The GrapheneOS proxies are different depending on connection.
Some just pass an encrypted blob onward to Google, others can actually see the contents of the request, others are just downloading a static file with no information from client.
- connectivity check is just a static request/response from their server
- the time request piggy backs on the connectivity check requests
- the remote provisioning proxy passes an encrypted payload to/from Google
- the psds proxy just proxies static files from broadcom/samsung/qualcomm
- the vanadium proxy just proxies static files from google
- the supl proxy however can let them see the contents of the supl request