<commit_before>//! Request identity service for Actix applications.
//!
//! [**IdentityService**](struct.IdentityService.html) middleware can be
//! used with different policies types to store identity information.
//!
//! Bu default, only cookie identity policy is implemented. Other backend
//! implementations can be added separately.
//!
//! [**CookieIdentityPolicy**](struct.CookieIdentityPolicy.html)
//! uses cookies as identity storage.
//!
//! To access current request identity
//! [**RequestIdentity**](trait.RequestIdentity.html) should be used.
//! *HttpRequest* implements *RequestIdentity* trait.
//!
//! ```rust
//! use actix_web::middleware::identity::RequestIdentity;
//! use actix_web::middleware::identity::{CookieIdentityPolicy, IdentityService};
//! use actix_web::*;
//!
//! fn index(req: HttpRequest) -> Result<String> {
//!     // access request identity
//!     if let Some(id) = req.identity() {
//!         Ok(format!("Welcome! {}", id))
//!     } else {
//!         Ok("Welcome Anonymous!".to_owned())
//!     }
//! }
//!
//! fn login(mut req: HttpRequest) -> HttpResponse {<commit_msg>Fix typo<commit_after>//! Request identity service for Actix applications.
//!
//! [**IdentityService**](struct.IdentityService.html) middleware can be
//! used with different policies types to store identity information.
//!
//! By default, only cookie identity policy is implemented. Other backend
//! implementations can be added separately.
//!
//! [**CookieIdentityPolicy**](struct.CookieIdentityPolicy.html)
//! uses cookies as identity storage.
//!
//! To access current request identity
//! [**RequestIdentity**](trait.RequestIdentity.html) should be used.
//! *HttpRequest* implements *RequestIdentity* trait.
//!
//! ```rust
//! use actix_web::middleware::identity::RequestIdentity;
//! use actix_web::middleware::identity::{CookieIdentityPolicy, IdentityService};
//! use actix_web::*;
//!
//! fn index(req: HttpRequest) -> Result<String> {
//!     // access request identity
//!     if let Some(id) = req.identity() {
//!         Ok(format!("Welcome! {}", id))
//!     } else {
//!         Ok("Welcome Anonymous!".to_owned())
//!     }
//! }
//!
//! fn login(mut req: HttpRequest) -> HttpResponse {
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