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/*
Title: 53.URL_Parsing.go
Author: OpenSource
Date: 2017-05-23
Description: For Study
URLs provide a uniform way to locate resources. Here’s how to parse URLs in Go.
*/
package main
import "fmt"
import "net"
import "net/url"
func main(){
fmt.Println("53.URL_Parsing.go---------Start------------\n\n")
// We’ll parse this example URL, which includes a scheme, authentication info,
// host, port, path, query params, and query fragment.
s := "postgres://user:pass@host.com:5432/path?k=v#f"
// Parse the URL and ensure there are no errors.
u, err := url.Parse(s)
if err != nil {
panic(err)
}
// Accessing the scheme is straightforward.
fmt.Println(u.Scheme)
// User contains all authentication info;
// call Username and Password on this for individual values.
fmt.Println(u.User)
fmt.Println(u.User.Username())
p, _ := u.User.Password()
fmt.Println(p)
// The Host contains both the hostname and the port, if present.
// Use SplitHostPort to extract them.
fmt.Println(u.Host)
host, port, _ := net.SplitHostPort(u.Host)
fmt.Println(host)
fmt.Println(port)
// Here we extract the path and the fragment after the #.
fmt.Println(u.Path)
fmt.Println(u.Fragment)
// To get query params in a string of k=v format, use RawQuery.
// You can also parse query params into a map.
// The parsed query param maps are from strings to slices of strings,
// so index into [0] if you only want the first value.
fmt.Println(u.RawQuery)
m, _ := url.ParseQuery(u.RawQuery)
fmt.Println(m)
fmt.Println(m["k"][0])
fmt.Println("\n\n53.URL_Parsing.go-----------End------------")
// Running our URL parsing program shows all the different pieces that we extracted.
}
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