<!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="Source to the Rust file `src/middleware/defaultheaders.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>defaultheaders.rs.html -- source</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 source"><!--[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></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"><pre class="line-numbers"><span id="1"> 1</span> <span id="2"> 2</span> <span id="3"> 3</span> <span id="4"> 4</span> <span id="5"> 5</span> <span id="6"> 6</span> <span id="7"> 7</span> <span id="8"> 8</span> <span id="9"> 9</span> <span id="10"> 10</span> <span id="11"> 11</span> <span id="12"> 12</span> <span id="13"> 13</span> <span id="14"> 14</span> <span id="15"> 15</span> <span id="16"> 16</span> <span id="17"> 17</span> <span id="18"> 18</span> <span id="19"> 19</span> <span id="20"> 20</span> <span id="21"> 21</span> <span id="22"> 22</span> <span id="23"> 23</span> <span id="24"> 24</span> <span id="25"> 25</span> <span id="26"> 26</span> <span id="27"> 27</span> <span id="28"> 28</span> <span id="29"> 29</span> <span id="30"> 30</span> <span id="31"> 31</span> <span id="32"> 32</span> <span id="33"> 33</span> <span id="34"> 34</span> <span id="35"> 35</span> <span id="36"> 36</span> <span id="37"> 37</span> <span id="38"> 38</span> <span id="39"> 39</span> <span id="40"> 40</span> <span id="41"> 41</span> <span id="42"> 42</span> <span id="43"> 43</span> <span id="44"> 44</span> <span id="45"> 45</span> <span id="46"> 46</span> <span id="47"> 47</span> <span id="48"> 48</span> <span id="49"> 49</span> <span id="50"> 50</span> <span id="51"> 51</span> <span id="52"> 52</span> <span id="53"> 53</span> <span id="54"> 54</span> <span id="55"> 55</span> <span id="56"> 56</span> <span id="57"> 57</span> <span id="58"> 58</span> <span id="59"> 59</span> <span id="60"> 60</span> <span id="61"> 61</span> <span id="62"> 62</span> <span id="63"> 63</span> <span id="64"> 64</span> <span id="65"> 65</span> <span id="66"> 66</span> <span id="67"> 67</span> <span id="68"> 68</span> <span id="69"> 69</span> <span id="70"> 70</span> <span id="71"> 71</span> <span id="72"> 72</span> <span id="73"> 73</span> <span id="74"> 74</span> <span id="75"> 75</span> <span id="76"> 76</span> <span id="77"> 77</span> <span id="78"> 78</span> <span id="79"> 79</span> <span id="80"> 80</span> <span id="81"> 81</span> <span id="82"> 82</span> <span id="83"> 83</span> <span id="84"> 84</span> <span id="85"> 85</span> <span id="86"> 86</span> <span id="87"> 87</span> <span id="88"> 88</span> <span id="89"> 89</span> <span id="90"> 90</span> <span id="91"> 91</span> <span id="92"> 92</span> <span id="93"> 93</span> <span id="94"> 94</span> <span id="95"> 95</span> <span id="96"> 96</span> <span id="97"> 97</span> <span id="98"> 98</span> <span id="99"> 99</span> <span id="100">100</span> <span id="101">101</span> <span id="102">102</span> <span id="103">103</span> <span id="104">104</span> <span id="105">105</span> <span id="106">106</span> <span id="107">107</span> <span id="108">108</span> <span id="109">109</span> <span id="110">110</span> <span id="111">111</span> <span id="112">112</span> <span id="113">113</span> <span id="114">114</span> <span id="115">115</span> <span id="116">116</span> <span id="117">117</span> <span id="118">118</span> <span id="119">119</span> <span id="120">120</span> </pre><pre class="rust "> <span class="doccomment">//! Default response headers</span> <span class="kw">use</span> <span class="ident">http</span>::<span class="ident">header</span>::{<span class="ident">HeaderName</span>, <span class="ident">HeaderValue</span>, <span class="ident">CONTENT_TYPE</span>}; <span class="kw">use</span> <span class="ident">http</span>::{<span class="ident">HeaderMap</span>, <span class="ident">HttpTryFrom</span>}; <span class="kw">use</span> <span class="ident">error</span>::<span class="prelude-ty">Result</span>; <span class="kw">use</span> <span class="ident">httprequest</span>::<span class="ident">HttpRequest</span>; <span class="kw">use</span> <span class="ident">httpresponse</span>::<span class="ident">HttpResponse</span>; <span class="kw">use</span> <span class="ident">middleware</span>::{<span class="ident">Middleware</span>, <span class="ident">Response</span>}; <span class="doccomment">/// `Middleware` for setting default response headers.</span> <span class="doccomment">///</span> <span class="doccomment">/// This middleware does not set header if response headers already contains it.