## Feature Request

I upgraded to the latest version and I started seeing this:

```
2022-04-10 15:04:41.691 | WARN | ResponseParser | Failed to parse JSON from upstream: Unrecognized token 'Request': was expecting (JSON String, Number, Array, Object or token 'null', 'true' or 'false')
at [Source: (byte[])"Request Blocked. Contact Flux Team."; line: 1, column: 9]
2022-04-10 15:04:41.702 | WARN | ResponseParser | Failed to parse JSON from upstream: Unexpected character ('<' (code 60)): expected a valid value (JSON String, Number, Array, Object or token 'null', 'true' or 'false')
at [Source: (byte[])"
405 Not Allowed

405 Not Allowed

"; line: 1, column: 2]
```

Obviously the error is coming from one of the configured upstreams but I don't know which one just by looking at the logs.

I can figure it out with some testing but it would be nice if the ResponseParser could tell us which one is throwing the error. Based on the output of the "State of ETH" messages I think it's reporting the upstream at `0` in this case.