Refactor exception handling and remove unused dependencies

pom.xml

@@ -58,21 +58,6 @@
             <scope>test</scope>
         </dependency>
 
-        <dependency>
-            <groupId>io.jsonwebtoken</groupId>
-            <artifactId>jjwt-api</artifactId>
-            <version>0.11.5</version>
-        </dependency>
-        <dependency>
-            <groupId>io.jsonwebtoken</groupId>
-            <artifactId>jjwt-impl</artifactId>
-            <version>0.11.5</version>
-        </dependency>
-        <dependency>
-            <groupId>io.jsonwebtoken</groupId>
-            <artifactId>jjwt-jackson</artifactId>
-            <version>0.11.5</version>
-        </dependency>
         <dependency>
             <groupId>org.projectlombok</groupId>
             <artifactId>lombok</artifactId>

src/main/java/com/ms/gatewayserver/exception/GlobalExceptionHandler.java

@@ -1,24 +1,24 @@
 package com.ms.gatewayserver.exception;
 
 import com.ms.gatewayserver.util.ErrorDetails;
-import org.springframework.http.HttpStatus;
 import org.springframework.http.ResponseEntity;
 import org.springframework.web.bind.annotation.ControllerAdvice;
 import org.springframework.web.bind.annotation.ExceptionHandler;
+import org.springframework.web.server.ResponseStatusException;
 import org.springframework.web.server.ServerWebExchange;
 
 import java.util.Date;
 
 @ControllerAdvice
 public class GlobalExceptionHandler {
 
-    @ExceptionHandler(Exception.class)
-    public ResponseEntity<ErrorDetails> globalExceptionHandler(Exception ex, ServerWebExchange exchange) {
+    @ExceptionHandler(ResponseStatusException.class)
+    public ResponseEntity<ErrorDetails> responseStatusExceptionHandler(ResponseStatusException ex, ServerWebExchange exchange) {
         ErrorDetails errorDetails = new ErrorDetails(
                 new Date(),
                 ex.getMessage(),
                 exchange.getRequest().getPath().value()
         );
-        return new ResponseEntity<>(errorDetails, HttpStatus.UNAUTHORIZED);
+        return new ResponseEntity<>(errorDetails, ex.getStatusCode());
     }
 }

src/main/java/com/ms/gatewayserver/external/identity/IIdentityFeignClient.java

@@ -1,9 +1,7 @@
 package com.ms.gatewayserver.external.identity;
 
 import com.ms.gatewayserver.external.identity.models.TokenRequest;
-import com.ms.gatewayserver.external.identity.models.VerificationResult;
 import org.springframework.cloud.openfeign.FeignClient;
-import org.springframework.web.bind.annotation.PostMapping;
 import org.springframework.web.bind.annotation.RequestBody;
 import org.springframework.web.bind.annotation.RequestMapping;
 import org.springframework.web.bind.annotation.RequestMethod;