<!DOCTYPE html><htmllang="en"><head><metacharset="utf-8"><metaname="viewport"content="width=device-width, initial-scale=1.0"><metaname="generator"content="rustdoc"><metaname="description"content="API documentation for the Rust `VIA` constant in crate `actix_web`."><metaname="keywords"content="rust, rustlang, rust-lang, VIA"><title>actix_web::http::header::VIA - Rust</title><linkrel="stylesheet"type="text/css"href="../../../normalize.css"><linkrel="stylesheet"type="text/css"href="../../../rustdoc.css"id="mainThemeStyle"><linkrel="stylesheet"type="text/css"href="../../../dark.css"><linkrel="stylesheet"type="text/css"href="../../../light.css"id="themeStyle"><scriptsrc="../../../storage.js"></script></head><bodyclass="rustdoc constant"><!--[if lte IE 8]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><navclass="sidebar"><divclass="sidebar-menu">☰</div><divclass="sidebar-elems"><pclass='location'><ahref='../../index.html'>actix_web</a>::<wbr><ahref='../index.html'>http</a>::<wbr><ahref='index.html'>header</a></p><script>window.sidebarCurrent={name:'VIA',ty:'constant',relpath:''};</script><scriptdefersrc="sidebar-items.js"></script></div></nav><divclass="theme-picker"><buttonid="theme-picker"aria-label="Pick another theme!"><imgsrc="../../../brush.svg"width="18"alt="Pick another theme!"></button><divid="theme-choices"></div></div><scriptsrc="../../../theme.js"></script><navclass="sub"><formclass="search-form js-only"><divclass="search-container"><inputclass="search-input"name="search"autocomplete="off"placeholder="Click or press ‘S’ to search, ‘?’ for more options…"type="search"><aid="settings-menu"href="../../../settings.html"><imgsrc="../../../wheel.svg"width="18"alt="Change settings"></a></div></form></nav><sectionid="main"class="content"><h1class='fqn'><spanclass='out-of-band'><spanid='render-detail'><aid="toggle-all-docs"href="javascript:void(0)"title="collapse all docs">[<spanclass='inner'>−</span>]</a></span><aclass='srclink'href='https://docs.rs/http/0.1.13/src/http/header/name.rs.html#84-86'title='goto source code'>[src]</a></span><spanclass='in-band'>Constant <ahref='../../index.html'>actix_web</a>::<wbr><ahref='../index.html'>http</a>::<wbr><ahref='index.html'>header</a>::<wbr><aclass="constant"href=''>VIA</a></span></h1><preclass='rust const'>pub const VIA: <aclass="struct"href="../../../actix_web/http/header/struct.HeaderName.html"title="struct actix_web::http::header::HeaderName">HeaderName</a></pre><divclass='docblock'><p>Added by proxies to track routing.</p>
<p>The <code>via</code> general header is added by proxies, both forward and reverse
proxies, and can appear in the request headers and the response headers.
It is used for tracking message forwards, avoiding request loops, and
identifying the protocol capabilities of senders along the
request/response chain.</p>
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