Golang : Get S3 or CloudFront object or file information



Tags : golang s3 cloudfront etag header-informationmetadata

Here is a simple example on how to get the S3, CloudFront object (in fact, any file accessible from URL) information. Information such as Etag, X-Amz-Storage-Class, Last-Modified, Cache-Control or Content-Type values. This information is also known as metadata.

 package main

 import (
 "fmt"
 "net/http"
 "os"
 )

 func main() {
 url := "https://d1ohg4ss876yi2.cloudfront.net/preview/golang.png"

 response, err := http.Head(url)
 if err != nil {
 fmt.Println(err)
 os.Exit(1)
 }

 // Is our request ok?

 if response.StatusCode != http.StatusOK {
 fmt.Println(response.Status)
 os.Exit(1)
 // exit if not ok
 }

 for k, v := range response.Header {
 fmt.Println("Header :", k, " : ", v)
 }
 }

Sample output :

Header : Age : [1198]

Header : Etag : ["11ef76eda4cd556455088d69eb95bdc2"]

Header : Server : [AmazonS3]

Header : Date : [Wed, 18 Nov 2015 08:19:31 GMT]

Header : Cache-Control : [max-age=315360000]

Header : Last-Modified : [Fri, 13 Nov 2015 09:44:33 GMT]

Header : X-Cache : [Hit from cloudfront]

Header : Via : [1.1 04fb12f896eac18e91eac3e60e276ed8.cloudfront.net (CloudFront)]

Header : X-Amz-Cf-Id : [J7qrcfGsa9vssCAkavL8v8zqn1JMU4PneP2aMY4LyEKSLIRRREfg==]

Header : Content-Length : [113857]

Header : Connection : [keep-alive]

Header : Accept-Ranges : [bytes]

Header : Content-Type : [image/png]

Header : X-Amz-Storage-Class : [REDUCED_REDUNDANCY]

Affiliate :

Hire Golang Developers




Tags : golang s3 cloudfront etag header-informationmetadata

By Adam Ng

IF you gain some knowledge or the information here solved your programming problem. Please consider donating to the less fortunate or some charities that you like. Apart from donation, planting trees, volunteering or reducing your carbon footprint will be great too.


Advertisement