How to set Authorization Bearer token header

I am using JWT tokens for authentication and authorizaton process. I wish to set jwt token in "Authorization: Bearer <token> ".

w.Header().Add("Authorization", "Bearer "+TokenString)

I have used the above line to set my token in Authorization header in my response.

I need to use the token to access my other end points.

If I try to access the other end points using this header token. I cant able to do that. I am getting error as no authorization header.

This is my login function

func (c *Customer) Login(w http.ResponseWriter, r *http.Request) {
	
	if r.Method != "POST" {
		w.WriteHeader(http.StatusBadRequest)
		w.Write([]byte("Method mismatch"))
		return
	}
	customer := mappers.Decode(w, r)
	if customer == nil {
		w.WriteHeader(http.StatusInternalServerError)
		w.Write([]byte("Cannot able to parse"))
		return
	}

	err := c.customer.CusotmerLoginService(customer)
	if err != nil {
		w.WriteHeader(http.StatusBadRequest)
		w.Write([]byte("UNauthorised user or Register first"))
		fmt.Println(err)
		return
	}

	token, err := c.customer.GenerateToken(customer)
	if err != nil || token == "" {
		w.WriteHeader(http.StatusUnauthorized)
		w.Write([]byte("Cannot able to generate token"))
		return
	}
    w.Header().Add("Authorization", "Bearer "+TokenString)
	w.WriteHeader(http.StatusAccepted)
	w.Write([]byte("Logined successfully"))
	return
}

The following line is used to get the token from header

authHeader := r.Header.Get("Authorization")

If I use that line, I am getting error as no authorization header.

Try using Set function.

According to the documentation,
Add appends to any existing values associated with key, while Set sets the header entries associated with key to the single element value. It replaces any existing values associated with key.

req.Header.Set("Authorization", "Bearer "+jwtToken)

It seems like there might be a small mistake in your code. In the Login function, you are setting the token in the response header using w.Header().Add("Authorization", "Bearer "+TokenString), but you are not using the correct variable for the token. Instead, you should use token (the one you generated) instead of TokenString.

Here's the corrected version of your Login function:

func (c *Customer) Login(w http.ResponseWriter, r *http.Request) {
// ... Your existing code ...

token, err := c.customer.GenerateToken(customer)
if err != nil || token == "" {
    w.WriteHeader(http.StatusUnauthorized)
    w.Write([]byte("Cannot able to generate token"))
    return
}

// Use 'token' instead of 'TokenString' here
w.Header().Add("Authorization", "Bearer "+token)

w.WriteHeader(http.StatusAccepted)
w.Write([]byte("Logged in successfully"))
return
}