fix: do not return status 200 on server info request when unreachable #343
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When proxying info requests to apm server we're loggin an error if the server is unreachable.
The ErrorHandler should also write a status code back to avoid returning a Status 200.
Add ModifyResponse to log a debug message with the body on unexpected responses and let the ErrorHandler proxy the status code back to the agent.
A StatusBadGateway is returned for generic errors.