Do you want to know what your phone is sending & receiving? Nowadays, that means you need to control who it trusts. In modern connections everything sent & received is encrypted by TLS, and the only practical way to intercept traffic on Android is to generate a certificate, make the phone or app trust it as a certificate authority (CA), and then use this to act as a fully trusted proxy to the real server.
Android 17 enables certificate transparency, and breaks custom CAs
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September 23, 2026
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http-toolkit