Arti 2.4 released with stable flow & congestion controls, TorClient API changes, and more

Arti 2.4 is now available, marking the latest milestone in the ongoing effort to build a next-generation Tor implementation in Rust. This release delivers several impactful updates for developers and privacy-focused users.

Notably, flow control and congestion control have progressed to a stable status. These networking features can be activated by compiling Arti with the flowctl-cc flag, enhancing performance and reliability. Alongside this, Arti 2.4 continues development work necessary for running Arti as both a Tor relay and a directory authority, key components of the broader Tor network architecture. The update also resolves various bugs affecting connectivity for onion service clients, addressing issues relevant to secure service access.

For developers using the arti-client crate, this release brings several breaking changes to the TorClient APIs. One significant adjustment is the removal of the use_obsolete_software option, so codebases may require updates to maintain compatibility. In addition to these core changes, Arti 2.4 includes a range of bug fixes, internal codebase cleanups, and improvements to the project's continuous integration workflows.