axum::extract

Trait FromRequest

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pub trait FromRequest<S, M = ViaRequest>: Sized {
    type Rejection: IntoResponse;

    // Required method
    fn from_request<'life0, 'async_trait>(
        req: Request<Body>,
        state: &'life0 S,
    ) -> Pin<Box<dyn Future<Output = Result<Self, Self::Rejection>> + Send + 'async_trait>>
       where 'life0: 'async_trait,
             Self: 'async_trait;
}
Expand description

Types that can be created from requests.

Extractors that implement FromRequest can consume the request body and can thus only be run once for handlers.

If your extractor doesn’t need to consume the request body then you should implement FromRequestParts and not FromRequest.

See axum::extract for more general docs about extractors.

Required Associated Types§

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type Rejection: IntoResponse

If the extractor fails it’ll use this “rejection” type. A rejection is a kind of error that can be converted into a response.

Required Methods§

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fn from_request<'life0, 'async_trait>( req: Request<Body>, state: &'life0 S, ) -> Pin<Box<dyn Future<Output = Result<Self, Self::Rejection>> + Send + 'async_trait>>
where 'life0: 'async_trait, Self: 'async_trait,

Perform the extraction.

Dyn Compatibility§

This trait is not dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety", so this trait is not object safe.

Implementations on Foreign Types§

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impl<S> FromRequest<S> for Bytes
where S: Send + Sync,

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type Rejection = BytesRejection

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fn from_request<'life0, 'async_trait>( req: Request<Body>, _: &'life0 S, ) -> Pin<Box<dyn Future<Output = Result<Bytes, <Bytes as FromRequest<S>>::Rejection>> + Send + 'async_trait>>
where 'life0: 'async_trait, Bytes: 'async_trait,

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impl<S> FromRequest<S> for BytesMut
where S: Send + Sync,

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type Rejection = BytesRejection

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fn from_request<'life0, 'async_trait>( req: Request<Body>, _: &'life0 S, ) -> Pin<Box<dyn Future<Output = Result<BytesMut, <BytesMut as FromRequest<S>>::Rejection>> + Send + 'async_trait>>
where 'life0: 'async_trait, BytesMut: 'async_trait,

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impl<S> FromRequest<S> for Request<Body>
where S: Send + Sync,

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type Rejection = Infallible

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fn from_request<'life0, 'async_trait>( req: Request<Body>, _: &'life0 S, ) -> Pin<Box<dyn Future<Output = Result<Request<Body>, <Request<Body> as FromRequest<S>>::Rejection>> + Send + 'async_trait>>
where 'life0: 'async_trait, Request<Body>: 'async_trait,

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impl<S> FromRequest<S> for String
where S: Send + Sync,

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type Rejection = StringRejection

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fn from_request<'life0, 'async_trait>( req: Request<Body>, state: &'life0 S, ) -> Pin<Box<dyn Future<Output = Result<String, <String as FromRequest<S>>::Rejection>> + Send + 'async_trait>>
where 'life0: 'async_trait, String: 'async_trait,

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impl<S, T1> FromRequest<S> for (T1,)
where T1: FromRequest<S> + Send, S: Send + Sync,

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type Rejection = Response<Body>

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fn from_request<'life0, 'async_trait>( req: Request<Body>, state: &'life0 S, ) -> Pin<Box<dyn Future<Output = Result<(T1,), <(T1,) as FromRequest<S>>::Rejection>> + Send + 'async_trait>>
where 'life0: 'async_trait, (T1,): 'async_trait,

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impl<S, T1, T2> FromRequest<S> for (T1, T2)
where T1: FromRequestParts<S> + Send, T2: FromRequest<S> + Send, S: Send + Sync,

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type Rejection = Response<Body>

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fn from_request<'life0, 'async_trait>( req: Request<Body>, state: &'life0 S, ) -> Pin<Box<dyn Future<Output = Result<(T1, T2), <(T1, T2) as FromRequest<S>>::Rejection>> + Send + 'async_trait>>
where 'life0: 'async_trait, (T1, T2): 'async_trait,

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impl<S, T1, T2, T3> FromRequest<S> for (T1, T2, T3)
where T1: FromRequestParts<S> + Send, T2: FromRequestParts<S> + Send, T3: FromRequest<S> + Send, S: Send + Sync,

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type Rejection = Response<Body>

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fn from_request<'life0, 'async_trait>( req: Request<Body>, state: &'life0 S, ) -> Pin<Box<dyn Future<Output = Result<(T1, T2, T3), <(T1, T2, T3) as FromRequest<S>>::Rejection>> + Send + 'async_trait>>
where 'life0: 'async_trait, (T1, T2, T3): 'async_trait,

