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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 `App` struct in crate `actix_web`."><meta name="keywords" content="rust, rustlang, rust-lang, App"><title>actix_web::App - 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 struct"><!--[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">&#9776;</div><p class='location'>Struct App</p><div class="sidebar-elems"><div class="block items"><a class="sidebar-title" href="#methods">Methods</a><div class="sidebar-links"><a href="#method.new">new</a><a href="#method.with_state">with_state</a><a href="#method.state">state</a><a href="#method.prefix">prefix</a><a href="#method.filter">filter</a><a href="#method.route">route</a><a href="#method.scope">scope</a><a href="#method.resource">resource</a><a href="#method.default_resource">default_resource</a><a href="#method.default_encoding">default_encoding</a><a href="#method.external_resource">external_resource</a><a href="#method.handler">handler</a><a href="#method.middleware">middleware</a><a href="#method.configure">configure</a><a href="#method.finish">finish</a><a href="#method.boxed">boxed</a></div><a class="sidebar-title" href="#implementations">Trait Implementations</a><div class="sidebar-links"><a href="#impl-Default">Default</a><a href="#impl-IntoHttpHandler">IntoHttpHandler</a></div><a class="sidebar-title" href="#synthetic-implementations">Auto Trait Implementations</a><div class="sidebar-links"><a href="#impl-Send">!Send</a><a href="#impl-Sync">!Sync</a></div></div><p class='location'><a href='index.html'>actix_web</a></p><script>window.sidebarCurrent = {name: 'App', ty: 'struct', 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='in-band'>Struct <a href='index.html'>actix_web</a>::<wbr><a class="struct" href=''>App</a></span><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'>&#x2212;</span>]</a></span><a class='srclink' href='../src/actix_web/application.rs.html#104-106' title='goto source code'>[src]</a></span></h1><div class="docblock type-decl"><pre class='rust struct'>pub struct App&lt;S&nbsp;=&nbsp;<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.unit.html">()</a>&gt; { /* fields omitted */ }</pre></div><div class='docblock'><p>Structure that follows the builder pattern for building application
instances.</p>
</div>
<h2 id='methods' class='small-section-header'>
Methods<a href='#methods' class='anchor'></a>
</h2>
<h3 id='impl' class='impl'><span class='in-band'><table class='table-display'><tbody><tr><td><code>impl <a class="struct" href="../actix_web/struct.App.html" title="struct actix_web::App">App</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.unit.html">()</a>&gt;</code><a href='#impl' class='anchor'></a></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/actix_web/application.rs.html#108-114' title='goto source code'>[src]</a></span></td></tr></tbody></table></h3><div class='impl-items'><h4 id='method.new' class="method"><span id='new.v' class='invisible'><table class='table-display'><tbody><tr><td><code>pub fn <a href='#method.new' class='fnname'>new</a>() -&gt; <a class="struct" href="../actix_web/struct.App.html" title="struct actix_web::App">App</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.unit.html">()</a>&gt;</code></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/actix_web/application.rs.html#111-113' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><div class='docblock'><p>Create application with empty state. Application can
be configured with a builder-like pattern.</p>
</div></div><h3 id='impl-1' class='impl'><span class='in-band'><table class='table-display'><tbody><tr><td><code>impl&lt;S&gt; <a class="struct" href="../actix_web/struct.App.html" title="struct actix_web::App">App</a>&lt;S&gt; <span class="where fmt-newline">where<br>&nbsp;&nbsp;&nbsp;&nbsp;S: 'static,&nbsp;</span></code><a href='#impl-1' class='anchor'></a></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/actix_web/application.rs.html#122-563' title='goto source code'>[src]</a></span></td></tr></tbody></table></h3><div class='impl-items'><h4 id='method.with_state' class="method"><span id='with_state.v' class='invisible'><table class='table-display'><tbody><tr><td><code>pub fn <a href='#method.with_state' class='fnname'>with_state</a>(state: S) -&gt; <a class="struct" href="../actix_web/struct.App.html" title="struct actix_web::App">App</a>&lt;S&gt;</code></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/actix_web/application.rs.html#138-149' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><div class='docblock'><p>Create application with specified state. Application can be
configured with a builder-like pattern.</p>
<p>State is shared with all resources within same application and
could be accessed with <code>HttpRequest::state()</code> method.</p>
<p><strong>Note</strong>: http server accepts an application factory rather than
an application instance. Http server constructs an application
instance for each thread, thus application state must be constructed
multiple times. If you want to share state between different
threads, a shared object should be used, e.g. <code>Arc</code>. Application
state does not need to be <code>Send</code> and <code>Sync</code>.</p>