</span> <span class="doccomment">///</span> <span class="doccomment">/// ```rust</span> <span class="doccomment">/// # extern crate actix_web;</span> <span class="doccomment">/// use actix_web::{http, middleware, App, HttpResponse};</span> <span class="doccomment">///</span> <span class="doccomment">/// fn main() {</span> <span class="doccomment">/// let app = App::new()</span> <span class="doccomment">/// .middleware(middleware::DefaultHeaders::new().header("X-Version", "0.2"))</span> <span class="doccomment">/// .resource("/test", |r| {</span> <span class="doccomment">/// r.method(http::Method::GET).f(|_| HttpResponse::Ok());</span> <span class="doccomment">/// r.method(http::Method::HEAD)</span> <span class="doccomment">/// .f(|_| HttpResponse::MethodNotAllowed());</span> <span class="doccomment">/// })</span> <span class="doccomment">/// .finish();</span> <span class="doccomment">/// }</span> <span class="doccomment">/// ```</span> <span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">DefaultHeaders</span> { <span class="ident">ct</span>: <span class="ident">bool</span>, <span class="ident">headers</span>: <span class="ident">HeaderMap</span>, } <span class="kw">impl</span> <span class="ident">Default</span> <span class="kw">for</span> <span class="ident">DefaultHeaders</span> { <span class="kw">fn</span> <span class="ident">default</span>() <span class="op">-></span> <span class="self">Self</span> { <span class="ident">DefaultHeaders</span> { <span class="ident">ct</span>: <span class="bool-val">false</span>, <span class="ident">headers</span>: <span class="ident">HeaderMap</span>::<span class="ident">new</span>(), } } } <span class="kw">impl</span> <span class="ident">DefaultHeaders</span> { <span class="doccomment">/// Construct `DefaultHeaders` middleware.</span> <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">new</span>() <span class="op">-></span> <span class="ident">DefaultHeaders</span> { <span class="ident">DefaultHeaders</span>::<span class="ident">default</span>() } <span class="doccomment">/// Set a header.</span> <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="attribute">#[<span class="ident">cfg_attr</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"cargo-clippy"</span>, <span class="ident">allow</span>(<span class="ident">clippy</span>::<span class="ident">match_wild_err_arm</span>))]</span> <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">header</span><span class="op"><</span><span class="ident">K</span>, <span class="ident">V</span><span class="op">></span>(<span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">key</span>: <span class="ident">K</span>, <span class="ident">value</span>: <span class="ident">V</span>) <span class="op">-></span> <span class="self">Self</span> <span class="kw">where</span> <span class="ident">HeaderName</span>: <span class="ident">HttpTryFrom</span><span class="op"><</span><span class="ident">K</span><span class="op">></span>, <span class="ident">HeaderValue</span>: <span class="ident">HttpTryFrom</span><span class="op"><</span><span class="ident">V</span><span class="op">></span>, { <span class="kw">match</span> <span class="ident">HeaderName</span>::<span class="ident">try_from</span>(<span class="ident">key</span>) { <span class="prelude-val">Ok</span>(<span class="ident">key</span>) <span class="op">=></span> <span class="kw">match</span> <span class="ident">HeaderValue</span>::<span class="ident">try_from</span>(<span class="ident">value</span>) { <span class="prelude-val">Ok</span>(<span class="ident">value</span>) <span class="op">=></span> { <span class="self">self</span>.<span class="ident">headers</span>.<span class="ident">append</span>(<span class="ident">key</span>, <span class="ident">value</span>); } <span class="prelude-val">Err</span>(<span class="kw">_</span>) <span class="op">=></span> <span class="macro">panic</span><span class="macro">!</span>(<span class="string">"Can not create header value"</span>), }, <span class="prelude-val">Err</span>(<span class="kw">_</span>) <span class="op">=></span> <span class="macro">panic</span><span class="macro">!</span>(<span class="string">"Can not create header name"</span>), } <span class="self">self</span> } <span class="doccomment">/// Set *CONTENT-TYPE* header if response does not contain this header.</span> <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">content_type</span>(<span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-></span> <span class="self">Self</span> { <span class="self">self</span>.<span class="ident">ct</span> <span class="op">=</span> <span class="bool-val">true</span>; <span class="self">self</span> } } <span class="kw">impl</span><span class="op"><</span><span class="ident">S</span><span class="op">></span> <span class="ident">Middleware</span><span class="op"><</span><span class="ident">S</span><span class="op">></span> <span class="kw">for</span> <span class="ident">DefaultHeaders</span> { <span class="kw">fn</span> <span class="ident">response</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="kw">_</span>: <span class="kw-2">&</span><span class="ident">HttpRequest</span><span class="op"><</span><span class="ident">S</span><span class="op">></span>, <span class="kw-2">mut</span> <span class="ident">resp</span>: <span class="ident">HttpResponse</span>) <span class="op">-></span> <span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">Response</span><span class="op">></span> { <span class="kw">for</span> (<span class="ident">key</span>, <span class="ident">value</span>) <span class="kw">in</span> <span class="self">self</span>.