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impl<S, T1, T2, T3, T4> FromRequest<S> for (T1, T2, T3, T4)
where T1: FromRequestParts<S> + Send, T2: FromRequestParts<S> + Send, T3: FromRequestParts<S> + Send, T4: FromRequest<S> + Send, S: Send + Sync,

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type Rejection = Response<Body>

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fn from_request<'life0, 'async_trait>( req: Request<Body>, state: &'life0 S, ) -> Pin<Box<dyn Future<Output = Result<(T1, T2, T3, T4), <(T1, T2, T3, T4) as FromRequest<S>>::Rejection>> + Send + 'async_trait>>
where 'life0: 'async_trait, (T1, T2, T3, T4): 'async_trait,

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impl<S, T1, T2, T3, T4, T5> FromRequest<S> for (T1, T2, T3, T4, T5)
where T1: FromRequestParts<S> + Send, T2: FromRequestParts<S> + Send, T3: FromRequestParts<S> + Send, T4: FromRequestParts<S> + Send, T5: FromRequest<S> + Send, S: Send + Sync,

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type Rejection = Response<Body>

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fn from_request<'life0, 'async_trait>( req: Request<Body>, state: &'life0 S, ) -> Pin<Box<dyn Future<Output = Result<(T1, T2, T3, T4, T5), <(T1, T2, T3, T4, T5) as FromRequest<S>>::Rejection>> + Send + 'async_trait>>
where 'life0: 'async_trait, (T1, T2, T3, T4, T5): 'async_trait,

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impl<S, T1, T2, T3, T4, T5, T6> FromRequest<S> for (T1, T2, T3, T4, T5, T6)
where T1: FromRequestParts<S> + Send, T2: FromRequestParts<S> + Send, T3: FromRequestParts<S> + Send, T4: FromRequestParts<S> + Send, T5: FromRequestParts<S> + Send, T6: FromRequest<S> + Send, S: Send + Sync,

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type Rejection = Response<Body>

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fn from_request<'life0, 'async_trait>( req: Request<Body>, state: &'life0 S, ) -> Pin<Box<dyn Future<Output = Result<(T1, T2, T3, T4, T5, T6), <(T1, T2, T3, T4, T5, T6) as FromRequest<S>>::Rejection>> + Send + 'async_trait>>
where 'life0: 'async_trait, (T1, T2, T3, T4, T5, T6): 'async_trait,

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impl<S, T1, T2, T3, T4, T5, T6, T7> FromRequest<S> for (T1, T2, T3, T4, T5, T6, T7)
where T1: FromRequestParts<S> + Send, T2: FromRequestParts<S> + Send, T3: FromRequestParts<S> + Send, T4: FromRequestParts<S> + Send, T5: FromRequestParts<S> + Send, T6: FromRequestParts<S> + Send, T7: FromRequest<S> + Send, S: Send + Sync,

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type Rejection = Response<Body>

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fn from_request<'life0, 'async_trait>( req: Request<Body>, state: &'life0 S, ) -> Pin<Box<dyn Future<Output = Result<(T1, T2, T3, T4, T5, T6, T7), <(T1, T2, T3, T4, T5, T6, T7) as FromRequest<S>>::Rejection>> + Send + 'async_trait>>
where 'life0: 'async_trait, (T1, T2, T3, T4, T5, T6, T7): 'async_trait,

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impl<S, T1, T2, T3, T4, T5, T6, T7, T8> FromRequest<S> for (T1, T2, T3, T4, T5, T6, T7, T8)
where T1: FromRequestParts<S> + Send, T2: FromRequestParts<S> + Send, T3: FromRequestParts<S> + Send, T4: FromRequestParts<S> + Send, T5: FromRequestParts<S> + Send, T6: FromRequestParts<S> + Send, T7: FromRequestParts<S> + Send, T8: FromRequest<S> + Send, S: Send + Sync,

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type Rejection = Response<Body>

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fn from_request<'life0, 'async_trait>( req: Request<Body>, state: &'life0 S, ) -> Pin<Box<dyn Future<Output = Result<(T1, T2, T3, T4, T5, T6, T7, T8), <(T1, T2, T3, T4, T5, T6, T7, T8) as FromRequest<S>>::Rejection>> + Send + 'async_trait>>
where 'life0: 'async_trait, (T1, T2, T3, T4, T5, T6, T7, T8): 'async_trait,

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impl<S, T1, T2, T3, T4, T5, T6, T7, T8, T9> FromRequest<S> for (T1, T2, T3, T4, T5, T6, T7, T8, T9)
where T1: FromRequestParts<S> + Send, T2: FromRequestParts<S> + Send, T3: FromRequestParts<S> + Send, T4: FromRequestParts<S> + Send, T5: FromRequestParts<S> + Send, T6: FromRequestParts<S> + Send, T7: FromRequestParts<S> + Send, T8: FromRequestParts<S> + Send, T9: FromRequest<S> + Send, S: Send + Sync,

