diff --git a/spring-security/getting-started/SecureApplication/src/main/java/com/reflectoring/security/CustomHeaderValidatorFilter.java b/spring-security/getting-started/SecureApplication/src/main/java/com/reflectoring/security/CustomHeaderValidatorFilter.java
new file mode 100644
index 0000000..8df59d9
--- /dev/null
+++ b/spring-security/getting-started/SecureApplication/src/main/java/com/reflectoring/security/CustomHeaderValidatorFilter.java
@@ -0,0 +1,37 @@
+package com.reflectoring.security;
+
+import com.fasterxml.jackson.databind.ObjectMapper;
+import com.reflectoring.security.exception.CommonException;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.springframework.util.StringUtils;
+import org.springframework.web.filter.OncePerRequestFilter;
+
+import javax.servlet.FilterChain;
+import javax.servlet.ServletException;
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletResponse;
+import java.io.IOException;
+
+public class CustomHeaderValidatorFilter extends OncePerRequestFilter {
+
+    private static final Logger log = LoggerFactory.getLogger(CustomHeaderValidatorFilter.class);
+
+    @Override
+    protected boolean shouldNotFilter(HttpServletRequest request) throws ServletException {
+        String path = request.getRequestURI();
+        return path.startsWith("/library/books/all");
+    }
+
+    @Override
+    protected void doFilterInternal(HttpServletRequest request, HttpServletResponse response, FilterChain filterChain) throws ServletException, IOException {
+        log.info("Custom filter called...");
+        if (StringUtils.isEmpty(request.getHeader("X-Application-Name"))) {
+            response.setStatus(HttpServletResponse.SC_FORBIDDEN);
+            response.setContentType("application/json");
+            response.getOutputStream().println(new ObjectMapper().writeValueAsString(CommonException.headerError()));
+        } else {
+            filterChain.doFilter(request, response);
+        }
+    }
+}
diff --git a/spring-security/getting-started/SecureApplication/src/main/java/com/reflectoring/security/config/SecurityConfiguration.java b/spring-security/getting-started/SecureApplication/src/main/java/com/reflectoring/security/config/SecurityConfiguration.java
index 7d6a1d0..444d865 100644
--- a/spring-security/getting-started/SecureApplication/src/main/java/com/reflectoring/security/config/SecurityConfiguration.java
+++ b/spring-security/getting-started/SecureApplication/src/main/java/com/reflectoring/security/config/SecurityConfiguration.java
@@ -1,5 +1,6 @@
 package com.reflectoring.security.config;
 
+import com.reflectoring.security.CustomHeaderValidatorFilter;
 import com.reflectoring.security.exception.UserAuthenticationErrorHandler;
 import com.reflectoring.security.exception.UserForbiddenErrorHandler;
 import org.springframework.boot.context.properties.EnableConfigurationProperties;
@@ -15,6 +16,7 @@ import org.springframework.security.core.userdetails.UserDetailsService;
 import org.springframework.security.provisioning.InMemoryUserDetailsManager;
 import org.springframework.security.web.AuthenticationEntryPoint;
 import org.springframework.security.web.SecurityFilterChain;
+import org.springframework.security.web.authentication.www.BasicAuthenticationFilter;
 
 @Configuration
 @EnableWebSecurity
@@ -44,9 +46,16 @@ public class SecurityConfiguration {
                         .authenticationEntryPoint(userAuthenticationErrorHandler())
                         .accessDeniedHandler(new UserForbiddenErrorHandler()));
 
+        http.addFilterBefore(customHeaderValidatorFilter(), BasicAuthenticationFilter.class);
+
         return http.build();
     }
 
+    @Bean
+    public CustomHeaderValidatorFilter customHeaderValidatorFilter() {
+        return new CustomHeaderValidatorFilter();
+    }
+
     @Bean
     public WebSecurityCustomizer webSecurityCustomizer() {
         return (web) -> web.ignoring().antMatchers("/library/info");
diff --git a/spring-security/getting-started/SecureApplication/src/main/java/com/reflectoring/security/exception/CommonException.java b/spring-security/getting-started/SecureApplication/src/main/java/com/reflectoring/security/exception/CommonException.java
index e6aa3e1..a24fdfd 100644
--- a/spring-security/getting-started/SecureApplication/src/main/java/com/reflectoring/security/exception/CommonException.java
+++ b/spring-security/getting-started/SecureApplication/src/main/java/com/reflectoring/security/exception/CommonException.java
@@ -6,8 +6,7 @@ import org.zalando.problem.AbstractThrowableProblem;
 import org.zalando.problem.StatusType;
 
 import static com.fasterxml.jackson.annotation.JsonInclude.Include.NON_EMPTY;
-import static org.zalando.problem.Status.FORBIDDEN;
-import static org.zalando.problem.Status.UNAUTHORIZED;
+import static org.zalando.problem.Status.*;
 
 @JsonInclude(NON_EMPTY)
 @JsonIgnoreProperties({"stackTrace", "type", "title", "message", "localizedMessage", "parameters"})
@@ -25,5 +24,9 @@ public class CommonException extends AbstractThrowableProblem {
         return new CommonException(FORBIDDEN, "Forbidden");
     }
 
+    public static CommonException headerError() {
+        return new CommonException(FORBIDDEN, "Missing Header");
+    }
+
 
 }
diff --git a/spring-security/getting-started/SecureApplication/src/main/java/com/reflectoring/security/web/BookController.java b/spring-security/getting-started/SecureApplication/src/main/java/com/reflectoring/security/web/BookController.java
index e681b04..79f1922 100644
--- a/spring-security/getting-started/SecureApplication/src/main/java/com/reflectoring/security/web/BookController.java
+++ b/spring-security/getting-started/SecureApplication/src/main/java/com/reflectoring/security/web/BookController.java
@@ -42,4 +42,6 @@ public class BookController {
     public ResponseEntity<LibraryInfo> getInfo() {
         return ResponseEntity.ok().body(bookService.getLibraryInfo());
     }
+
+
 }