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<!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="API documentation for the Rust `SessionBackend` trait in crate `actix_web`."><meta name="keywords" content="rust, rustlang, rust-lang, SessionBackend"><title>actix_web::middleware::session::SessionBackend - Rust</title><link rel="stylesheet" type="text/css" href="../../../normalize.css"><link rel="stylesheet" type="text/css" href="../../../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" type="text/css" href="../../../dark.css"><link rel="stylesheet" type="text/css" href="../../../light.css" id="themeStyle"><script src="../../../storage.js"></script></head><body class="rustdoc trait"><!--[if lte IE 8]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><div class="sidebar-menu">☰</div><p class='location'>Trait SessionBackend</p><div class="sidebar-elems"><div class="block items"><a class="sidebar-title" href="#associated-types">Associated Types</a><div class="sidebar-links"><a href="#associatedtype.Session">Session</a><a href="#associatedtype.ReadFuture">ReadFuture</a></div><a class="sidebar-title" href="#required-methods">Required Methods</a><div class="sidebar-links"><a href="#tymethod.from_request">from_request</a></div><a class="sidebar-title" href="#implementors">Implementors</a></div><p class='location'><a href='../../index.html'>actix_web</a>::<wbr><a href='../index.html'>middleware</a>::<wbr><a href='index.html'>session</a></p><script>window.sidebarCurrent = {name: 'SessionBackend', ty: 'trait', relpath: ''};</script><script defer src="sidebar-items.js"></script></div></nav><div class="theme-picker"><button id="theme-picker" aria-label="Pick another theme!"><img src="../../../brush.svg" width="18" alt="Pick another theme!"></button><div id="theme-choices"></div></div><script src="../../../theme.js"></script><nav class="sub"><form class="search-form js-only"><div class="search-container"><input class="search-input" name="search" autocomplete="off" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"><a id="settings-menu" href="../../../settings.html"><img src="../../../wheel.svg" width="18" alt="Change settings"></a></div></form></nav><section id="main" class="content"><h1 class='fqn'><span class='out-of-band'><span id='render-detail'><a id="toggle-all-docs" href="javascript:void(0)" title="collapse all docs">[<span class='inner'>−</span>]</a></span><a class='srclink' href='../../../src/actix_web/middleware/session.rs.html#291-299' title='goto source code'>[src]</a></span><span class='in-band'>Trait <a href='../../index.html'>actix_web</a>::<wbr><a href='../index.html'>middleware</a>::<wbr><a href='index.html'>session</a>::<wbr><a class="trait" href=''>SessionBackend</a></span></h1><div class="docblock type-decl hidden-by-usual-hider"><pre class='rust trait'>pub trait SessionBackend<S>: <a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a> + 'static {
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type <a href='#associatedtype.Session' class="type">Session</a>: <a class="trait" href="../../../actix_web/middleware/session/trait.SessionImpl.html" title="trait actix_web::middleware::session::SessionImpl">SessionImpl</a>;
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type <a href='#associatedtype.ReadFuture' class="type">ReadFuture</a>: <a class="trait" href="https://docs.rs/futures/0.1/futures/future/trait.Future.html" title="trait futures::future::Future">Future</a><Item = Self::<a class="type" href="../../../actix_web/middleware/session/trait.SessionBackend.html#associatedtype.Session" title="type actix_web::middleware::session::SessionBackend::Session">Session</a>, Error = <a class="struct" href="../../../actix_web/error/struct.Error.html" title="struct actix_web::error::Error">Error</a>>;
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fn <a href='#tymethod.from_request' class='fnname'>from_request</a>(&self, request: &mut <a class="struct" href="../../../actix_web/struct.HttpRequest.html" title="struct actix_web::HttpRequest">HttpRequest</a><S>) -> Self::<a class="type" href="../../../actix_web/middleware/session/trait.SessionBackend.html#associatedtype.ReadFuture" title="type actix_web::middleware::session::SessionBackend::ReadFuture">ReadFuture</a>;
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}</pre></div><div class='docblock'><p>Session's storage backend trait definition.</p>
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</div>
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<h2 id='associated-types' class='small-section-header'>
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Associated Types<a href='#associated-types' class='anchor'></a>
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</h2>
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<div class='methods'>
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<h3 id='associatedtype.Session' class='method'><span id='Session.t' class='invisible'><code>type <a href='#associatedtype.Session' class="type">Session</a>: <a class="trait" href="../../../actix_web/middleware/session/trait.SessionImpl.html" title="trait actix_web::middleware::session::SessionImpl">SessionImpl</a></code></span></h3><div class='docblock'><p>Session item</p>
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</div><h3 id='associatedtype.ReadFuture' class='method'><span id='ReadFuture.t' class='invisible'><code>type <a href='#associatedtype.ReadFuture' class="type">ReadFuture</a>: <a class="trait" href="https://docs.rs/futures/0.1/futures/future/trait.Future.html" title="trait futures::future::Future">Future</a><Item = Self::<a class="type" href="../../../actix_web/middleware/session/trait.SessionBackend.html#associatedtype.Session" title="type actix_web::middleware::session::SessionBackend::Session">Session</a>, Error = <a class="struct" href="../../../actix_web/error/struct.Error.html" title="struct actix_web::error::Error">Error</a>></code></span></h3><div class='docblock'><p>Future that reads session</p>
