I am using a FeignClient and a GetMapping to interact with an external system.  

My GetMapping is defined as:

```
   @GetMapping(value = "/path/to/endpoint?fields=[\"nm\",\"label\"]")
   public String hitEndpoint() {}

```

Debug shows that the endpoint is being called with:

```
https://url/path/to/endpoint?fields=[%22nm%22&fields=%22label%22]

```

Which is failing because the endpoint expects valid json for the fields parameter:

```
https://url/path/to/endpoint?fields=[%22nm%22,%22label%22]

```

How do I convince GetMapping to make the request correctly?

Thanks for any help.