All deployment URLs have two special pathnames:
/_src to a deployment URL or alias, the deployment inspector will be open and you'll be able to browse your deployment sources and build outputs.
/_logs to a deployment URL or alias, you will be able to see a realtime stream of logs from your deployment build processes and serverless invocations.
These pathnames redirect to
https://zeit.co and require logging in to access any sensitive information. A 3rd-party can never access your source or logs by crafting a deployment URL with one of these paths.