Trait OptionalFromRequestParts 

pub trait OptionalFromRequestParts<S>: Sized {
    type Rejection: IntoResponse;

    // Required method
    fn from_request_parts(
        parts: &mut Parts,
        state: &S,
    ) -> impl Future<Output = Result<Option<Self>, Self::Rejection>> + Send;
}

Customize the behavior of Option<Self> as a FromRequestParts extractor.

Required Associated Types

type Rejection: IntoResponse

If the extractor fails, it will use this “rejection” type.

A rejection is a kind of error that can be converted into a response.

Required Methods

fn from_request_parts( parts: &mut Parts, state: &S, ) -> impl Future<Output = Result<Option<Self>, Self::Rejection>> + Send

Perform the extraction.

Dyn Compatibility

This trait is not dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety".

Implementations on Foreign Types

impl<S> OptionalFromRequestParts<S> for Host

where S: Send + Sync,

type Rejection = Infallible

async fn from_request_parts( parts: &mut Parts, _state: &S, ) -> Result<Option<Host>, <Host as OptionalFromRequestParts<S>>::Rejection>

Implementors

impl<T, S> OptionalFromRequestParts<S> for Extension<T>

where T: Clone + Send + Sync + 'static, S: Send + Sync,

type Rejection = Infallible

impl<T, S> OptionalFromRequestParts<S> for Path<T>

where T: DeserializeOwned + Send + 'static, S: Send + Sync,

type Rejection = PathRejection