added logs for oauth2 get clients method

@@ -19,11 +19,15 @@ import lombok.extern.slf4j.Slf4j;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.http.HttpStatus;
 import org.springframework.security.access.prepost.PreAuthorize;
-import org.springframework.web.bind.annotation.*;
+import org.springframework.web.bind.annotation.RequestBody;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RequestMethod;
+import org.springframework.web.bind.annotation.ResponseBody;
+import org.springframework.web.bind.annotation.ResponseStatus;
+import org.springframework.web.bind.annotation.RestController;
 import org.thingsboard.server.common.data.exception.ThingsboardException;
 import org.thingsboard.server.common.data.oauth2.OAuth2ClientInfo;
 import org.thingsboard.server.common.data.oauth2.OAuth2ClientsParams;
-import org.thingsboard.server.common.data.oauth2.SchemeType;
 import org.thingsboard.server.dao.oauth2.OAuth2Configuration;
 import org.thingsboard.server.queue.util.TbCoreComponent;
 import org.thingsboard.server.service.security.permission.Operation;
@@ -31,6 +35,7 @@ import org.thingsboard.server.service.security.permission.Resource;
 import org.thingsboard.server.utils.MiscUtils;
 
 import javax.servlet.http.HttpServletRequest;
+import java.util.Enumeration;
 import java.util.List;
 
 @RestController
@@ -46,6 +51,14 @@ public class OAuth2Controller extends BaseController {
     @ResponseBody
     public List<OAuth2ClientInfo> getOAuth2Clients(HttpServletRequest request) throws ThingsboardException {
         try {
+            if (log.isDebugEnabled()) {
+                log.debug("Executing getOAuth2Clients: [{}][{}][{}]", request.getScheme(), request.getServerName(), request.getServerPort());
+                Enumeration<String> headerNames = request.getHeaderNames();
+                while (headerNames.hasMoreElements()) {
+                    String header = headerNames.nextElement();
+                    log.debug("Header: {} {}", header, request.getHeader(header));
+                }
+            }
             return oAuth2Service.getOAuth2Clients(MiscUtils.getScheme(request), MiscUtils.getDomainNameAndPort(request));
         } catch (Exception e) {
             throw handleException(e);