Graphiql UI Won't Fetch Schema When Service Connects To Mongo DB

[duffymo]

I asked a question on Stack Overflow a month back regarding a problem I'm having with Spring Boot grapnel starter version 1.0.0-M4, but there's been no response. I'm hoping to hear more from committers.

The graphiql UI can't fetch my schema when I connect to a service using Mongo DB as its backing data store:

Here is a shot of TCPMON showing the sequence of HTTP calls to the service when it fails:

It works perfectly if I replace the repository implementation with one that returns objects from a hard-coded in-memory collection of objects. Here is a screen shot of the graphiql interface:

Here is a shot of TCPMON showing the sequence of HTTP calls to the service when it succeeds:

The error message I see in the graphiql console is:

Failed to execute 'text' on 'Response': body stream is already read

Why does Mongo DB change the sequence of HTTP calls?

I've seen some suggestions to whitelist paths, but I don't know how to change my Spring configuration to do it.

I'd love any advice you can offer on how to address this.