Way to track sentry errors

[abonec]

There is no clear way to track internal sentry errors. I just spent 2 hours to find out why raven don't send any errors to our selfhosted instance.
Raven just silently ingest all my captures and do nothing. After debugging I find out that server sent me {"error":"Missing required attribute in authentication header: sentry_secret"}. After fix dsn url I got https error while Do request.

This errors was absolutely silent - I just debugged it from internals.

[kamilogorek]

I'll make sure to include this while working on https://github.com/getsentry/sentry-go/