</div><h4 id='method.state' class="method"><div class="important-traits"><div class='tooltip'><span class='tooltiptext'>Important traits for <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&amp;'a mut </a>R</span></div><div class="content hidden"><h3 class="important">Important traits for <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&amp;'a mut </a>R</h3><code class="content"><span class="where fmt-newline">impl&lt;'a, R&gt; <a class="trait" href="https://doc.rust-lang.org/nightly/std/io/trait.Read.html" title="trait std::io::Read">Read</a> for <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&amp;'a mut </a>R <span class="where fmt-newline">where<br>&nbsp;&nbsp;&nbsp;&nbsp;R: <a class="trait" href="https://doc.rust-lang.org/nightly/std/io/trait.Read.html" title="trait std::io::Read">Read</a> + ?<a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,&nbsp;</span></span><span class="where fmt-newline">impl&lt;'a, W&gt; <a class="trait" href="https://doc.rust-lang.org/nightly/std/io/trait.Write.html" title="trait std::io::Write">Write</a> for <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&amp;'a mut </a>W <span class="where fmt-newline">where<br>&nbsp;&nbsp;&nbsp;&nbsp;W: <a class="trait" href="https://doc.rust-lang.org/nightly/std/io/trait.Write.html" title="trait std::io::Write">Write</a> + ?<a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,&nbsp;</span></span><span class="where fmt-newline">impl&lt;'a, I&gt; <a class="trait" href="https://doc.rust-lang.org/nightly/core/iter/iterator/trait.Iterator.html" title="trait core::iter::iterator::Iterator">Iterator</a> for <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&amp;'a mut </a>I <span class="where fmt-newline">where<br>&nbsp;&nbsp;&nbsp;&nbsp;I: <a class="trait" href="https://doc.rust-lang.org/nightly/core/iter/iterator/trait.Iterator.html" title="trait core::iter::iterator::Iterator">Iterator</a> + ?<a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,&nbsp;</span></span><span class="where fmt-newline"> type <a href='https://doc.rust-lang.org/nightly/core/iter/iterator/trait.Iterator.html#associatedtype.Item' class="type">Item</a> = &lt;I as <a class="trait" href="https://doc.rust-lang.org/nightly/core/iter/iterator/trait.Iterator.html" title="trait core::iter::iterator::Iterator">Iterator</a>&gt;::<a class="type" href="https://doc.rust-lang.org/nightly/core/iter/iterator/trait.Iterator.html#associatedtype.Item" title="type core::iter::iterator::Iterator::Item">Item</a>;</span></code></div></div><span id='state.v' class='invisible'><table class='table-display'><tbody><tr><td><code>pub fn <a href='#method.state' class='fnname'>state</a>(&amp;self) -&gt; <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&amp;</a>S</code></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/actix_web/application.rs.html#152-155' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><div class='docblock'><p>Get reference to the application state</p>
</div><h4 id='method.prefix' class="method"><span id='prefix.v' class='invisible'><table class='table-display'><tbody><tr><td><code>pub fn <a href='#method.prefix' class='fnname'>prefix</a>&lt;P:&nbsp;<a class="trait" href="https://doc.rust-lang.org/nightly/core/convert/trait.Into.html" title="trait core::convert::Into">Into</a>&lt;<a class="struct" href="https://doc.rust-lang.org/nightly/alloc/string/struct.String.html" title="struct alloc::string::String">String</a>&gt;&gt;(self, prefix: P) -&gt; <a class="struct" href="../actix_web/struct.App.html" title="struct actix_web::App">App</a>&lt;S&gt;</code></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/actix_web/application.rs.html#190-200' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><div class='docblock'><p>Set application prefix.</p>
<p>Only requests that match the application's prefix get
processed by this application.</p>
<p>The application prefix always contains a leading slash (<code>/</code>).
If the supplied prefix does not contain leading slash, it is
inserted.</p>
<p>Prefix should consist of valid path segments. i.e for an
application with the prefix <code>/app</code> any request with the paths
<code>/app</code>, <code>/app/</code> or <code>/app/test</code> would match, but the path
<code>/application</code> would not.</p>
<p>In the following example only requests with an <code>/app/</code> path
prefix get handled. Requests with path <code>/app/test/</code> would be
handled, while requests with the paths <code>/application</code> or
<code>/other/...</code> would return <code>NOT FOUND</code>.</p>
<pre class="rust rust-example-rendered">
<span class="kw">use</span> <span class="ident">actix_web</span>::{<span class="ident">http</span>, <span class="ident">App</span>, <span class="ident">HttpResponse</span>};
<span class="kw">fn</span> <span class="ident">main</span>() {
<span class="kw">let</span> <span class="ident">app</span> <span class="op">=</span> <span class="ident">App</span>::<span class="ident">new</span>()
.<span class="ident">prefix</span>(<span class="string">&quot;/app&quot;</span>)
.<span class="ident">resource</span>(<span class="string">&quot;/test&quot;</span>, <span class="op">|</span><span class="ident">r</span><span class="op">|</span> {
<span class="ident">r</span>.<span class="ident">get</span>().<span class="ident">f</span>(<span class="op">|</span><span class="kw">_</span><span class="op">|</span> <span class="ident">HttpResponse</span>::<span class="prelude-val">Ok</span>());
