diff --git a/cvat/apps/engine/log.py b/cvat/apps/engine/log.py
index 4b065bfc6c3..d54e161a73c 100644
--- a/cvat/apps/engine/log.py
+++ b/cvat/apps/engine/log.py
@@ -90,7 +90,8 @@ class dotdict(dict):
 
 clogger = dotdict({
     'task': TaskClientLoggerStorage(),
-    'job': JobClientLoggerStorage()
+    'job': JobClientLoggerStorage(),
+    'glob': logging.getLogger('cvat.client'),
 })
 
 slogger = dotdict({
diff --git a/cvat/apps/engine/serializers.py b/cvat/apps/engine/serializers.py
index be512bea4fd..86cdb5c2b97 100644
--- a/cvat/apps/engine/serializers.py
+++ b/cvat/apps/engine/serializers.py
@@ -9,16 +9,25 @@ class Meta:
             'bug_tracker', 'created_date', 'updated_date', 'overlap',
             'z_order', 'flipped', 'source', 'status')
 
-class GroupSerializer(serializers.ModelSerializer):
-    class Meta:
-        model = Group
-        fields = ('name',)
-
 class UserSerializer(serializers.ModelSerializer):
-    groups = GroupSerializer(many=True)
+    groups = serializers.SlugRelatedField(many=True,
+        slug_field='name', queryset=Group.objects.all())
 
     class Meta:
         model = User
-        fields = ('id', 'first_name', 'last_name', 'email', 'is_staff',
-            'is_superuser', 'is_active', 'groups')
-        write_only_fields = ('password', 'date_joined')
+        fields = ('id', 'username', 'first_name', 'last_name', 'email',
+            'groups', 'is_staff', 'is_superuser', 'is_active', 'last_login',
+            'date_joined', 'groups')
+        read_only_fields = ('last_login', 'date_joined')
+        write_only_fields = ('password', )
+
+class ExceptionSerializer(serializers.Serializer):
+    task = serializers.IntegerField()
+    job = serializers.IntegerField()
+    message = serializers.CharField(max_length=1000)
+    filename = serializers.URLField()
+    line = serializers.IntegerField()
+    column = serializers.IntegerField()
+    stack = serializers.CharField(max_length=10000)
+    browser = serializers.CharField(max_length=255)
+    os = serializers.CharField(max_length=255)
diff --git a/cvat/apps/engine/urls.py b/cvat/apps/engine/urls.py
index 42b13bf9acc..21e36d48b26 100644
--- a/cvat/apps/engine/urls.py
+++ b/cvat/apps/engine/urls.py
@@ -9,10 +9,29 @@
 REST_API_PREFIX = 'api/<version>/'
 
 urlpatterns = [
-    path( # entry point for API
-        REST_API_PREFIX,
-        views.api_root,
-        name='root'),
+    # entry point for API
+    path(REST_API_PREFIX, views.api_root, name='root'),
+    # GET current active user
+    path(REST_API_PREFIX + 'users/self', views.UserSelf.as_view(),
+        name='user-self'),
+    # GET list of users, POST a new user
+    path(REST_API_PREFIX + 'users/', views.UserList.as_view(),
+        name='user-list'),
+    # GET, DELETE, PATCH the user
+    path(REST_API_PREFIX + 'users/<int:pk>', views.UserDetail.as_view(),
+        name='user-detail'),
+    # GET a frame for a specific task
+    path(REST_API_PREFIX + 'tasks/<int:pk>/frames/<int:frame>',
+        views.get_frame, name='task-frame'),
+    # POST an exception
+    path(REST_API_PREFIX + 'exceptions/', views.ClientException.as_view(),
+        name='exception-list'),
+
+
+    # GET information about the backend
+    path(REST_API_PREFIX + 'info/', views.dummy_view, name='server-info'),
+
+
     path( # GET, POST
         REST_API_PREFIX + 'tasks/',
         views.TaskList.as_view(),
@@ -21,10 +40,6 @@
         REST_API_PREFIX + 'tasks/<int:pk>',
         views.TaskDetail.as_view(),
         name='task-detail'),
-    path( # GET
-        REST_API_PREFIX + 'tasks/<int:pk>/frames/<int:frame>',
-        views.dummy_view,
-        name='task-frame'),
     path( # GET
         REST_API_PREFIX + 'tasks/<int:pk>/jobs/',
         views.dummy_view,
@@ -41,26 +56,6 @@
         REST_API_PREFIX + 'jobs/<int:pk>/annotations/',
         views.dummy_view,
         name='job-annotations'),
-    path( # GET
-        REST_API_PREFIX + 'users/',
-        views.UserList.as_view(),
-        name='user-list'),
-    path( # GET, DELETE, PATCH
-        REST_API_PREFIX + 'users/<int:pk>',
-        views.UserDetail.as_view(),
-        name='user-detail'),
-    path( # GET
-        REST_API_PREFIX + 'users/myself',
-        views.dummy_view,
-        name='user-myself'),
-    path( # POST
-        REST_API_PREFIX + 'exceptions/',
-        views.dummy_view,
-        name='exception-list'),
-    path( # GET
-        REST_API_PREFIX + 'info/',
-        views.dummy_view,
-        name='server-info'),
     path( # GET
         REST_API_PREFIX + 'plugins/',
         views.dummy_view,
@@ -87,7 +82,7 @@
         name='plugin-request-detail'),
 