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type Rejection = Response<Body>

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fn from_request<'life0, 'async_trait>( req: Request<Body>, state: &'life0 S, ) -> Pin<Box<dyn Future<Output = Result<(T1, T2, T3, T4, T5, T6, T7, T8, T9), <(T1, T2, T3, T4, T5, T6, T7, T8, T9) as FromRequest<S>>::Rejection>> + Send + 'async_trait>>
where 'life0: 'async_trait, (T1, T2, T3, T4, T5, T6, T7, T8, T9): 'async_trait,

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impl<S, T1, T2, T3, T4, T5, T6, T7, T8, T9, T10> FromRequest<S> for (T1, T2, T3, T4, T5, T6, T7, T8, T9, T10)
where T1: FromRequestParts<S> + Send, T2: FromRequestParts<S> + Send, T3: FromRequestParts<S> + Send, T4: FromRequestParts<S> + Send, T5: FromRequestParts<S> + Send, T6: FromRequestParts<S> + Send, T7: FromRequestParts<S> + Send, T8: FromRequestParts<S> + Send, T9: FromRequestParts<S> + Send, T10: FromRequest<S> + Send, S: Send + Sync,

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type Rejection = Response<Body>

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fn from_request<'life0, 'async_trait>( req: Request<Body>, state: &'life0 S, ) -> Pin<Box<dyn Future<Output = Result<(T1, T2, T3, T4, T5, T6, T7, T8, T9, T10), <(T1, T2, T3, T4, T5, T6, T7, T8, T9, T10) as FromRequest<S>>::Rejection>> + Send + 'async_trait>>
where 'life0: 'async_trait, (T1, T2, T3, T4, T5, T6, T7, T8, T9, T10): 'async_trait,

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impl<S, T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11> FromRequest<S> for (T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11)
where T1: FromRequestParts<S> + Send, T2: FromRequestParts<S> + Send, T3: FromRequestParts<S> + Send, T4: FromRequestParts<S> + Send, T5: FromRequestParts<S> + Send, T6: FromRequestParts<S> + Send, T7: FromRequestParts<S> + Send, T8: FromRequestParts<S> + Send, T9: FromRequestParts<S> + Send, T10: FromRequestParts<S> + Send, T11: FromRequest<S> + Send, S: Send + Sync,

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type Rejection = Response<Body>

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fn from_request<'life0, 'async_trait>( req: Request<Body>, state: &'life0 S, ) -> Pin<Box<dyn Future<Output = Result<(T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11), <(T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11) as FromRequest<S>>::Rejection>> + Send + 'async_trait>>
where 'life0: 'async_trait, (T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11): 'async_trait,

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impl<S, T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12> FromRequest<S> for (T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12)
where T1: FromRequestParts<S> + Send, T2: FromRequestParts<S> + Send, T3: FromRequestParts<S> + Send, T4: FromRequestParts<S> + Send, T5: FromRequestParts<S> + Send, T6: FromRequestParts<S> + Send, T7: FromRequestParts<S> + Send, T8: FromRequestParts<S> + Send, T9: FromRequestParts<S> + Send, T10: FromRequestParts<S> + Send, T11: FromRequestParts<S> + Send, T12: FromRequest<S> + Send, S: Send + Sync,

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type Rejection = Response<Body>

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fn from_request<'life0, 'async_trait>( req: Request<Body>, state: &'life0 S, ) -> Pin<Box<dyn Future<Output = Result<(T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12), <(T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12) as FromRequest<S>>::Rejection>> + Send + 'async_trait>>
where 'life0: 'async_trait, (T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12): 'async_trait,

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impl<S, T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13> FromRequest<S> for (T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13)
where T1: FromRequestParts<S> + Send, T2: FromRequestParts<S> + Send, T3: FromRequestParts<S> + Send, T4: FromRequestParts<S> + Send, T5: FromRequestParts<S> + Send, T6: FromRequestParts<S> + Send, T7: FromRequestParts<S> + Send, T8: FromRequestParts<S> + Send, T9: FromRequestParts<S> + Send, T10: FromRequestParts<S> + Send, T11: FromRequestParts<S> + Send, T12: FromRequestParts<S> + Send, T13: FromRequest<S> + Send, S: Send + Sync,

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type Rejection = Response<Body>

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fn from_request<'life0, 'async_trait>( req: Request<Body>, state: &'life0 S, ) -> Pin<Box<dyn Future<Output = Result<(T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13), <(T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13) as FromRequest<S>>::Rejection>> + Send + 'async_trait>>
where 'life0: 'async_trait, (T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13): 'async_trait,