<span class="ident">r</span>.<span class="ident">head</span>().<span class="ident">f</span>(<span class="op">|</span><span class="kw">_</span><span class="op">|</span> <span class="ident">HttpResponse</span>::<span class="ident">MethodNotAllowed</span>());
})
.<span class="ident">finish</span>();
}</pre>
</div><h4 id='method.filter' class="method"><span id='filter.v' class='invisible'><table class='table-display'><tbody><tr><td><code>pub fn <a href='#method.filter' class='fnname'>filter</a>&lt;T:&nbsp;<a class="trait" href="../actix_web/pred/trait.Predicate.html" title="trait actix_web::pred::Predicate">Predicate</a>&lt;S&gt; + 'static&gt;(self, p: T) -&gt; <a class="struct" href="../actix_web/struct.App.html" title="struct actix_web::App">App</a>&lt;S&gt;</code></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/actix_web/application.rs.html#214-220' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><div class='docblock'><p>Add match predicate to application.</p>
<pre class="rust rust-example-rendered">
<span class="ident">App</span>::<span class="ident">new</span>()
.<span class="ident">filter</span>(<span class="ident">pred</span>::<span class="ident">Host</span>(<span class="string">&quot;www.rust-lang.org&quot;</span>))
.<span class="ident">resource</span>(<span class="string">&quot;/path&quot;</span>, <span class="op">|</span><span class="ident">r</span><span class="op">|</span> <span class="ident">r</span>.<span class="ident">f</span>(<span class="op">|</span><span class="kw">_</span><span class="op">|</span> <span class="ident">HttpResponse</span>::<span class="prelude-val">Ok</span>()))</pre>
</div><h4 id='method.route' class="method"><span id='route.v' class='invisible'><table class='table-display'><tbody><tr><td><code>pub fn <a href='#method.route' class='fnname'>route</a>&lt;T, F, R&gt;(self, path: &amp;<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.str.html">str</a>, method: <a class="struct" href="../actix_web/http/struct.Method.html" title="struct actix_web::http::Method">Method</a>, f: F) -&gt; <a class="struct" href="../actix_web/struct.App.html" title="struct actix_web::App">App</a>&lt;S&gt; <span class="where fmt-newline">where<br>&nbsp;&nbsp;&nbsp;&nbsp;F: <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/function/trait.Fn.html" title="trait core::ops::function::Fn">Fn</a>(T) -&gt; R + 'static,<br>&nbsp;&nbsp;&nbsp;&nbsp;R: <a class="trait" href="../actix_web/trait.Responder.html" title="trait actix_web::Responder">Responder</a> + 'static,<br>&nbsp;&nbsp;&nbsp;&nbsp;T: <a class="trait" href="../actix_web/trait.FromRequest.html" title="trait actix_web::FromRequest">FromRequest</a>&lt;S&gt; + 'static,&nbsp;</span></code></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/actix_web/application.rs.html#245-258' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><div class='docblock'><p>Configure route for a specific path.</p>
<p>This is a simplified version of the <code>App::resource()</code> method.
Handler functions need to accept one request extractor
argument.</p>
<p>This method could be called multiple times, in that case
multiple routes would be registered for same resource path.</p>
<pre class="rust rust-example-rendered">
<span class="kw">use</span> <span class="ident">actix_web</span>::{<span class="ident">http</span>, <span class="ident">App</span>, <span class="ident">HttpRequest</span>, <span class="ident">HttpResponse</span>};
<span class="kw">fn</span> <span class="ident">main</span>() {
<span class="kw">let</span> <span class="ident">app</span> <span class="op">=</span> <span class="ident">App</span>::<span class="ident">new</span>()
.<span class="ident">route</span>(<span class="string">&quot;/test&quot;</span>, <span class="ident">http</span>::<span class="ident">Method</span>::<span class="ident">GET</span>, <span class="op">|</span><span class="kw">_</span>: <span class="ident">HttpRequest</span><span class="op">|</span> {
<span class="ident">HttpResponse</span>::<span class="prelude-val">Ok</span>()
})
.<span class="ident">route</span>(<span class="string">&quot;/test&quot;</span>, <span class="ident">http</span>::<span class="ident">Method</span>::<span class="ident">POST</span>, <span class="op">|</span><span class="kw">_</span>: <span class="ident">HttpRequest</span><span class="op">|</span> {
<span class="ident">HttpResponse</span>::<span class="ident">MethodNotAllowed</span>()
});
}</pre>
</div><h4 id='method.scope' class="method"><span id='scope.v' class='invisible'><table class='table-display'><tbody><tr><td><code>pub fn <a href='#method.scope' class='fnname'>scope</a>&lt;F&gt;(self, path: &amp;<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.str.html">str</a>, f: F) -&gt; <a class="struct" href="../actix_web/struct.App.html" title="struct actix_web::App">App</a>&lt;S&gt; <span class="where fmt-newline">where<br>&nbsp;&nbsp;&nbsp;&nbsp;F: <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/function/trait.FnOnce.html" title="trait core::ops::function::FnOnce">FnOnce</a>(<a class="struct" href="../actix_web/struct.Scope.html" title="struct actix_web::Scope">Scope</a>&lt;S&gt;) -&gt; <a class="struct" href="../actix_web/struct.Scope.html" title="struct actix_web::Scope">Scope</a>&lt;S&gt;,&nbsp;</span></code></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/actix_web/application.rs.html#284-295' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><div class='docblock'><p>Configure scope for common root path.</p>
<p>Scopes collect multiple paths under a common path prefix.
