Golang : Get S3 or CloudFront object or file information
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]
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
Tutorials
+4.1k Golang : Constant and variable names in native language
+15.4k Golang : How to implement two-factor authentication?
+15.7k Golang : How to tell if a file is compressed either gzip or zip ?
+9.1k Golang : Wait and sync.WaitGroup example
+6.9k Golang : How to feed or take banana with Gorilla Web Toolkit Session package
+7.8k Golang : Build and compile multiple source files
+9.3k JavaScript/JQuery : Detect or intercept enter key pressed example
+5.6k Golang : Derive cryptographic key from passwords with Argon2
+7k Golang : Append and add item in slice
+4.6k Golang : What is StructTag and how to get StructTag's value?
+4.4k Javascript : How to loop over and parse JSON data?
+5.2k Golang : How to solve "too many .rsrc sections" error?