Send error body from environment controller

We are using spring-cloud-config-client-2.0.0.RELEASE.

In case of config branch not available then config server fails with following message which is not enough to pin point the exact problem:

o.s.c.c.c.ConfigServicePropertySourceLocator - Fetching config from server at: http://my-config-server:8888
ERROR [] o.s.boot.SpringApplication - Application startup failedjava.lang.IllegalStateException: Could not locate PropertySource and the fail fast property is set, failing

The above message seems to be coming from following line of ConfigServicePropertySourceLocator

if (properties.isFailFast()) {
throw new IllegalStateException(
"Could not locate PropertySource and the fail fast property is set, failing" +
(errorBody == null ? "" : ": " + errorBody), error);
}

This could come due to many reasons but in the case of branch not found it should at least log absolute branch URL or give branch not found.

Suggestions are welcome or if I miss anything. My Microservice which is utilizing config server is using spring boot fail fast.

Start at ConfigServicePropertySourceLocator and the fail-fast error path shown in the issue. Reproduce a missing config branch and inspect the available error body; done means the startup failure identifies the branch-not-found cause or includes the relevant branch URL.