Pull info from private site that requires login (Golang)

I am trying to pull my classes from my online timetable, however, it seems as if I cannot get past the login stage. My code is:

package main
import (
"fmt"
"io/ioutil"
"log"
"net/http"
"net/url"
"strings"
"github.com/PuerkitoBio/goquery"
)
type App struct {
Client *http.Client
}
type Timetable struct {
Name string
}
const (
baseURL string = "https://myclasswebsite.com"
)
func (app *App) login() {
//login := loginInfo()
client := app.Client
loginURL := baseURL + "/portal2/#!/login"
data := url.Values{
"inputEmail": {"my_actual_username"},
"password":   {"my_actual_password"},
}
response, err := client.PostForm(loginURL, data)
if err != nil {
log.Fatalln(err)
}
defer response.Body.Close()
_, err = ioutil.ReadAll(response.Body)
if err != nil {
log.Fatalln(err)
}
}
func (app *App) getTimetable() []Timetable {
timetableURL := baseURL + "/portal/dashboard"
client := app.Client
response, err := client.Get(timetableURL)
if err != nil {
log.Fatalln("Error fetching response. ", err)
}
defer response.Body.Close()
document, err := goquery.NewDocumentFromReader(response.Body)
fmt.Println(document.Html())
if err != nil {
log.Fatal("Error loading HTTP response body. ", err)
}
var classes []Timetable
document.Find(".timetable table").Each(func(i int, s *goquery.Selection) {
className := strings.TrimSpace(s.Text())
class := Timetable{
Name: className,
}
classes = append(classes, class)
})
return classes
}

I changed the base URL and login info just for privacy reasons, however, the rest of the code is as-is.

My main. go file is:

package main
import (
"fmt"
"net/http"
"net/http/cookiejar"
)
func main() {
jar, _ := cookiejar.New(nil)
app := App{
Client: &http.Client{Jar: jar},
}
app.login()
classes := app.getTimetable()
fmt.Println("class array is", classes)
for index, class := range classes {
fmt.Printf("%d: %s\n", index+1, class.Name)
}
}

The final print returns an empty slice, and when I print the response.Html() to the console, I receive the login-page Html rather than the dashboard-page HTML.

I'm in no way expecting anyone to fix this for me but a second pair of eyes and maybe a clue in which direction I should go would be helpful. Thank you so much!

Since I'm unfamiliar with your class website, some ideas for progressing:

You're not checking the status code from your login call. You may be getting a non-200 status code.

After you've confirmed the status code, check the cookie jar to ensure that a cookie has been saved. This is probably on the unlikelier side, but it's worth checking.

Lastly, attempt the same sequence with curl with -v (if you haven't already). That will give you more insight as to what is happening with your call plan.

I ended up ignoring some cookies accidentally while testing. Whoops...