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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 `Logger` struct in crate `actix_web`."><meta name="keywords" content="rust, rustlang, rust-lang, Logger"><title>actix_web::middleware::Logger - 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">☰</div><p class='location'>Struct Logger</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.exclude">exclude</a></div><a class="sidebar-title" href="#implementations">Trait Implementations</a><div class="sidebar-links"><a href="#impl-Default">Default</a><a href="#impl-Middleware%3CS%3E">Middleware<S></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>::<wbr><a href='index.html'>middleware</a></p><script>window.sidebarCurrent = {name: 'Logger', 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 href='index.html'>middleware</a>::<wbr><a class="struct" href=''>Logger</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'>−</span>]</a></span><a class='srclink' href='../../src/actix_web/middleware/logger.rs.html#72-75' title='goto source code'>[src]</a></span></h1><div class="docblock type-decl"><pre class='rust struct'>pub struct Logger { /* fields omitted */ }</pre></div><div class='docblock'><p><code>Middleware</code> for logging request and response info to the terminal.</p>
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<p><code>Logger</code> middleware uses standard log crate to log information. You should
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enable logger for <code>actix_web</code> package to see access log.
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(<a href="https://docs.rs/env_logger/*/env_logger/"><code>env_logger</code></a> or similar)</p>
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<h2 id="usage" class="section-header"><a href="#usage">Usage</a></h2>
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<p>Create <code>Logger</code> middleware with the specified <code>format</code>.
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Default <code>Logger</code> could be created with <code>default</code> method, it uses the
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default format:</p>
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<div class='information'><div class='tooltip ignore'>ⓘ<span class='tooltiptext'>This example is not tested</span></div></div><pre class="rust rust-example-rendered ignore">
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<span class="op">%</span><span class="ident">a</span> <span class="op">%</span><span class="ident">t</span> <span class="string">"%r"</span> <span class="op">%</span><span class="ident">s</span> <span class="op">%</span><span class="ident">b</span> <span class="string">"%{Referer}i"</span> <span class="string">"%{User-Agent}i"</span> <span class="op">%</span><span class="ident">T</span></pre>
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<pre class="rust rust-example-rendered">
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<span class="kw">extern</span> <span class="kw">crate</span> <span class="ident">env_logger</span>;
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<span class="kw">use</span> <span class="ident">actix_web</span>::<span class="ident">middleware</span>::<span class="ident">Logger</span>;
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<span class="kw">use</span> <span class="ident">actix_web</span>::<span class="ident">App</span>;
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<span class="kw">fn</span> <span class="ident">main</span>() {
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<span class="ident">std</span>::<span class="ident">env</span>::<span class="ident">set_var</span>(<span class="string">"RUST_LOG"</span>, <span class="string">"actix_web=info"</span>);
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<span class="ident">env_logger</span>::<span class="ident">init</span>();
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<span class="kw">let</span> <span class="ident">app</span> <span class="op">=</span> <span class="ident">App</span>::<span class="ident">new</span>()
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.<span class="ident">middleware</span>(<span class="ident">Logger</span>::<span class="ident">default</span>())
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.<span class="ident">middleware</span>(<span class="ident">Logger</span>::<span class="ident">new</span>(<span class="string">"%a %{User-Agent}i"</span>))
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.<span class="ident">finish</span>();
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}</pre>
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<h2 id="format" class="section-header"><a href="#format">Format</a></h2>
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<p><code>%%</code> The percent sign</p>
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<p><code>%a</code> Remote IP-address (IP-address of proxy if using reverse proxy)</p>
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<p><code>%t</code> Time when the request was started to process</p>
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<p><code>%r</code> First line of request</p>
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<p><code>%s</code> Response status code</p>
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<p><code>%b</code> Size of response in bytes, including HTTP headers</p>
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<p><code>%T</code> Time taken to serve the request, in seconds with floating fraction in
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.06f format</p>
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<p><code>%D</code> Time taken to serve the request, in milliseconds</p>
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<p><code>%{FOO}i</code> request.headers['FOO']</p>
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<p><code>%{FOO}o</code> response.headers['FOO']</p>
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<p><code>%{FOO}e</code> os.environ['FOO']</p>
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</div>
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<h2 id='methods' class='small-section-header'>
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Methods<a href='#methods' class='anchor'></a>
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</h2>
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<h3 id='impl' class='impl'><span class='in-band'><table class='table-display'><tbody><tr><td><code>impl <a class="struct" href="../../actix_web/middleware/struct.Logger.html" title="struct actix_web::middleware::Logger">Logger</a></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/middleware/logger.rs.html#77-91' 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>(format: &<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.str.html">str</a>) -> <a class="struct" href="../../actix_web/middleware/struct.Logger.html" title="struct actix_web::middleware::Logger">Logger</a></code></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/actix_web/middleware/logger.rs.html#79-84' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><div class='docblock'><p>Create <code>Logger</code> middleware with the specified <code>format</code>.</p>
