Example:
You have link <a href="about">about us</a> that indicate your browser will redirect to "http://localhost/about".
But if our position is on "http://localhost/certainhost/gallery/image/", when you click the link, the address will became "http://localhost/certainhost/gallery/image/about".
From this example we can make a conclusion that this is not right and the solution is we need function that work as base_url() that give us the base url (http://localhost).
Now we know the problem and the solution. But, how?
How to use base url at Spring Boot?
The answer is easy, just type this code <a th:href="@{/about}"></a>
We need to add "th:" as declare that this is a thymeleaf code and add "@{}" as this link is base url