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Updated docs regarding constraints of Handler arguments #2451

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Dec 29, 2023
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Updated docs regarding constraints of Handler arguments #2451

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4 changes: 3 additions & 1 deletion axum/src/docs/debugging_handler_type_errors.md
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Expand Up @@ -4,7 +4,9 @@ For a function to be used as a handler it must implement the [`Handler`] trait.
axum provides blanket implementations for functions that:

- Are `async fn`s.
- Take no more than 16 arguments that all implement [`FromRequest`].
- Take no more than 16 arguments that all implement `Send`.
- All except the last argument implement [`FromRequestParts`].
- The last argument implements [`FromRequest`].
- Returns something that implements [`IntoResponse`].
- If a closure is used it must implement `Clone + Send` and be
`'static`.
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