Scope path can contain variable path segments as resources.</p>
<pre class="rust rust-example-rendered">
<span class="kw">use</span> <span class="ident">actix_web</span>::{<span class="ident">http</span>, <span class="ident">App</span>, <span class="ident">HttpRequest</span>, <span class="ident">HttpResponse</span>};
<span class="kw">fn</span> <span class="ident">main</span>() {
<span class="kw">let</span> <span class="ident">app</span> <span class="op">=</span> <span class="ident">App</span>::<span class="ident">new</span>().<span class="ident">scope</span>(<span class="string">&quot;/{project_id}&quot;</span>, <span class="op">|</span><span class="ident">scope</span><span class="op">|</span> {
<span class="ident">scope</span>
.<span class="ident">resource</span>(<span class="string">&quot;/path1&quot;</span>, <span class="op">|</span><span class="ident">r</span><span class="op">|</span> <span class="ident">r</span>.<span class="ident">f</span>(<span class="op">|</span><span class="kw">_</span><span class="op">|</span> <span class="ident">HttpResponse</span>::<span class="prelude-val">Ok</span>()))
.<span class="ident">resource</span>(<span class="string">&quot;/path2&quot;</span>, <span class="op">|</span><span class="ident">r</span><span class="op">|</span> <span class="ident">r</span>.<span class="ident">f</span>(<span class="op">|</span><span class="kw">_</span><span class="op">|</span> <span class="ident">HttpResponse</span>::<span class="prelude-val">Ok</span>()))
.<span class="ident">resource</span>(<span class="string">&quot;/path3&quot;</span>, <span class="op">|</span><span class="ident">r</span><span class="op">|</span> <span class="ident">r</span>.<span class="ident">f</span>(<span class="op">|</span><span class="kw">_</span><span class="op">|</span> <span class="ident">HttpResponse</span>::<span class="ident">MethodNotAllowed</span>()))
});
}</pre>
<p>In the above example, three routes get added:</p>
<ul>
<li>/{project_id}/path1</li>
<li>/{project_id}/path2</li>
<li>/{project_id}/path3</li>
</ul>
</div><h4 id='method.resource' class="method"><span id='resource.v' class='invisible'><table class='table-display'><tbody><tr><td><code>pub fn <a href='#method.resource' class='fnname'>resource</a>&lt;F, R&gt;(self, path: &amp;<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.str.html">str</a>, f: F) -&gt; <a class="struct" href="../actix_web/struct.App.html" title="struct actix_web::App">App</a>&lt;S&gt; <span class="where fmt-newline">where<br>&nbsp;&nbsp;&nbsp;&nbsp;F: <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/function/trait.FnOnce.html" title="trait core::ops::function::FnOnce">FnOnce</a>(&amp;mut <a class="struct" href="../actix_web/dev/struct.Resource.html" title="struct actix_web::dev::Resource">Resource</a>&lt;S&gt;) -&gt; R + 'static,&nbsp;</span></code></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/actix_web/application.rs.html#328-344' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><div class='docblock'><p>Configure resource for a specific path.</p>
<p>Resources may have variable path segments. For example, a
resource with the path <code>/a/{name}/c</code> would match all incoming
requests with paths such as <code>/a/b/c</code>, <code>/a/1/c</code>, or <code>/a/etc/c</code>.</p>
<p>A variable segment is specified in the form <code>{identifier}</code>,
where the identifier can be used later in a request handler to
access the matched value for that segment. This is done by
looking up the identifier in the <code>Params</code> object returned by
<code>HttpRequest.match_info()</code> method.</p>
<p>By default, each segment matches the regular expression <code>[^{}/]+</code>.</p>
<p>You can also specify a custom regex in the form <code>{identifier:regex}</code>:</p>
<p>For instance, to route <code>GET</code>-requests on any route matching
<code>/users/{userid}/{friend}</code> and store <code>userid</code> and <code>friend</code> in
the exposed <code>Params</code> object:</p>
<pre class="rust rust-example-rendered">
<span class="kw">use</span> <span class="ident">actix_web</span>::{<span class="ident">http</span>, <span class="ident">App</span>, <span class="ident">HttpResponse</span>};
<span class="kw">fn</span> <span class="ident">main</span>() {
<span class="kw">let</span> <span class="ident">app</span> <span class="op">=</span> <span class="ident">App</span>::<span class="ident">new</span>().<span class="ident">resource</span>(<span class="string">&quot;/users/{userid}/{friend}&quot;</span>, <span class="op">|</span><span class="ident">r</span><span class="op">|</span> {
<span class="ident">r</span>.<span class="ident">get</span>().<span class="ident">f</span>(<span class="op">|</span><span class="kw">_</span><span class="op">|</span> <span class="ident">HttpResponse</span>::<span class="prelude-val">Ok</span>());
<span class="ident">r</span>.<span class="ident">head</span>().<span class="ident">f</span>(<span class="op">|</span><span class="kw">_</span><span class="op">|</span> <span class="ident">HttpResponse</span>::<span class="ident">MethodNotAllowed</span>());
});
}</pre>
</div><h4 id='method.default_resource' class="method"><span id='default_resource.v' class='invisible'><table class='table-display'><tbody><tr><td><code>pub fn <a href='#method.default_resource' class='fnname'>default_resource</a>&lt;F, R&gt;(self, f: F) -&gt; <a class="struct" href="../actix_web/struct.App.html" title="struct actix_web::App">App</a>&lt;S&gt; <span class="where fmt-newline">where<br>&nbsp;&nbsp;&nbsp;&nbsp;F: <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/function/trait.FnOnce.html" title="trait core::ops::function::FnOnce">FnOnce</a>(&amp;mut <a class="struct" href="../actix_web/dev/struct.Resource.html" title="struct actix_web::dev::Resource">Resource</a>&lt;S&gt;) -&gt; R + 'static,&nbsp;</span></code></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/actix_web/application.rs.html#357-372' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><div class='docblock'><p>Default resource to be used if no matching route could be found.</p>
