Weird characters on Playground since last release

[ooga]

Describe the bug
Weird characters on Playground since release 8.1.0, looks like a charset issue.
Everything is working fine with version 8.0.0

To Reproduce
Steps to reproduce the behavior:

1. Use com.graphql-java-kickstart:playground-spring-boot-starter:8.1.0

[oliemansm]

Playground has been upgraded to 1.7.26 in release 8.1.0. Could you try with an earlier version of playground by enabling CDN to see if that "solves" the problem? That way we'll know if it's something in that release of Playground or if it's something else.

graphql.playground:
    cdn:
        enabled: true
        version: "1.7.20"

[ooga]

Enabling cdn solves the problem 👍
It even works well with version: "1.7.26"

[oliemansm]

Ok, so it has something to do with the static version hosted along with the code, but not with this specific Playground version. That helps in finding the cause. Thanks for confirming 👍🏻

[BlasiusSecundus]

I could not reproduce, but I ran into the same issue while working on Playground for WebFlux (#487), strangely only affecting the webflux version.

For that, the simple fix in this commit did the trick. @ooga , could you please try?

(Update: with the webflux version, I could also reproduce the phenomenon that it works if the files are loaded from CDN.)

[ooga]

I confirm the commit fix the issue 👍