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</div><h4 id='method.exclude' class="method"><span id='exclude.v' class='invisible'><table class='table-display'><tbody><tr><td><code>pub fn <a href='#method.exclude' class='fnname'>exclude</a><T: <a class="trait" href="https://doc.rust-lang.org/nightly/core/convert/trait.Into.html" title="trait core::convert::Into">Into</a><<a class="struct" href="https://doc.rust-lang.org/nightly/alloc/string/struct.String.html" title="struct alloc::string::String">String</a>>>(self, path: T) -> Self</code></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/actix_web/middleware/logger.rs.html#87-90' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><div class='docblock'><p>Ignore and do not log access info for specified path.</p>
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</div></div>
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<h2 id='implementations' class='small-section-header'>
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Trait Implementations<a href='#implementations' class='anchor'></a>
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</h2>
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<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/middleware/struct.Logger.html" title="struct actix_web::middleware::Logger">Logger</a></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/middleware/logger.rs.html#93-105' 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>() -> <a class="struct" href="../../actix_web/middleware/struct.Logger.html" title="struct actix_web::middleware::Logger">Logger</a></code></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/actix_web/middleware/logger.rs.html#99-104' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><div class='docblock'><p>Create <code>Logger</code> middleware with format:</p>
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<div class='information'><div class='tooltip ignore'>ⓘ<span class='tooltiptext'>This example is not tested</span></div></div><pre class="rust rust-example-rendered ignore">
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<span class="op">%</span><span class="ident">a</span> <span class="op">%</span><span class="ident">t</span> <span class="string">"%r"</span> <span class="op">%</span><span class="ident">s</span> <span class="op">%</span><span class="ident">b</span> <span class="string">"%{Referer}i"</span> <span class="string">"%{User-Agent}i"</span> <span class="op">%</span><span class="ident">T</span></pre>
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</div></div><h3 id='impl-Middleware%3CS%3E' class='impl'><span class='in-band'><table class='table-display'><tbody><tr><td><code>impl<S> <a class="trait" href="../../actix_web/middleware/trait.Middleware.html" title="trait actix_web::middleware::Middleware">Middleware</a><S> for <a class="struct" href="../../actix_web/middleware/struct.Logger.html" title="struct actix_web::middleware::Logger">Logger</a></code><a href='#impl-Middleware%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/logger.rs.html#123-135' title='goto source code'>[src]</a></span></td></tr></tbody></table></h3><div class='impl-items'><h4 id='method.start' class="method"><span id='start.v' class='invisible'><table class='table-display'><tbody><tr><td><code>fn <a href='../../actix_web/middleware/trait.Middleware.html#method.start' class='fnname'>start</a>(&self, req: &<a class="struct" href="../../actix_web/struct.HttpRequest.html" title="struct actix_web::HttpRequest">HttpRequest</a><S>) -> <a class="type" href="../../actix_web/error/type.Result.html" title="type actix_web::error::Result">Result</a><<a class="enum" href="../../actix_web/middleware/enum.Started.html" title="enum actix_web::middleware::Started">Started</a>></code></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/actix_web/middleware/logger.rs.html#124-129' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><div class='docblock'><p>Method is called when request is ready. It may return future, which should resolve before next middleware get called. <a href="../../actix_web/middleware/trait.Middleware.html#method.start">Read more</a></p>
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</div><h4 id='method.finish' class="method"><span id='finish.v' class='invisible'><table class='table-display'><tbody><tr><td><code>fn <a href='../../actix_web/middleware/trait.Middleware.html#method.finish' class='fnname'>finish</a>(&self, req: &<a class="struct" href="../../actix_web/struct.HttpRequest.html" title="struct actix_web::HttpRequest">HttpRequest</a><S>, resp: &<a class="struct" href="../../actix_web/struct.HttpResponse.html" title="struct actix_web::HttpResponse">HttpResponse</a>) -> <a class="enum" href="../../actix_web/middleware/enum.Finished.html" title="enum actix_web::middleware::Finished">Finished</a></code></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/actix_web/middleware/logger.rs.html#131-134' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><div class='docblock'><p>Method is called after body stream get sent to peer.</p>
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</div><h4 id='method.response' class="method"><span id='response.v' class='invisible'><table class='table-display'><tbody><tr><td><code>fn <a href='../../actix_web/middleware/trait.Middleware.html#method.response' class='fnname'>response</a>(&self, req: &<a class="struct" href="../../actix_web/struct.HttpRequest.html" title="struct actix_web::HttpRequest">HttpRequest</a><S>, resp: <a class="struct" href="../../actix_web/struct.HttpResponse.html" title="struct actix_web::HttpResponse">HttpResponse</a>) -> <a class="type" href="../../actix_web/error/type.Result.html" title="type actix_web::error::Result">Result</a><<a class="enum" href="../../actix_web/middleware/enum.Response.html" title="enum actix_web::middleware::Response">Response</a>></code></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/actix_web/middleware/mod.rs.html#60-62' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><div class='docblock'><p>Method is called when handler returns response, but before sending http message to peer. <a href="../../actix_web/middleware/trait.Middleware.html#method.response">Read more</a></p>
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</div></div></div>
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<h2 id='synthetic-implementations' class='small-section-header'>
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Auto Trait Implementations<a href='#synthetic-implementations' class='anchor'></a>
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</h2>
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<div id='synthetic-implementations-list'>
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<h3 id='impl-Send' 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/marker/trait.Send.html" title="trait core::marker::Send">Send</a> for <a class="struct" href="../../actix_web/middleware/struct.Logger.html" title="struct actix_web::middleware::Logger">Logger</a></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 <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/middleware/struct.Logger.html" title="struct actix_web::middleware::Logger">Logger</a></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>⏎</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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