Issue decoding JWT access token

[maurerbot]

The specific issue seems to be here...

parts := strings.Split(jwt, ".")
    header := parts[0]
    header = padHeader(header)
    headerDecoded, err := base64.StdEncoding.DecodeString(header)

    if err != nil {
        return false, fmt.Errorf("the tokens header does not appear to be a base64 encoded string")
    }

The token header is throwing illegal base64 data at input byte 88 but the header decodes fine on jsonwebtoken.io.

This is an example header:
eyJraWQiOiJmVzlaZXM2SHp2My05RTg3Wnl5RnFWN0t4amJUdlVRNWZzdWxZWDNpa1hJIiwiYWxnIjoiUlMyNTYifQ

Full details on this issue on here.

[maurerbot]

issue fixed. see stackoverflow