</div><h4 id='method.default_encoding' class="method"><span id='default_encoding.v' class='invisible'><table class='table-display'><tbody><tr><td><code>pub fn <a href='#method.default_encoding' class='fnname'>default_encoding</a>(self, encoding: <a class="enum" href="../actix_web/http/enum.ContentEncoding.html" title="enum actix_web::http::ContentEncoding">ContentEncoding</a>) -&gt; <a class="struct" href="../actix_web/struct.App.html" title="struct actix_web::App">App</a>&lt;S&gt;</code></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/actix_web/application.rs.html#375-381' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><div class='docblock'><p>Set default content encoding. <code>ContentEncoding::Auto</code> is set by default.</p>
</div><h4 id='method.external_resource' class="method"><span id='external_resource.v' class='invisible'><table class='table-display'><tbody><tr><td><code>pub fn <a href='#method.external_resource' class='fnname'>external_resource</a>&lt;T, U&gt;(self, name: T, url: U) -&gt; <a class="struct" href="../actix_web/struct.App.html" title="struct actix_web::App">App</a>&lt;S&gt; <span class="where fmt-newline">where<br>&nbsp;&nbsp;&nbsp;&nbsp;T: <a class="trait" href="https://doc.rust-lang.org/nightly/core/convert/trait.AsRef.html" title="trait core::convert::AsRef">AsRef</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.str.html">str</a>&gt;,<br>&nbsp;&nbsp;&nbsp;&nbsp;U: <a class="trait" href="https://doc.rust-lang.org/nightly/core/convert/trait.AsRef.html" title="trait core::convert::AsRef">AsRef</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.str.html">str</a>&gt;,&nbsp;</span></code></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/actix_web/application.rs.html#406-417' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><div class='docblock'><p>Register an external resource.</p>
<p>External resources are useful for URL generation purposes only
and are never considered for matching at request time. Calls to
<code>HttpRequest::url_for()</code> will work as expected.</p>
<pre class="rust rust-example-rendered">
<span class="kw">use</span> <span class="ident">actix_web</span>::{<span class="ident">App</span>, <span class="ident">HttpRequest</span>, <span class="ident">HttpResponse</span>, <span class="prelude-ty">Result</span>};
<span class="kw">fn</span> <span class="ident">index</span>(<span class="ident">req</span>: <span class="kw-2">&amp;</span><span class="ident">HttpRequest</span>) <span class="op">-&gt;</span> <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident">HttpResponse</span><span class="op">&gt;</span> {
<span class="kw">let</span> <span class="ident">url</span> <span class="op">=</span> <span class="ident">req</span>.<span class="ident">url_for</span>(<span class="string">&quot;youtube&quot;</span>, <span class="kw-2">&amp;</span>[<span class="string">&quot;oHg5SJYRHA0&quot;</span>])<span class="question-mark">?</span>;
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">url</span>.<span class="ident">as_str</span>(), <span class="string">&quot;https://youtube.com/watch/oHg5SJYRHA0&quot;</span>);
<span class="prelude-val">Ok</span>(<span class="ident">HttpResponse</span>::<span class="prelude-val">Ok</span>().<span class="ident">into</span>())
}
<span class="kw">fn</span> <span class="ident">main</span>() {
<span class="kw">let</span> <span class="ident">app</span> <span class="op">=</span> <span class="ident">App</span>::<span class="ident">new</span>()
.<span class="ident">resource</span>(<span class="string">&quot;/index.html&quot;</span>, <span class="op">|</span><span class="ident">r</span><span class="op">|</span> <span class="ident">r</span>.<span class="ident">get</span>().<span class="ident">f</span>(<span class="ident">index</span>))
.<span class="ident">external_resource</span>(<span class="string">&quot;youtube&quot;</span>, <span class="string">&quot;https://youtube.com/watch/{video_id}&quot;</span>)
.<span class="ident">finish</span>();
}</pre>
</div><h4 id='method.handler' class="method"><span id='handler.v' class='invisible'><table class='table-display'><tbody><tr><td><code>pub fn <a href='#method.handler' class='fnname'>handler</a>&lt;H:&nbsp;<a class="trait" href="../actix_web/dev/trait.Handler.html" title="trait actix_web::dev::Handler">Handler</a>&lt;S&gt;&gt;(self, path: &amp;<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.str.html">str</a>, handler: H) -&gt; <a class="struct" href="../actix_web/struct.App.html" title="struct actix_web::App">App</a>&lt;S&gt;</code></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/actix_web/application.rs.html#440-456' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><div class='docblock'><p>Configure handler for specific path prefix.</p>
<p>A path prefix consists of valid path segments, i.e for the
prefix <code>/app</code> any request with the paths <code>/app</code>, <code>/app/</code> or
<code>/app/test</code> would match, but the path <code>/application</code> would
not.</p>
<p>Path tail is available as <code>tail</code> parameter in request's match_dict.</p>
<pre class="rust rust-example-rendered">
<span class="kw">use</span> <span class="ident">actix_web</span>::{<span class="ident">http</span>, <span class="ident">App</span>, <span class="ident">HttpRequest</span>, <span class="ident">HttpResponse</span>};
<span class="kw">fn</span> <span class="ident">main</span>() {
