Not getting Location header from Golang http request - go

Question

I'm trying to port over something I had written in Node, the request looks like this in Node(JS):
function _initialConnection(user, pass, callback) {
let opts = {
url: config.loginURL,
headers: {
"User-Agent": "niantic"
}
};
request.get(opts, (err, resp, body) => {
if (err) return callback(err, null);
console.log(resp.headers);
let data;
try {
data = JSON.parse(body);
} catch(err) {
return callback(err, null);
}
return callback(null, user, pass, data);
});
}
function _postConnection(user, pass, data, callback) {
let opts = {
url: config.loginURL,
form: {
'lt': data.lt,
'execution': data.execution,
'_eventId': 'submit',
'username': user,
'password': pass
},
headers: {
'User-Agent': 'niantic'
}
};
request.post(opts, (err, resp, body) => {
if (err) return callback(err, null);
let parsedBody;
if (body) {
try {
parsedBody = JSON.parse(body)
if (('errors' in parsedBody) && parsedBody.errors.length > 0) {
return callback(
new Error('Error Logging In: ' + paredBody.errors[0]),
null
)
}
} catch(err) {
return callback(err, null);
}
}
console.log(resp.headers)
let ticket = resp.headers['location'].split('ticket=')[1];
callback(null, ticket);
});
}
If I console.log(resp.headers) I can see a location header.
I have tried to recreate this in Go the best way I could which I ended up with:
// Initiate HTTP Client / Cookie JAR
jar, err := cookiejar.New(nil)
if err != nil {
return "", fmt.Errorf("Failed to create new cookiejar for client")
}
newClient := &http.Client{Jar: jar, Timeout: 5 * time.Second}
// First Request
req, err := http.NewRequest("GET", loginURL, nil)
if err != nil {
return "", fmt.Errorf("Failed to authenticate with Google\n Details: \n\n Username: %s\n Password: %s\n AuthType: %s\n", details.Username, details.Password, details.AuthType)
}
req.Header.Set("User-Agent", "niantic")
resp, err := newClient.Do(req)
if err != nil {
return "", fmt.Errorf("Failed to send intial handshake: %v", err)
}
respJSON := make(map[string]string)
err = json.NewDecoder(resp.Body).Decode(&respJSON)
if err != nil {
return "", fmt.Errorf("Failed to decode JSON Body: %v", err)
}
resp.Body.Close()
// Second Request
form := url.Values{}
form.Add("lt", respJSON["lt"])
form.Add("execution", respJSON["execution"])
form.Add("_eventId", "submit")
form.Add("username", details.Username)
form.Add("password", details.Password)
req, err = http.NewRequest("POST", loginURL, strings.NewReader(form.Encode()))
if err != nil {
return "", fmt.Errorf("Failed to send second request authing with PTC: %v", err)
}
req.Header.Set("User-Agent", "niantic")
req.Header.Set("Content-Type", "application/x-www-form-urlencoded")
resp, err = newClient.Do(req)
if err != nil {
return "", fmt.Errorf("Failed to send second request authing with PTC: %v", err)
}
log.Println(resp.Location())
ticket := resp.Header.Get("Location")
if strings.Contains(ticket, "ticket") {
ticket = strings.Split(ticket, "ticket=")[1]
} else {
return "", fmt.Errorf("Failed could not get the Ticket from the second request\n")
}
resp.Body.Close()
But when I log.Println(resp.Location()) I get <nil>
I'm really not sure what the differences are here (I've tried with and without the Content-Type header but for some reason I just can NOT get the Location header that I'm looking for.
I really can't see a discrepancy between the Node request, vs the Go request but any help would be great as I have been beating my head off the wall for the last day. Thanks.

Answer 1

You can get that url by checking resp.Request.URL after the resp, err = newClient.Do(req). There isn't a really simple way to ignore redirects, you can do a manual call through a http.RoundTripper, or you can set a CheckRedirect function on the client, but it's not ideal.