Go Language
Go Controls
- go-if-else
- go-switch
- go-for
- go-for-range
- go-goto
- go-break
- go-continue
- go-comments
- go-constants
- go-type-casting
Go Functions
Go Arrays
Go Strings
- go-string
- go-regex
Go Types
Go Map
- go-map
Go Error
- go-error
- go-recover
- go-defer
- go-panic
Go Concurrency
Go Time
Go Misc
Interview Questions
- go-interview

Go URL Parsing

Go has good support for url parsing. URL contains a scheme, authentication info, host, port, path, query params, and query fragment. we can parse URL and deduce what are the parameter is coming to the server and then process the request accordingly.

The net/url package has the required functions like Scheme, User, Host, Path, RawQuery etc.

Go URL Parsing Example 1

package main
import "fmt"
import "net"
import "net/url"
func main() {

	p := fmt.Println

	s := "Mysql://admin:password@serverhost.com:8081/server/page1?key=value&key2=value2#X"

	u, err := url.Parse(s)
	if err != nil {
		panic(err)
	}
	p(u.Scheme)	//prints Schema of the URL
	p(u.User)	// prints the parsed user and password
	p(u.User.Username())	//prints user's name
	pass, _ := u.User.Password()
	p(pass)		//prints user password
	p(u.Host) 		//prints host and port
	host, port, _ := net.SplitHostPort(u.Host)		 //splits host name and port
	p(host)		//prints host
	p(port)		//prints port
	p(u.Path)		//prints the path
	p(u.Fragment)		//prints fragment path value
	p(u.RawQuery)		//prints query param name and value as provided
	m, _ := url.ParseQuery(u.RawQuery)		//parse query param into map
	p(m)		//prints param map
	p(m["key2"][0])		//prints specific key value
}

Output:

mysql
admin:password
admin
password
serverhost.com:8081
serverhost.com
8081
/server/page1
X
key=value&key2=value2
map[key:[value] key2:[value2]]
value2

Go URL Parsing Example 2

package main

import (
	"io"
	"net/http"
)


func main() {
	http.HandleFunc("/company", func(res http.ResponseWriter, req *http.Request) {
		displayParameter(res, req)
	})
	println("Enter the url in browser:  http://localhost:8080/company?name=Tom&age=27")
	http.ListenAndServe(":8080", nil)
}
func displayParameter(res http.ResponseWriter, req *http.Request) {
	io.WriteString(res, "name: "+req.FormValue("name"))
	io.WriteString(res, "\nage: "+req.FormValue("age"))
}

Output:

Enter the url in browser: http://localhost:8080/company?name=Tom&age=27