<span class="ident">headers</span>.<span class="ident">iter</span>() { <span class="kw">if</span> <span class="op">!</span><span class="ident">resp</span>.<span class="ident">headers</span>().<span class="ident">contains_key</span>(<span class="ident">key</span>) { <span class="ident">resp</span>.<span class="ident">headers_mut</span>().<span class="ident">insert</span>(<span class="ident">key</span>, <span class="ident">value</span>.<span class="ident">clone</span>()); } } <span class="comment">// default content-type</span> <span class="kw">if</span> <span class="self">self</span>.<span class="ident">ct</span> <span class="op">&&</span> <span class="op">!</span><span class="ident">resp</span>.<span class="ident">headers</span>().<span class="ident">contains_key</span>(<span class="ident">CONTENT_TYPE</span>) { <span class="ident">resp</span>.<span class="ident">headers_mut</span>().<span class="ident">insert</span>( <span class="ident">CONTENT_TYPE</span>, <span class="ident">HeaderValue</span>::<span class="ident">from_static</span>(<span class="string">"application/octet-stream"</span>), ); } <span class="prelude-val">Ok</span>(<span class="ident">Response</span>::<span class="ident">Done</span>(<span class="ident">resp</span>)) } } <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">test</span>)]</span> <span class="kw">mod</span> <span class="ident">tests</span> { <span class="kw">use</span> <span class="kw">super</span>::<span class="kw-2">*</span>; <span class="kw">use</span> <span class="ident">http</span>::<span class="ident">header</span>::<span class="ident">CONTENT_TYPE</span>; <span class="kw">use</span> <span class="ident">test</span>::<span class="ident">TestRequest</span>; <span class="attribute">#[<span class="ident">test</span>]</span> <span class="kw">fn</span> <span class="ident">test_default_headers</span>() { <span class="kw">let</span> <span class="ident">mw</span> <span class="op">=</span> <span class="ident">DefaultHeaders</span>::<span class="ident">new</span>().<span class="ident">header</span>(<span class="ident">CONTENT_TYPE</span>, <span class="string">"0001"</span>); <span class="kw">let</span> <span class="ident">req</span> <span class="op">=</span> <span class="ident">TestRequest</span>::<span class="ident">default</span>().<span class="ident">finish</span>(); <span class="kw">let</span> <span class="ident">resp</span> <span class="op">=</span> <span class="ident">HttpResponse</span>::<span class="prelude-val">Ok</span>().<span class="ident">finish</span>(); <span class="kw">let</span> <span class="ident">resp</span> <span class="op">=</span> <span class="kw">match</span> <span class="ident">mw</span>.<span class="ident">response</span>(<span class="kw-2">&</span><span class="ident">req</span>, <span class="ident">resp</span>) { <span class="prelude-val">Ok</span>(<span class="ident">Response</span>::<span class="ident">Done</span>(<span class="ident">resp</span>)) <span class="op">=></span> <span class="ident">resp</span>, <span class="kw">_</span> <span class="op">=></span> <span class="macro">panic</span><span class="macro">!</span>(), }; <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">resp</span>.<span class="ident">headers</span>().<span class="ident">get</span>(<span class="ident">CONTENT_TYPE</span>).<span class="ident">unwrap</span>(), <span class="string">"0001"</span>); <span class="kw">let</span> <span class="ident">resp</span> <span class="op">=</span> <span class="ident">HttpResponse</span>::<span class="prelude-val">Ok</span>().<span class="ident">header</span>(<span class="ident">CONTENT_TYPE</span>, <span class="string">"0002"</span>).<span class="ident">finish</span>(); <span class="kw">let</span> <span class="ident">resp</span> <span class="op">=</span> <span class="kw">match</span> <span class="ident">mw</span>.<span class="ident">response</span>(<span class="kw-2">&</span><span class="ident">req</span>, <span class="ident">resp</span>) { <span class="prelude-val">Ok</span>(<span class="ident">Response</span>::<span class="ident">Done</span>(<span class="ident">resp</span>)) <span class="op">=></span> <span class="ident">resp</span>, <span class="kw">_</span> <span class="op">=></span> <span class="macro">panic</span><span class="macro">!</span>(), }; <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">resp</span>.<span class="ident">headers</span>().<span class="ident">get</span>(<span class="ident">CONTENT_TYPE</span>).<span class="ident">unwrap</span>(), <span class="string">"0002"</span>); } } </pre> </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>