# actix_web::middleware::session::SessionBackend - Rust
API documentation for the Rust `SessionBackend` trait in crate `actix_web`.
Keywords: rust, rustlang, rust-lang, SessionBackend

# [−] [src] Trait actix_web::middleware::session::SessionBackend

    pub trait SessionBackend<S>: Sized + 'static {
        type Session: SessionImpl;
        type ReadFuture: Future<Item = Self::Session, Error = Error>;
        fn from_request(&self, request: &mut HttpRequest<S>) -> Self::ReadFuture;
    }

Session's storage backend trait definition.

## Associated Types

### `type Session: SessionImpl`

Session item

### `type ReadFuture: Future<Item = Self::Session, Error = Error>`

Future that reads session

## Required Methods

### `fn from_request(&self, request: &mut HttpRequest<S>) -> Self::ReadFuture`

Parse the session from request and load data from a storage backend.

## Implementors

###

`impl<S> SessionBackend<S> for CookieSessionBackend`

[src]

#### `type Session = CookieSession`

#### `type ReadFuture = FutureResult<CookieSession, Error>`

####

`fn from_request(&self, req: &mut HttpRequest<S>) -> Self::ReadFuture`

[src]

# Help

## Keyboard Shortcuts

`?`
  Show this help dialog
`S`
  Focus the search field
`↑`
  Move up in search results
`↓`
  Move down in search results
`↹`
  Switch tab
`⏎`
  Go to active search result
`+`
  Expand all sections
`-`
  Collapse all sections

## Search Tricks

Prefix searches with a type followed by a colon (e.g. `fn:`) to restrict the search to a given type.

Accepted types are: `fn`, `mod`, `struct`, `enum`, `trait`, `type`, `macro`, and `const`.

Search functions by type signature (e.g. `vec -> usize` or `* -> vec`)

Search multiple things at once by splitting your query with comma (e.g. `str,u8` or `String,struct:Vec,test`)