<span class="kw">let</span> <span class="ident">app</span> <span class="op">=</span> <span class="ident">App</span>::<span class="ident">new</span>().<span class="ident">handler</span>(<span class="string">&quot;/app&quot;</span>, <span class="op">|</span><span class="ident">req</span>: <span class="kw-2">&amp;</span><span class="ident">HttpRequest</span><span class="op">|</span> <span class="kw">match</span> <span class="kw-2">*</span><span class="ident">req</span>.<span class="ident">method</span>() {
<span class="ident">http</span>::<span class="ident">Method</span>::<span class="ident">GET</span> <span class="op">=&gt;</span> <span class="ident">HttpResponse</span>::<span class="prelude-val">Ok</span>(),
<span class="ident">http</span>::<span class="ident">Method</span>::<span class="ident">POST</span> <span class="op">=&gt;</span> <span class="ident">HttpResponse</span>::<span class="ident">MethodNotAllowed</span>(),
<span class="kw">_</span> <span class="op">=&gt;</span> <span class="ident">HttpResponse</span>::<span class="ident">NotFound</span>(),
});
}</pre>
</div><h4 id='method.middleware' class="method"><span id='middleware.v' class='invisible'><table class='table-display'><tbody><tr><td><code>pub fn <a href='#method.middleware' class='fnname'>middleware</a>&lt;M:&nbsp;<a class="trait" href="../actix_web/middleware/trait.Middleware.html" title="trait actix_web::middleware::Middleware">Middleware</a>&lt;S&gt;&gt;(self, mw: M) -&gt; <a class="struct" href="../actix_web/struct.App.html" title="struct actix_web::App">App</a>&lt;S&gt;</code></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/actix_web/application.rs.html#459-466' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><div class='docblock'><p>Register a middleware.</p>
</div><h4 id='method.configure' class="method"><span id='configure.v' class='invisible'><table class='table-display'><tbody><tr><td><code>pub fn <a href='#method.configure' class='fnname'>configure</a>&lt;F&gt;(self, cfg: F) -&gt; <a class="struct" href="../actix_web/struct.App.html" title="struct actix_web::App">App</a>&lt;S&gt; <span class="where fmt-newline">where<br>&nbsp;&nbsp;&nbsp;&nbsp;F: <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/function/trait.Fn.html" title="trait core::ops::function::Fn">Fn</a>(<a class="struct" href="../actix_web/struct.App.html" title="struct actix_web::App">App</a>&lt;S&gt;) -&gt; <a class="struct" href="../actix_web/struct.App.html" title="struct actix_web::App">App</a>&lt;S&gt;,&nbsp;</span></code></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/actix_web/application.rs.html#494-499' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><div class='docblock'><p>Run external configuration as part of the application building
process</p>
<p>This function is useful for moving parts of configuration to a
different module or event library. For example we can move
some of the resources' configuration to different module.</p>
<pre class="rust rust-example-rendered">
<span class="kw">use</span> <span class="ident">actix_web</span>::{<span class="ident">fs</span>, <span class="ident">middleware</span>, <span class="ident">App</span>, <span class="ident">HttpResponse</span>};
<span class="comment">// this function could be located in different module</span>
<span class="kw">fn</span> <span class="ident">config</span>(<span class="ident">app</span>: <span class="ident">App</span>) <span class="op">-&gt;</span> <span class="ident">App</span> {
<span class="ident">app</span>.<span class="ident">resource</span>(<span class="string">&quot;/test&quot;</span>, <span class="op">|</span><span class="ident">r</span><span class="op">|</span> {
<span class="ident">r</span>.<span class="ident">get</span>().<span class="ident">f</span>(<span class="op">|</span><span class="kw">_</span><span class="op">|</span> <span class="ident">HttpResponse</span>::<span class="prelude-val">Ok</span>());
<span class="ident">r</span>.<span class="ident">head</span>().<span class="ident">f</span>(<span class="op">|</span><span class="kw">_</span><span class="op">|</span> <span class="ident">HttpResponse</span>::<span class="ident">MethodNotAllowed</span>());
})
}
<span class="kw">fn</span> <span class="ident">main</span>() {
<span class="kw">let</span> <span class="ident">app</span> <span class="op">=</span> <span class="ident">App</span>::<span class="ident">new</span>()
.<span class="ident">middleware</span>(<span class="ident">middleware</span>::<span class="ident">Logger</span>::<span class="ident">default</span>())
.<span class="ident">configure</span>(<span class="ident">config</span>) <span class="comment">// &lt;- register resources</span>
.<span class="ident">handler</span>(<span class="string">&quot;/static&quot;</span>, <span class="ident">fs</span>::<span class="ident">StaticFiles</span>::<span class="ident">new</span>(<span class="string">&quot;.&quot;</span>).<span class="ident">unwrap</span>());
}</pre>
</div><h4 id='method.finish' class="method"><span id='finish.v' class='invisible'><table class='table-display'><tbody><tr><td><code>pub fn <a href='#method.finish' class='fnname'>finish</a>(&amp;mut self) -&gt; HttpApplication&lt;S&gt;</code></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/actix_web/application.rs.html#502-525' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><div class='docblock'><p>Finish application configuration and create <code>HttpHandler</code> object.</p>
