Golang : How to get URL port?



Tags : golang url parse splithostport

From the previous tutorial on how to break down a URL string, a reader emailed me wanting to know if there is a way to get the port number directly from the raw URL?

For example :

 rawURL := "http://username:password@searchengine.com:8080/testpath/?q=socketloop.com#TestFunc"

and get the port number 8080 with a function.

From my research, there is a function in the net package ... the net/SplitHostPort() function is able to do just that, but with the condition that the URL is in the form of "host:port", "[host]:port" or "[ipv6-host%zone]:port"

To use net/SplitHostPort() function on rawURL will produce this error message :

too many colons in address http://username:password@searchengine.com:8080/testpath/?q=socketloop.com#TestFunc

and therefore it is recommended to parse the rawURL first

 // Parse the URL and ensure there are no errors.
 url, err := url.Parse(rawURL)
 if err != nil {
  panic(err)
 }

and apply the SplitHostPort() function on url.Host

 shost, sport, err := net.SplitHostPort(url.Host)
 fmt.Println("Split Host is : ", shost)
 fmt.Println("Split Port is : ", sport)

Here's complete code :

 package main

 import (
 "fmt"
 "net"
 "net/url"
 "strings"
 )

 func main() {

 rawURL := "http://username:password@searchengine.com:8080/testpath/?q=socketloop.com#TestFunc"

 fmt.Println("URL : ", rawURL)

 // Parse the URL and ensure there are no errors.
 url, err := url.Parse(rawURL)
 if err != nil {
 panic(err)
 }

 // see http://golang.org/pkg/net/url/#URL
 // scheme://[userinfo@]host/path[?query][#fragment]

 // get the Scheme
 fmt.Println("Scheme : ", url.Scheme)

 // get the User information
 fmt.Println("Username : ", url.User.Username())

 password, set := url.User.Password()
 fmt.Println("Password : ", password)
 fmt.Println("Password set : ", set)

 // get the Host
 fmt.Println("Raw host : ", url.Host)

 // to get the Port number, split the Host
 hostport := strings.Split(url.Host, ":")
 host := hostport[0]
 port := hostport[1]

 fmt.Println("Host : ", host)
 fmt.Println("Port : ", port)

 // or use net.SplitHostPort
 // won't work with rawURL string
 shost, sport, err := net.SplitHostPort(url.Host)

 fmt.Println("Split Host is : ", shost)
 fmt.Println("Split Port is : ", sport)

 if err != nil {
 fmt.Println(err)
 }

 // get the Path
 fmt.Println("Path : ", url.Path)

 // get the RawQuery
 fmt.Println("Raw Query ", url.RawQuery)

 // get the fragment
 fmt.Println("Fragment : ", url.Fragment)

 }

Output :

URL : http://username:password@searchengine.com:8080/testpath/?q=socketloop.com#TestFunc

Scheme : http

Username : username

Password : password

Password set : true

Raw host : searchengine.com:8080

Host : searchengine.com

Port : 8080

Split Host is : searchengine.com

Split Port is : 8080

Path : /testpath/

Raw Query q=socketloop.com

Fragment : TestFunc

Reference :

http://golang.org/pkg/net/#SplitHostPort

  See also : Golang : Parsing or breaking down URL



Tags : golang url parse splithostport

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.


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