add chunk error handler

Author: StekPerepolnen

ydb/core/mon/mon.cpp

@@ -1204,8 +1204,17 @@ class THttpMonAuthorizedActorRequest : public TActorBootstrapped<THttpMonAuthori
     }
 
     void Handle(NHttp::TEvHttpProxy::TEvHttpOutgoingDataChunk::TPtr& ev) {
-        Send(Event->Sender, new NHttp::TEvHttpProxy::TEvHttpOutgoingDataChunk(ev->Get()->DataChunk), 0, Event->Cookie);
-        if (ev->Get()->DataChunk && ev->Get()->DataChunk->IsEndOfData()) {
+        bool endOfData = false;
+        if (ev->Get()->DataChunk) {
+            Send(Event->Sender, new NHttp::TEvHttpProxy::TEvHttpOutgoingDataChunk(ev->Get()->DataChunk), 0, Event->Cookie);
+            if (ev->Get()->DataChunk->IsEndOfData()) {
+                endOfData = true;
+            }
+        } else if (ev->Get()->Error) {
+            Send(Event->Sender, new NHttp::TEvHttpProxy::TEvHttpOutgoingDataChunk(ev->Get()->Error), 0, Event->Cookie);
+            endOfData = true;
+        }
+        if (endOfData) {
             PassAway();
         }
     }
@@ -1225,7 +1234,7 @@ class THttpMonAuthorizedActorRequest : public TActorBootstrapped<THttpMonAuthori
             hFunc(NHttp::TEvHttpProxy::TEvHttpOutgoingResponse, Handle);
             hFunc(NHttp::TEvHttpProxy::TEvHttpOutgoingDataChunk, Handle);
             hFunc(NHttp::TEvHttpProxy::TEvSubscribeForCancel, Handle);
-            hFunc(NHttp::TEvHttpProxy::TEvRequestCancelled, Handle)
+            hFunc(NHttp::TEvHttpProxy::TEvRequestCancelled, Handle);
         }
     }
 };