</div><h4 id='method.boxed' class="method"><div class="important-traits"><div class='tooltip'><span class='tooltiptext'>Important traits for <a class="struct" href="https://doc.rust-lang.org/nightly/alloc/boxed/struct.Box.html" title="struct alloc::boxed::Box">Box</a>&lt;R&gt;</span></div><div class="content hidden"><h3 class="important">Important traits for <a class="struct" href="https://doc.rust-lang.org/nightly/alloc/boxed/struct.Box.html" title="struct alloc::boxed::Box">Box</a>&lt;R&gt;</h3><code class="content"><span class="where fmt-newline">impl&lt;R&gt; <a class="trait" href="https://doc.rust-lang.org/nightly/std/io/trait.Read.html" title="trait std::io::Read">Read</a> for <a class="struct" href="https://doc.rust-lang.org/nightly/alloc/boxed/struct.Box.html" title="struct alloc::boxed::Box">Box</a>&lt;R&gt; <span class="where fmt-newline">where<br>&nbsp;&nbsp;&nbsp;&nbsp;R: <a class="trait" href="https://doc.rust-lang.org/nightly/std/io/trait.Read.html" title="trait std::io::Read">Read</a> + ?<a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,&nbsp;</span></span><span class="where fmt-newline">impl&lt;W&gt; <a class="trait" href="https://doc.rust-lang.org/nightly/std/io/trait.Write.html" title="trait std::io::Write">Write</a> for <a class="struct" href="https://doc.rust-lang.org/nightly/alloc/boxed/struct.Box.html" title="struct alloc::boxed::Box">Box</a>&lt;W&gt; <span class="where fmt-newline">where<br>&nbsp;&nbsp;&nbsp;&nbsp;W: <a class="trait" href="https://doc.rust-lang.org/nightly/std/io/trait.Write.html" title="trait std::io::Write">Write</a> + ?<a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,&nbsp;</span></span><span class="where fmt-newline">impl&lt;I&gt; <a class="trait" href="https://doc.rust-lang.org/nightly/core/iter/iterator/trait.Iterator.html" title="trait core::iter::iterator::Iterator">Iterator</a> for <a class="struct" href="https://doc.rust-lang.org/nightly/alloc/boxed/struct.Box.html" title="struct alloc::boxed::Box">Box</a>&lt;I&gt; <span class="where fmt-newline">where<br>&nbsp;&nbsp;&nbsp;&nbsp;I: <a class="trait" href="https://doc.rust-lang.org/nightly/core/iter/iterator/trait.Iterator.html" title="trait core::iter::iterator::Iterator">Iterator</a> + ?<a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,&nbsp;</span></span><span class="where fmt-newline"> type <a href='https://doc.rust-lang.org/nightly/core/iter/iterator/trait.Iterator.html#associatedtype.Item' class="type">Item</a> = &lt;I as <a class="trait" href="https://doc.rust-lang.org/nightly/core/iter/iterator/trait.Iterator.html" title="trait core::iter::iterator::Iterator">Iterator</a>&gt;::<a class="type" href="https://doc.rust-lang.org/nightly/core/iter/iterator/trait.Iterator.html#associatedtype.Item" title="type core::iter::iterator::Iterator::Item">Item</a>;</span></code></div></div><span id='boxed.v' class='invisible'><table class='table-display'><tbody><tr><td><code>pub fn <a href='#method.boxed' class='fnname'>boxed</a>(self) -&gt; <a class="struct" href="https://doc.rust-lang.org/nightly/alloc/boxed/struct.Box.html" title="struct alloc::boxed::Box">Box</a>&lt;<a class="trait" href="../actix_web/server/trait.HttpHandler.html" title="trait actix_web::server::HttpHandler">HttpHandler</a>&lt;Task = <a class="struct" href="https://doc.rust-lang.org/nightly/alloc/boxed/struct.Box.html" title="struct alloc::boxed::Box">Box</a>&lt;<a class="trait" href="../actix_web/server/trait.HttpHandlerTask.html" title="trait actix_web::server::HttpHandlerTask">HttpHandlerTask</a>&gt;&gt;&gt;</code></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/actix_web/application.rs.html#560-562' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><div class='docblock'><p>Convenience method for creating <code>Box&lt;HttpHandler&gt;</code> instances.</p>
<p>This method is useful if you need to register multiple
application instances with different state.</p>
<pre class="rust rust-example-rendered">
<span class="kw">use</span> <span class="ident">actix_web</span>::{<span class="ident">server</span>, <span class="ident">App</span>, <span class="ident">HttpResponse</span>};
<span class="kw">struct</span> <span class="ident">State1</span>;
<span class="kw">struct</span> <span class="ident">State2</span>;
<span class="kw">fn</span> <span class="ident">main</span>() {
<span class="ident">server</span>::<span class="ident">new</span>(<span class="op">||</span> {
<span class="macro">vec</span><span class="macro">!</span>[
<span class="ident">App</span>::<span class="ident">with_state</span>(<span class="ident">State1</span>)
.<span class="ident">prefix</span>(<span class="string">&quot;/app1&quot;</span>)
.<span class="ident">resource</span>(<span class="string">&quot;/&quot;</span>, <span class="op">|</span><span class="ident">r</span><span class="op">|</span> <span class="ident">r</span>.<span class="ident">f</span>(<span class="op">|</span><span class="ident">r</span><span class="op">|</span> <span class="ident">HttpResponse</span>::<span class="prelude-val">Ok</span>()))
.<span class="ident">boxed</span>(),
<span class="ident">App</span>::<span class="ident">with_state</span>(<span class="ident">State2</span>)
.<span class="ident">prefix</span>(<span class="string">&quot;/app2&quot;</span>)
.<span class="ident">resource</span>(<span class="string">&quot;/&quot;</span>, <span class="op">|</span><span class="ident">r</span><span class="op">|</span> <span class="ident">r</span>.<span class="ident">f</span>(<span class="op">|</span><span class="ident">r</span><span class="op">|</span> <span class="ident">HttpResponse</span>::<span class="prelude-val">Ok</span>()))
.<span class="ident">boxed</span>(),
]
}).<span class="ident">bind</span>(<span class="string">&quot;127.0.0.1:8080&quot;</span>)
.<span class="ident">unwrap</span>()
.<span class="ident">run</span>()
}</pre>
</div></div>
<h2 id='implementations' class='small-section-header'>
Trait Implementations<a href='#implementations' class='anchor'></a>
</h2>
