java-tutorials/httpclient-simple/src/main/java/com/baeldung/security/RestAuthenticationEntryPoint.java

package com.baeldung.security;

import java.io.IOException;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.springframework.security.core.AuthenticationException;
import org.springframework.security.web.AuthenticationEntryPoint;
import org.springframework.stereotype.Component;

/**
 * The Entry Point will not redirect to any sort of Login - it will return the 401
 */
@Component
public final class RestAuthenticationEntryPoint implements AuthenticationEntryPoint {

    @Override
    public void commence(final HttpServletRequest request, final HttpServletResponse response, final AuthenticationException authException) throws IOException {
        response.sendError(HttpServletResponse.SC_UNAUTHORIZED, "Unauthorized");
    }

}