     path('create/task', views.create_task), ####
-    path('get/task/<int:tid>/frame/<int:frame>', views.get_frame), ###
+    path('get/task/<int:pk>/frame/<int:frame>', views.get_frame), ###
     path('check/task/<int:tid>', views.check_task), ####
     path('delete/task/<int:tid>', views.delete_task), ####
     path('update/task/<int:tid>', views.update_task), ####
diff --git a/cvat/apps/engine/views.py b/cvat/apps/engine/views.py
index 1a4133a985b..a2a6ccf9862 100644
--- a/cvat/apps/engine/views.py
+++ b/cvat/apps/engine/views.py
@@ -17,6 +17,8 @@
 from rest_framework.decorators import api_view, APIView
 from rest_framework.response import Response
 from rest_framework.reverse import reverse
+from rest_framework.renderers import JSONRenderer
+
 
 
 from . import annotation, task, models
@@ -26,7 +28,8 @@
 import logging
 from .log import slogger, clogger
 from cvat.apps.engine.models import StatusChoice, Task
-from cvat.apps.engine.serializers import TaskSerializer, UserSerializer
+from cvat.apps.engine.serializers import TaskSerializer, UserSerializer,\
+   ExceptionSerializer
 from django.contrib.auth.models import User
 
 # Server REST API
@@ -37,7 +40,7 @@ def api_root(request, version=None):
     return Response({
         'tasks': reverse('task-list', request=request),
         'users': reverse('user-list', request=request),
-        'myself': reverse('user-myself', request=request),
+        'myself': reverse('user-self', request=request),
         'exceptions': reverse('exception-list', request=request),
         'info': reverse('server-info', request=request),
         'plugins': reverse('plugin-list', request=request)
@@ -48,28 +51,75 @@ class TaskList(generics.ListCreateAPIView):
     queryset = Task.objects.all()
     serializer_class = TaskSerializer
 
+
 class TaskDetail(generics.RetrieveUpdateDestroyAPIView):
     queryset = Task.objects.all()
     serializer_class = TaskSerializer
 
+
 class UserList(generics.ListCreateAPIView):
     queryset = User.objects.all()
     serializer_class = UserSerializer
 
+
 class UserDetail(generics.RetrieveUpdateDestroyAPIView):
     queryset = User.objects.all()
     serializer_class = UserSerializer
 
+
+class UserSelf(generics.RetrieveAPIView):
+    serializer_class = UserSerializer
+
+    def get_object(self):
+        return self.request.user
+
+
+@login_required
+@permission_required(perm=['engine.task.access'],
+                     fn=objectgetter(models.Task, 'pk'), raise_exception=True)
+def get_frame(request, pk, frame, version=None):
+    """Stream corresponding from for the task"""
+
+    try:
+        # Follow symbol links if the frame is a link on a real image otherwise
+        # mimetype detection inside sendfile will work incorrectly.
+        path = os.path.realpath(task.get_frame_path(pk, frame))
+        return sendfile(request, path)
+    except Exception as e:
+        slogger.task[pk].error(
+            "cannot get frame #{}".format(frame), exc_info=True)
+        return HttpResponseBadRequest(str(e))
+
+
+class ClientException(APIView):
+    def post(self, request):
+        serializer = ExceptionSerializer(data=request.data)
+        if serializer.is_valid(raise_exception=True):
+            message = JSONRenderer().render(serializer.data)
+            jid = serializer.data["job"]
+            tid = serializer.data["task"]
+            if jid:
+                clogger.job[jid].error(message)
+            elif tid:
+                clogger.task[tid].error(message)
+            else:
+                clogger.glob.error(message)
+
+            return Response(serializer.data, status=status.HTTP_201_CREATED)
+
+
 @api_view(['GET'])
 def dummy_view(request, version=None, pk=None, frame=None, id=None, name=None):
     return Response()
 
+
+# XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
 # High Level server API
 
 
 @login_required
 @permission_required(perm=['engine.job.access'],
-    fn=objectgetter(models.Job, 'jid'), raise_exception=True)
+                     fn=objectgetter(models.Job, 'jid'), raise_exception=True)
 def catch_client_exception(request, jid):
     data = json.loads(request.body.decode('utf-8'))
     for event in data['exceptions']:
@@ -169,23 +219,6 @@ def check_task(request, tid):
     return JsonResponse(response)
 
 
-@login_required
-@permission_required(perm=['engine.task.access'],
-                     fn=objectgetter(models.Task, 'tid'), raise_exception=True)
-def get_frame(request, tid, frame):
-    """Stream corresponding from for the task"""
-
-    try:
-        # Follow symbol links if the frame is a link on a real image otherwise
-        # mimetype detection inside sendfile will work incorrectly.
-        path = os.path.realpath(task.get_frame_path(tid, frame))
-        return sendfile(request, path)
-    except Exception as e:
-        slogger.task[tid].error(
-            "cannot get frame #{}".format(frame), exc_info=True)
-        return HttpResponseBadRequest(str(e))
-
-
 @login_required
 @permission_required(perm=['engine.task.delete'],
                      fn=objectgetter(models.Task, 'tid'), raise_exception=True)