How to Manage Cookies for Authenticated HTTP Client Requests in Go?

Authenticated HTTP Client Requests from Go

In the context of making HTTP client requests that require authentication, a common issue arises when subsequent requests fail with a 401 access-denied error. Let's explore a Golang solution to this problem.

In the provided code snippet, the client successfully authenticates with the server using HTTP Basic Authentication but faces challenges in the subsequent request to retrieve user details. To address this, the solution lies in creating a custom cookie jar.

Golang's HTTP client does not automatically handle cookie management. A cookie jar is necessary to store and manage cookies across HTTP requests. The code below defines a custom cookie jar implementation:

type myjar struct {
    jar map[string] []*http.Cookie
}

func (p* myjar) SetCookies(u *url.URL, cookies []*http.Cookie) {
    p.jar [u.Host] = cookies
}

func (p *myjar) Cookies(u *url.URL) []*http.Cookie {
    return p.jar[u.Host]
}

In the main function, we initialize the custom cookie jar and assign it to the client's Jar field:

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

By incorporating these changes, Golang can successfully manage cookies across authenticated HTTP requests. Now, the client will automatically attach the cookie associated with the authenticated session to subsequent requests, ensuring that the Details request is processed correctly without the 401 error.

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