Crate features / h2
Feature flags · h2 0.4.20 · from crates.io 2026-10-24
h2 features: what each one does, and the line to copy
Short answerh2 0.4.20 has 2 features. Nothing is on by default: turn on what you use. It needs Rust 1.63 or newer.
Pick features
Every feature
| Feature | In default | Turns on |
|---|---|---|
stream | nothing else (a switch the code checks) | |
unstable | nothing else (a switch the code checks) |
dep:x turns on the optional dependency x; x/y turns on feature y of dependency x (with ?, only if x is already on).
MSRV history
The minimum Rust version h2 declares (rust-version), and the release that changed it:
- 0.3.18 (2023-04-17): Rust 1.56
- 0.3.21 (2023-08-21): Rust 1.63
Stuck on an older compiler? Pin the last version that supports it, for example cargo update -p h2 --precise <version>, or use resolver 3, which picks compatible versions for you.
More on h2
Real downloads, dependents and alternatives: h2 crate data (2.3M real downloads a day, 296 dependents).
Security record: h2 advisories.
docs.rs feature list · crates.io · license MIT · edition 2021
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