authenticated http client requests from golang

Question

I have the following code:

client := &http.Client{}  /* Authenticate */ req, err := http.NewRequest("GET", "http://164.99.113.32/Authenticate", nil) req.SetBasicAuth("<username>","<password>") resp, err := client.Do(req) if err != nil {     fmt.Printf("Error : %s", err) }  /* Get Details */ req.URL, _ = url.Parse("http://164.99.113.32/Details") resp, err = client.Do(req) if err != nil {     fmt.Printf("Error : %s", err) } 

Now, the second http call is failing with a 401 access-denied error. A different REST client (a firefox plugin) correctly gets the details from the server, so I know that nothing is wrong on the server side. Do I need to pass some kind of session string or something that we got in the previous request ?

Answer 1

Okay. I have resolved this. I just needed to create a cookie jar.

I am surprised that this is not handled by default by the golang http req/client class.

The code that I had to use was:

type myjar struct {     jar map[string] []*http.Cookie }  func (p* myjar) SetCookies(u *url.URL, cookies []*http.Cookie) {     fmt.Printf("The URL is : %s\n", u.String())     fmt.Printf("The cookie being set is : %s\n", cookies)     p.jar [u.Host] = cookies }  func (p *myjar) Cookies(u *url.URL) []*http.Cookie {     fmt.Printf("The URL is : %s\n", u.String())     fmt.Printf("Cookie being returned is : %s\n", p.jar[u.Host])     return p.jar[u.Host] } 

and then in main:

    jar := &myjar{}     jar.jar = make(map[string] []*http.Cookie)     client.Jar = jar 

Works.

Answer 2

With HTTP Basic Authentication, the credentials are required for every request. Try copying the

req.SetBasicAuth("<username>", "<password>") 

line before the second client.Do(req).

The reason the Firefox plugin gets the details is that the browser will cache HTTP Basic Authentication tokens for subsequent use.