According to the official docs, the firebase_messaging plugin does not support handling data messages in the background. The messages are not handled and the data is 'lost'.

However it is not clear what happens to the message and whether it may affect privacy.
Also, this support is necessary.

Thanks

Google suggests enabling gzip compression before transferring files over the network:

In order to receive a gzip-encoded response you must do two things: Set an Accept-Encoding header, and modify your user agent to contain the string gzip. Here is an example of properly formed HTTP headers for enabling gzip compression:

Acc