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impl<S, T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14> FromRequest<S> for (T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14)
where T1: FromRequestParts<S> + Send, T2: FromRequestParts<S> + Send, T3: FromRequestParts<S> + Send, T4: FromRequestParts<S> + Send, T5: FromRequestParts<S> + Send, T6: FromRequestParts<S> + Send, T7: FromRequestParts<S> + Send, T8: FromRequestParts<S> + Send, T9: FromRequestParts<S> + Send, T10: FromRequestParts<S> + Send, T11: FromRequestParts<S> + Send, T12: FromRequestParts<S> + Send, T13: FromRequestParts<S> + Send, T14: FromRequest<S> + Send, S: Send + Sync,

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type Rejection = Response<Body>

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fn from_request<'life0, 'async_trait>( req: Request<Body>, state: &'life0 S, ) -> Pin<Box<dyn Future<Output = Result<(T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14), <(T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14) as FromRequest<S>>::Rejection>> + Send + 'async_trait>>
where 'life0: 'async_trait, (T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14): 'async_trait,

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impl<S, T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14, T15> FromRequest<S> for (T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14, T15)
where T1: FromRequestParts<S> + Send, T2: FromRequestParts<S> + Send, T3: FromRequestParts<S> + Send, T4: FromRequestParts<S> + Send, T5: FromRequestParts<S> + Send, T6: FromRequestParts<S> + Send, T7: FromRequestParts<S> + Send, T8: FromRequestParts<S> + Send, T9: FromRequestParts<S> + Send, T10: FromRequestParts<S> + Send, T11: FromRequestParts<S> + Send, T12: FromRequestParts<S> + Send, T13: FromRequestParts<S> + Send, T14: FromRequestParts<S> + Send, T15: FromRequest<S> + Send, S: Send + Sync,

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type Rejection = Response<Body>

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fn from_request<'life0, 'async_trait>( req: Request<Body>, state: &'life0 S, ) -> Pin<Box<dyn Future<Output = Result<(T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14, T15), <(T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14, T15) as FromRequest<S>>::Rejection>> + Send + 'async_trait>>
where 'life0: 'async_trait, (T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14, T15): 'async_trait,

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impl<S, T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14, T15, T16> FromRequest<S> for (T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14, T15, T16)
where T1: FromRequestParts<S> + Send, T2: FromRequestParts<S> + Send, T3: FromRequestParts<S> + Send, T4: FromRequestParts<S> + Send, T5: FromRequestParts<S> + Send, T6: FromRequestParts<S> + Send, T7: FromRequestParts<S> + Send, T8: FromRequestParts<S> + Send, T9: FromRequestParts<S> + Send, T10: FromRequestParts<S> + Send, T11: FromRequestParts<S> + Send, T12: FromRequestParts<S> + Send, T13: FromRequestParts<S> + Send, T14: FromRequestParts<S> + Send, T15: FromRequestParts<S> + Send, T16: FromRequest<S> + Send, S: Send + Sync,

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type Rejection = Response<Body>

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fn from_request<'life0, 'async_trait>( req: Request<Body>, state: &'life0 S, ) -> Pin<Box<dyn Future<Output = Result<(T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14, T15, T16), <(T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14, T15, T16) as FromRequest<S>>::Rejection>> + Send + 'async_trait>>
where 'life0: 'async_trait, (T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14, T15, T16): 'async_trait,

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impl<S, T> FromRequest<S> for Option<T>
where T: FromRequest<S>, S: Send + Sync,

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type Rejection = Infallible

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fn from_request<'life0, 'async_trait>( req: Request<Body>, state: &'life0 S, ) -> Pin<Box<dyn Future<Output = Result<Option<T>, <Option<T> as FromRequest<S>>::Rejection>> + Send + 'async_trait>>
where 'life0: 'async_trait, Option<T>: 'async_trait,

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impl<S, T> FromRequest<S> for Result<T, <T as FromRequest<S>>::Rejection>
where T: FromRequest<S>, S: Send + Sync,

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type Rejection = Infallible

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fn from_request<'life0, 'async_trait>( req: Request<Body>, state: &'life0 S, ) -> Pin<Box<dyn Future<Output = Result<Result<T, <T as FromRequest<S>>::Rejection>, <Result<T, <T as FromRequest<S>>::Rejection> as FromRequest<S>>::Rejection>> + Send + 'async_trait>>
where 'life0: 'async_trait, Result<T, <T as FromRequest<S>>::Rejection>: 'async_trait,

Implementors§

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impl<S> FromRequest<S> for Body
where S: Send + Sync,

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type Rejection = Infallible

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impl<S> FromRequest<S> for RawForm
where S: Send + Sync,

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type Rejection = RawFormRejection

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impl<S, T> FromRequest<S, ViaParts> for T
where S: Send + Sync, T: FromRequestParts<S>,

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type Rejection = <T as FromRequestParts<S>>::Rejection

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impl<T, S> FromRequest<S> for Json<T>
where T: DeserializeOwned, S: Send + Sync,

Available on crate feature json only.
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type Rejection = JsonRejection