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    <p>Firstly,</p> <p><code>403 Forbidden</code> should be used when user is already authenticated but is not authorized to perform particular action. In your example <code>guest</code> is successfully authenticated but is not granted permission to see page because he is just a guest.</p> <p>You should use <code>401 Unauthorized</code> to indicate that your user was not authenticated successfully.</p> <p>More on HTTP errors codes: <a href="http://en.wikipedia.org/wiki/HTTP_401#4xx_Client_Error" rel="noreferrer">http://en.wikipedia.org/wiki/HTTP_401#4xx_Client_Error</a></p> <p>Secondly,</p> <p>you can specify your custom behavior by extending <code>BasicAuthenticationFilter</code>. There is <code>protected void onUnsuccessfulAuthentication(HttpServletRequest request, HttpServletResponse AuthenticationException failed)</code> method that you can override and do whatever is adequate. In default implementation that method is empty.</p> <p>Spring Security docs on injecting custom filter: <a href="http://static.springsource.org/spring-security/site/docs/3.1.x/reference/appendix-namespace.html#nsa-custom-filter" rel="noreferrer">CLICK</a></p> <p>Edit:</p> <p>What Spring Security does each time your authentication input is invalid:</p> <pre><code>public class BasicAuthenticationEntryPoint implements AuthenticationEntryPoint { ... public void commence(HttpServletRequest request, HttpServletResponse response, AuthenticationException authException) throws IOException, ServletException { response.addHeader("WWW-Authenticate", "Basic realm=\"" + realmName + "\""); response.sendError(HttpServletResponse.SC_UNAUTHORIZED, authException.getMessage()); </code></pre> <p>So, the default behavior is correct. User is sent 401 and is asked to provide valid login/credentials.</p> <p>Before overriding, try to understand the default behavior. Source code: <a href="https://github.com/SpringSource/spring-security/blob/master/web/src/main/java/org/springframework/security/web/authentication/www/BasicAuthenticationFilter.java" rel="noreferrer">CLICK</a></p>
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    1. USMaciej Ziarko
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    1. COThanks, Maciej. You're right, this is correct behavior after all. Good to know how to inject a custom filter though.
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