satat code 200 to 304

[ghost]

The status code 304 would not indicate a cached file but one was not modified.

But you are wrong. This is enough to enable HTTP Conditional Get:

r := gin.Default()
r.Static("/assets", "./assets")

A file in assets is returned including the HTTP header Last-Modified. The next request by the browser will send the corresponding If-Modified-Since header which Gin will respond to with 304 Not Modified.

[zzwind]

@lutzhorn This is my code:

r := gin.Default()
r.Static("/assets", "web/public/")

But every refurbish browser,the css,js file will return 200 ( NOT from disk cache.)
How can i return 200 from disk cache.
Set http header can do this?

[yalay]

+1

[appleboy]

See the following example for gin Handler:

// ViewHandler support dist handler from UI
func ViewHandler() gin.HandlerFunc {
	fileServer := http.FileServer(dist.HTTP)
	data := []byte(time.Now().String())
	etag := fmt.Sprintf("%x", md5.Sum(data))

	return func(c *gin.Context) {
		c.Header("Cache-Control", "public, max-age=31536000")
		c.Header("ETag", etag)

		if match := c.GetHeader("If-None-Match"); match != "" {
			if strings.Contains(match, etag) {
				c.Status(http.StatusNotModified)
				return
			}
		}

		fileServer.ServeHTTP(c.Writer, c.Request)
	}
}

[zav8]

If you are using Chrome, maybe you should check if the "Disable cache" option is enabled.

Just with the simple r.Static(), 304 showed after I disabled this.

[liyishuai]

@appleboy's example is slightly inconsistent with HTTP standard.

	etag := fmt.Sprintf("%x", md5.Sum(data))

MD5 sum is a weak validator:

a validator is weak if it is shared by two or more representations of a given resource at the same time, unless those representations have identical representation data

Therefore, the ETag should be ("W/%x", md5.Sum(data)).

[vladtreny]

Hello,
Is it possible to disable Last-Modified header when using r.Static("/assets", "./assets") ?