Trait OptionalFromRequest 

pub trait OptionalFromRequest:
    Sized
    + Send
    + Sync
    + 'static {
    type Rejection: IntoResponse;

    // Required method
    fn from_request(
        req: Request,
    ) -> impl Future<Output = Result<Option<Self>, Self::Rejection>> + Send;
}

Available on crate feature http only.

Customize the behavior of Option<Self> as a FromRequest 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( req: Request, ) -> 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".

Implementors

impl OptionalFromRequest for OctetStream

type Rejection = OctetStreamRejection

impl<T> OptionalFromRequest for JsonReadStream<T, BodyDataStream>

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

type Rejection = Infallible

impl<T> OptionalFromRequest for ReadSignals<T>

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

type Rejection = Response

impl<T> OptionalFromRequest for Json<T>

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

type Rejection = JsonRejection