Send raw soap request with headers

LoginClient.java

    public boolean login(String userId, String password) {
        try {
            val content = soapMessageLoader.load("soap/login_message.xml", usernameOfCredential, passwordOfCredential, userId, password);
            log.info("Login content: {}", content);
            val soapConnectionFactory = SOAPConnectionFactory.newInstance();
            val endpoint = new URL(loginUrl);
            val connection = soapConnectionFactory.createConnection();
            val factory = MessageFactory.newInstance();
            val message = factory.createMessage(new MimeHeaders(), new ByteArrayInputStream(content.getBytes()));
            val response = connection.call(message, endpoint);
            try(val out = new ByteArrayOutputStream()) {
                response.writeTo(out);
                String res = out.toString();
                if (res != null && res.contains("Normal end")) {
                    return true;
                } else {
                    log.warn("Failed to login due to " + res);
                }
                return false;
            }
        } catch (SOAPException | IOException e) {
            log.error("Failed to login due to " + e.getMessage(), e);
        }
        return false;
    }