I have the following code ```object HelloWorldQueryHandler f

Question

I have the following code ```object HelloWorldQueryHandler fun hello yourname String = Hello $yourname class GraphQLHandler GraphQLHandler private val graphql = newGraphQL toSchema SchemaGeneratorConfig supportedPackages = listOf no example capgemini listOf TopLevelObject HelloWorldQueryHandler build override fun invoke request GraphQLRequest GraphQLResponse = GraphQLResponse from graphql execute Builder query request query variables request variables fun main val app = routes graphql bind graphQL GraphQLHandler app asServer Netty start ``` Now this works when I use the GraphQL playground but not when I use the Graphiql client For the Graphiql client this just returns an empty response Am I missing something Why is there a difference

dave · Answer

suggest that you put a debugging filter on the handler `handler debug ` and sniff what the difference in request is

Arnab · Answer

< dave> where exactly do you mean I don t quite understand where the `handler` object is open mouth

dave · Answer

```app debug asServer Netty start ```

Arnab · Answer

``` REQUEST POST graphql POST graphql HTTP 1 1 Host localhost 8000 Connection keep alive accept Origin null User Agent Mozilla 5 0 Macintosh Intel Mac OS X 10 16 0 AppleWebKit 537 36 KHTML like Gecko GraphQLPlayground 1 8 10 Chrome 61 0 3163 100 Electron 2 0 11 Safari 537 36 content type application json Accept Encoding gzip deflate Accept Language en GB content length 84 lt lt stream gt gt RESPONSE 200 to POST graphql HTTP 1 1 200 OK content type application json charset=utf 8 data hello Hello arnab errors null REQUEST POST graphql POST graphql HTTP 1 1 Content Type application json User Agent graphiql app Host localhost 8000 Connection close content length 65 lt lt stream gt gt RESPONSE 400 to POST graphql HTTP 1 1 400 Bad Request```

Arnab · Answer

What in the world

dave · Answer

put `debug debugStreams=true ` instead you ll get the content of the request

Arnab · Answer

So this ` query n hello yourname Arnab n variables null ` gives 400 but this does not ` operationName null variables query n hello yourname arnab n n ` I am really not sure what s going on here The first one is from Graphiql and the other from GraphQL playground

Arnab · Answer

In my eyes both are identical except playground sends an empty dict for variables and null for operation name

Arnab · Answer

Apparently sending an empty dict in GraphiQL is the thing open mouth This is really strange

dave · Answer

I think the problem is that at the moment the vraiables can t be null ```data class GraphQLRequest val query String = val operationName String = null val variables Map lt String Any gt = emptyMap companion object val requestLens = Body auto lt GraphQLRequest gt toLens ```

dave · Answer

interestingly the graphql java lib will blow up if it is null ``` this variables = assertNotNull variables gt variables map can t be null ```

dave · Answer

we can easily fix it but I m not sure what the actual spec says about if the fields are nullable

Arnab · Answer

Well I took a look at the specs and as far as I can see here variables are not required in a query Nullability I cannot say anything about however What I can say however is that apollo graphql for instance has nullable variables

dave · Answer

no problem we can fix it to not blow up in the absence of variables

Arnab · Answer

Where is this code from ```this variables = assertNotNull variables gt variables map can t be null ```

Arnab · Answer

the snippet you posted above

dave · Answer

that s from graphql java library

Arnab · Answer

This is interesting I ll take a look as to how ktor solves this for instance

dave · Answer

well it s just a matter of making the field nullable and passing in an empty map instead it s already fixed

Arnab · Answer

Oh ok is the release already out

dave · Answer

not yet

dave · Answer

it s out now slightly smiling face