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</div></div>
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<h2 id='required-methods' class='small-section-header'>
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Required Methods<a href='#required-methods' class='anchor'></a>
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</h2>
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<div class='methods'>
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<h3 id='tymethod.from_request' class='method'><span id='from_request.v' class='invisible'><code>fn <a href='#tymethod.from_request' class='fnname'>from_request</a>(&self, request: &mut <a class="struct" href="../../../actix_web/struct.HttpRequest.html" title="struct actix_web::HttpRequest">HttpRequest</a><S>) -> Self::<a class="type" href="../../../actix_web/middleware/session/trait.SessionBackend.html#associatedtype.ReadFuture" title="type actix_web::middleware::session::SessionBackend::ReadFuture">ReadFuture</a></code></span></h3><div class='docblock'><p>Parse the session from request and load data from a storage backend.</p>
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</div></div><h2 id='implementors' class='small-section-header'>Implementors<a href='#implementors' class='anchor'></a></h2><div class='item-list' id='implementors-list'><h3 id='impl-SessionBackend%3CS%3E' class='impl'><span class='in-band'><table class='table-display'><tbody><tr><td><code>impl<S> SessionBackend<S> for <a class="struct" href="../../../actix_web/middleware/session/struct.CookieSessionBackend.html" title="struct actix_web::middleware::session::CookieSessionBackend">CookieSessionBackend</a></code><a href='#impl-SessionBackend%3CS%3E' class='anchor'></a></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../../src/actix_web/middleware/session.rs.html#560-572' title='goto source code'>[src]</a></span></td></tr></tbody></table></h3><div class='impl-items'><h4 id='associatedtype.Session-1' class="type"><span id='Session.t-1' class='invisible'><code>type <a href='#associatedtype.Session-1' class="type">Session</a> = <a class="struct" href="../../../actix_web/middleware/session/struct.CookieSession.html" title="struct actix_web::middleware::session::CookieSession">CookieSession</a></code></span></h4>
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<h4 id='associatedtype.ReadFuture-1' class="type"><span id='ReadFuture.t-1' class='invisible'><code>type <a href='#associatedtype.ReadFuture-1' class="type">ReadFuture</a> = <a class="struct" href="https://docs.rs/futures/0.1/futures/future/result_/struct.FutureResult.html" title="struct futures::future::result_::FutureResult">FutureResult</a><<a class="struct" href="../../../actix_web/middleware/session/struct.CookieSession.html" title="struct actix_web::middleware::session::CookieSession">CookieSession</a>, <a class="struct" href="../../../actix_web/error/struct.Error.html" title="struct actix_web::error::Error">Error</a>></code></span></h4>
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<h4 id='method.from_request' class="method"><span id='from_request.v-1' class='invisible'><table class='table-display'><tbody><tr><td><code>fn <a href='#method.from_request' class='fnname'>from_request</a>(&self, req: &mut <a class="struct" href="../../../actix_web/struct.HttpRequest.html" title="struct actix_web::HttpRequest">HttpRequest</a><S>) -> Self::<a class="type" href="../../../actix_web/middleware/session/trait.SessionBackend.html#associatedtype.ReadFuture" title="type actix_web::middleware::session::SessionBackend::ReadFuture">ReadFuture</a></code></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../../src/actix_web/middleware/session.rs.html#564-571' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4></div></div><script type="text/javascript">window.inlined_types=new Set([]);</script><script type="text/javascript" async
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src="../../../implementors/actix_web/middleware/session/trait.SessionBackend.js">
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</script></section><section id="search" class="content hidden"></section><section class="footer"></section><aside id="help" class="hidden"><div><h1 class="hidden">Help</h1><div class="shortcuts"><h2>Keyboard Shortcuts</h2><dl><dt><kbd>?</kbd></dt><dd>Show this help dialog</dd><dt><kbd>S</kbd></dt><dd>Focus the search field</dd><dt><kbd>↑</kbd></dt><dd>Move up in search results</dd><dt><kbd>↓</kbd></dt><dd>Move down in search results</dd><dt><kbd>↹</kbd></dt><dd>Switch tab</dd><dt><kbd>⏎</kbd></dt><dd>Go to active search result</dd><dt><kbd>+</kbd></dt><dd>Expand all sections</dd><dt><kbd>-</kbd></dt><dd>Collapse all sections</dd></dl></div><div class="infos"><h2>Search Tricks</h2><p>Prefix searches with a type followed by a colon (e.g. <code>fn:</code>) to restrict the search to a given type.</p><p>Accepted types are: <code>fn</code>, <code>mod</code>, <code>struct</code>, <code>enum</code>, <code>trait</code>, <code>type</code>, <code>macro</code>, and <code>const</code>.</p><p>Search functions by type signature (e.g. <code>vec -> usize</code> or <code>* -> vec</code>)</p><p>Search multiple things at once by splitting your query with comma (e.g. <code>str,u8</code> or <code>String,struct:Vec,test</code>)</p></div></div></aside><script>window.rootPath = "../../../";window.currentCrate = "actix_web";</script><script src="../../../aliases.js"></script><script src="../../../main.js"></script><script defer src="../../../search-index.js"></script></body></html>
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