<div id='implementations-list'><h3 id='impl-Default' class='impl'><span class='in-band'><table class='table-display'><tbody><tr><td><code>impl <a class="trait" href="https://doc.rust-lang.org/nightly/core/default/trait.Default.html" title="trait core::default::Default">Default</a> for <a class="struct" href="../actix_web/struct.App.html" title="struct actix_web::App">App</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.unit.html">()</a>&gt;</code><a href='#impl-Default' class='anchor'></a></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/actix_web/application.rs.html#116-120' title='goto source code'>[src]</a></span></td></tr></tbody></table></h3><div class='impl-items'><h4 id='method.default' class="method"><span id='default.v' class='invisible'><table class='table-display'><tbody><tr><td><code>fn <a href='https://doc.rust-lang.org/nightly/core/default/trait.Default.html#tymethod.default' class='fnname'>default</a>() -&gt; Self</code></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/actix_web/application.rs.html#117-119' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><div class='docblock'><p>Returns the &quot;default value&quot; for a type. <a href="https://doc.rust-lang.org/nightly/core/default/trait.Default.html#tymethod.default">Read more</a></p>
</div></div><h3 id='impl-IntoHttpHandler' class='impl'><span class='in-band'><table class='table-display'><tbody><tr><td><code>impl&lt;S:&nbsp;'static&gt; <a class="trait" href="../actix_web/server/trait.IntoHttpHandler.html" title="trait actix_web::server::IntoHttpHandler">IntoHttpHandler</a> for <a class="struct" href="../actix_web/struct.App.html" title="struct actix_web::App">App</a>&lt;S&gt;</code><a href='#impl-IntoHttpHandler' class='anchor'></a></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/actix_web/application.rs.html#580-586' title='goto source code'>[src]</a></span></td></tr></tbody></table></h3><div class='impl-items'><h4 id='associatedtype.Handler' class="type"><span id='Handler.t' class='invisible'><code>type <a href='../actix_web/server/trait.IntoHttpHandler.html#associatedtype.Handler' class="type">Handler</a> = HttpApplication&lt;S&gt;</code></span></h4>
<div class='docblock'><p>The associated type which is result of conversion.</p>
</div><h4 id='method.into_handler' class="method"><span id='into_handler.v' class='invisible'><table class='table-display'><tbody><tr><td><code>fn <a href='../actix_web/server/trait.IntoHttpHandler.html#tymethod.into_handler' class='fnname'>into_handler</a>(self) -&gt; HttpApplication&lt;S&gt;</code></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/actix_web/application.rs.html#583-585' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><div class='docblock'><p>Convert into <code>HttpHandler</code> object.</p>
</div></div><h3 id='impl-IntoHttpHandler-1' class='impl'><span class='in-band'><table class='table-display'><tbody><tr><td><code>impl&lt;'a, S:&nbsp;'static&gt; <a class="trait" href="../actix_web/server/trait.IntoHttpHandler.html" title="trait actix_web::server::IntoHttpHandler">IntoHttpHandler</a> for &amp;'a mut <a class="struct" href="../actix_web/struct.App.html" title="struct actix_web::App">App</a>&lt;S&gt;</code><a href='#impl-IntoHttpHandler-1' class='anchor'></a></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/actix_web/application.rs.html#588-594' title='goto source code'>[src]</a></span></td></tr></tbody></table></h3><div class='impl-items'><h4 id='associatedtype.Handler-1' class="type"><span id='Handler.t-1' class='invisible'><code>type <a href='../actix_web/server/trait.IntoHttpHandler.html#associatedtype.Handler' class="type">Handler</a> = HttpApplication&lt;S&gt;</code></span></h4>
<div class='docblock'><p>The associated type which is result of conversion.</p>
</div><h4 id='method.into_handler-1' class="method"><span id='into_handler.v-1' class='invisible'><table class='table-display'><tbody><tr><td><code>fn <a href='../actix_web/server/trait.IntoHttpHandler.html#tymethod.into_handler' class='fnname'>into_handler</a>(self) -&gt; HttpApplication&lt;S&gt;</code></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/actix_web/application.rs.html#591-593' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><div class='docblock'><p>Convert into <code>HttpHandler</code> object.</p>
</div></div></div>
<h2 id='synthetic-implementations' class='small-section-header'>
Auto Trait Implementations<a href='#synthetic-implementations' class='anchor'></a>
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<div id='synthetic-implementations-list'>
<h3 id='impl-Send' class='impl'><span class='in-band'><table class='table-display'><tbody><tr><td><code>impl&lt;S&nbsp;=&nbsp;<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.unit.html">()</a>&gt; !<a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Send.html" title="trait core::marker::Send">Send</a> for <a class="struct" href="../actix_web/struct.App.html" title="struct actix_web::App">App</a>&lt;S&gt;</code><a href='#impl-Send' class='anchor'></a></span></td><td><span class='out-of-band'></span></td></tr></tbody></table></h3><div class='impl-items'></div><h3 id='impl-Sync' class='impl'><span class='in-band'><table class='table-display'><tbody><tr><td><code>impl&lt;S&nbsp;=&nbsp;<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.unit.html">()</a>&gt; !<a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Sync.html" title="trait core::marker::Sync">Sync</a> for <a class="struct" href="../actix_web/struct.App.html" title="struct actix_web::App">App</a>&lt;S&gt;</code><a href='#impl-Sync' class='anchor'></a></span></td><td><span class='out-of-band'></span></td></tr></tbody></table></h3><div class='impl-items'></div></div></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>&#9166;</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>