Golang : Get and Set User-Agent examples
Problem :
You want to detect User-Agent of your web application users and also setup your own User-Agent name for your Golang application.
How to get and set User-Agent in Golang application?
Solution :
Example 1 :
package main
import (
"fmt"
"net/http"
)
func getUserAgent(w http.ResponseWriter, r *http.Request) {
ua := r.Header.Get("User-Agent")
fmt.Printf("user agent is: %s \n", ua)
w.Write([]byte("user agent is " + ua))
}
func main() {
http.HandleFunc("/", getUserAgent)
http.ListenAndServe(":8080", nil)
}
Example 2:
package main
import (
"fmt"
"net/http"
)
func getUserAgent(w http.ResponseWriter, r *http.Request) {
ua := r.UserAgent() //<---- simpler and faster!
fmt.Printf("user agent is: %s \n", ua)
w.Write([]byte("user agent is " + ua))
}
func main() {
http.HandleFunc("/", getUserAgent)
http.ListenAndServe(":8080", nil)
}
To set User-Agent for your Golang application, first create a client and set client's request header with [your user-agent name] before executing the request.
For instance :
client := &http.Client{}
request, err := http.NewRequest("GET", "http://example.com", nil)
if err != nil {
log.Fatalln(err)
}
request.Header.Set("User-Agent", "[your user-agent name]")
resp, err := client.Do(req)
The web site example.com will detect your program User-Agent as whatever name you choose for [your user-agent name].
Reference :
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
+25.1k Golang : Calculate future date with time.Add() function
+4.2k Golang : Pad file extension automagically
+7.7k Golang : Find network service name from given port and protocol
+12.8k Golang : Chunk split or divide a string into smaller chunk example
+18.2k Golang : Measure http.Get() execution time
+18.2k Golang : Compare floating-point numbers
+6.7k Gogland : Where to put source code files in package directory for rookie
+30.1k Golang : Math pow(the power of x^y) example
+17.4k Golang : Set, Get and List environment variables
+8.1k Golang : Generate Codabar
+5.6k Golang : Humanize and Titleize functions
+10.2k Golang : Simple file scaning and remove virus example