Apollo Server 2.0 RC sends only one (error) response for unknown Batched Automatic Persisted Queries

[molzahn-sio]

Hello everyone,

we're currently trying to get batched queries (apollo-link-batch-http) to work with automatic persisted queries (apollo-link-persisted-queries) and apollo server 2.0 RC.

Our Apollo Client application is sending initially two batched requests:

[
   {
      "operationName":"LoadGeneralStatus",
      "variables":{ },
      "extensions":{
         "persistedQuery":{
            "version":1,
            "sha256Hash":"b662f1ccb162a654e1f8df1cfb43828d803bec9a24507fa0ad389dbefd7a3f99"
         }
      }
   },   {
      "operationName":"LoadControlUnits",
      "variables":{ },
      "extensions":{
         "persistedQuery":{
            "version":1,
            "sha256Hash":"393176e6a858d120f786901a6ab8fd4e1616165f14d176c8cb0a908a331e05fe"
         }
      }
   }
]

The server response is as follows:

{
   "errors":[
      {
         "message":"PersistedQueryNotFound",
         "extensions":{
            "code":"PERSISTED_QUERY_NOT_FOUND",
            "exception":{
               "stacktrace":[
                  "PersistedQueryNotFoundError: PersistedQueryNotFound",
                  "    at Object.<anonymous> (C:\\Test\\Server\\node_modules\\apollo-server-core\\src\\runHttpQuery.ts:189:16)",
                  "    at Generator.next (<anonymous>)",
                  "    at fulfilled (C:\\Test\\Server\\node_modules\\apollo-server-core\\dist\\runHttpQuery.js:4:58)",
                  "    at <anonymous>",
                  "    at process._tickDomainCallback (internal/process/next_tick.js:228:7)"
               ]
            }
         }
      }
   ]
}

Please note that there is only one response although two batched requests have been made.

Within a Query-component of React Apollo we now receive an error:

 Error: server returned results with length 1, expected length of 2
     at Object.next (webpack-internal:///./node_modules/apollo-link-batch/lib/batching.js:98:33)
     at notifySubscription (webpack-internal:///./node_modules/zen-observable/lib/Observable.js:126:18)
     at onNotify (webpack-internal:///./node_modules/zen-observable/lib/Observable.js:161:3)
     at SubscriptionObserver.next (webpack-internal:///./node_modules/zen-observable/lib/Observable.js:215:7)
     at eval (webpack-internal:///./node_modules/apollo-link-batch-http/lib/batchHttpLink.js:97:30)

I'm not completely certain, but I assume this is related to only receiving one response.

Expected behavior (as far as I understand it)

1. Batched request with two persisted parts is beingt sent
2. Server doesn't know about both and responds with two batched "PersistedQueryNotFound" messages
3. Client resends the proper expanded query
4. UI updates silently without any network errors

Note: this might somewhat be related to #941 ?

[evans]

@Ralmo Thank you for flagging the issue! It's definitely an bug. If you have a breaking test case, I'd love to incorporate it into the testsuite and make sure we can fix it for the next release

[molzahn-sio]

@evans: glad to help. I don't have any tests into that direction, though, as I'm only just beginning to get comfortable with those advanced graphql features.

[evans]

This was fixed in rc.3 🎉

[molzahn-sio]

@evans : Great, thank you very much! I can confirm that it does work as expected now.