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toctree-level-2 toctree-length-1"> <li><a href="#how-does-it-work">它是如何工作的呢?</a></li> </ul></li> <li><a href="#resource-hints">资源提示</a></li> </ul> </div> </div> </div> </div> </aside> <div class="content"> <div class="doc-content"> <main class="doc-content-contents"> <section class="ui-prose "> <article class="prose"> <h1 class="prose-title">资产预加载和资源提示与HTTP / 2和连接</h1> <a class="doc-action content-edit" href="https://github.com/symfony/symfony-docs/edit/6.3/web_link.rst"> <svg xmlns="http://www.w3.org/2000/svg" fill="none" viewbox="0 0 24 24" height="18" stroke="currentColor"> <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M15.232 5.232l3.536 3.536m-2.036-5.036a2.5 2.5 0 113.536 3.536L6.5 21.036H3v-3.572L16.732 3.732z"></path> </svg>编辑该页面</a> <div class="section"> <h1 id="asset-preloading-and-resource-hints-with-http-2-and-weblink"><a class="headerlink" href="#asset-preloading-and-resource-hints-with-http-2-and-weblink" title="资产预加载和资源提示与HTTP / 2和连接”>资产预加载和资源提示与HTTP / 2和连接</a></h1> <p>ob娱乐下载Symfony提供本机支持(通过<a href="https://github.com/symfony/web-link" class="reference external" rel="external noopener noreferrer" target="_blank">连接</a>管理组件)<code translate="no" class="notranslate">链接</code>HTTP头信息,提高应用程序性能的关键在使用HTTP / 2和预加载功能的现代web浏览器。</p> <p><code translate="no" class="notranslate">链接</code>标题中使用<a href="https://tools.ietf.org/html/rfc7540" class="reference external" rel="external noopener noreferrer" target="_blank">HTTP / 2服务器推送</a>和W3C的<a href="https://www.w3.org/TR/resource-hints/" class="reference external" rel="external noopener noreferrer" target="_blank">资源提示</a>推动资源(例如CSS和JavaScript文件)给客户之前,他们甚至知道他们需要他们。连接还允许使用HTTP 1. x的其他优化:</p> <ul> <li>要求浏览器获取或呈现另一个web页面的背景;</li> <li>早期的DNS查找,TCP握手或TLS协商。</li> </ul> <p>重要的事情要考虑的是,所有这些HTTP / 2功能需要一个安全的HTTPS连接,即使工作在本地机器上。主要的web服务器(Apache、nginx盒等)的支持,但还可以使用<a href="https://github.com/dunglas/symfony-docker" class="reference external" rel="external noopener noreferrer" target="_blank">Symfony的码头工人安装和运行时ob娱乐下载</a>由凯文•Dunglas Symfony的社区。欧宝体育平台怎么样ob娱乐下载</p> <div class="section"> <h2 id="preloading-assets"><a class="headerlink" href="#preloading-assets" title="预加载的资产”>预加载的资产</a></h2> <p>假设您的应用程序包含一个web页面如下:</p> <div translate="no" data-loc="13" class="notranslate codeblock codeblock-length-md codeblock-html"> <div class="codeblock-scroll"> <pre class="codeblock-lines">1 2 3 4 5 6 7 8 9 10 11 12 13</pre> <pre class="codeblock-code"><code><span class="hljs-meta">< ! DOCTYPE<span class="hljs-meta-keyword">html</span>></span><span class="hljs-tag"><<span class="hljs-name">html</span>></span><span class="hljs-tag"><<span class="hljs-name">头</span>></span><span class="hljs-tag"><<span class="hljs-name">元</span><span class="hljs-attr">字符集</span>=<span class="hljs-string">“utf - 8”</span>></span><span class="hljs-tag"><<span class="hljs-name">标题</span>></span>我的应用程序<span class="hljs-tag">< /<span class="hljs-name">标题</span>></span><span class="hljs-tag"><<span class="hljs-name">链接</span><span class="hljs-attr">rel</span>=<span class="hljs-string">“样式表”</span><span class="hljs-attr">href</span>=<span class="hljs-string">“/ app.css”</span>></span><span class="hljs-tag">< /<span class="hljs-name">头</span>></span><span class="hljs-tag"><<span class="hljs-name">身体</span>></span><span class="hljs-tag"><<span class="hljs-name">主要</span><span class="hljs-attr">角色</span>=<span class="hljs-string">“主要”</span><span class="hljs-attr">类</span>=<span class="hljs-string">“容器”</span>></span><span class="hljs-comment">< !——……- - ></span><span class="hljs-tag">< /<span class="hljs-name">主要</span>></span><span class="hljs-tag">< /<span class="hljs-name">身体</span>></span><span class="hljs-tag">< /<span class="hljs-name">html</span>></span></code></pre> </div> </div> <p>传统的HTTP工作流后,当这个页面提供浏览器将一个请求的HTML页面,另一个请求相关的CSS文件。然而,由于HTTP / 2应用程序就可以开始发送CSS文件内容之前浏览器请求。</p> <p>要做到这一点,首先安装连接组件:</p> <div translate="no" data-loc="1" class="notranslate codeblock codeblock-length-sm codeblock-terminal codeblock-bash"> <div class="codeblock-scroll"> <pre class="codeblock-lines">1</pre> <pre class="codeblock-code"><code><span class="hljs-prompt">美元</span>作曲家需要symfony /网页链ob娱乐下载接</code></pre> </div> </div> <p>现在,更新模板使用<code translate="no" class="notranslate">预加载()</code>树枝函数提供的连接。的<a href="https://w3c.github.io/preload/" class="reference external" rel="external noopener noreferrer" target="_blank">“作为”属性</a>是强制性的,因为浏览器需要运用正确的优先级和内容安全策略:</p> <div translate="no" data-loc="4" class="notranslate codeblock codeblock-length-sm codeblock-html+twig codeblock-twig"> <div class="codeblock-scroll"> <pre class="codeblock-lines">1 2 3 4</pre> <pre class="codeblock-code"><code><span class="xml"><span class="hljs-tag"><<span class="hljs-name">头</span>></span><span class="hljs-comment">< !——……- - ></span><span class="hljs-tag"><<span class="hljs-name">链接</span><span class="hljs-attr">rel</span>=<span class="hljs-string">“预”</span><span class="hljs-attr">href</span>=<span class="hljs-string">”</span></span></span><span class="hljs-template-variable">{{预加载(' /应用程序。css,{:‘风格’})}}</span><span class="xml"><span class="hljs-tag"><span class="hljs-string">”</span>></span><span class="hljs-tag">< /<span class="hljs-name">头</span>></span></span></code></pre> </div> </div> <p>如果你重新装载页面,感知性能会提高,因为服务器回应与HTML页面和CSS文件仅当浏览器请求的HTML页面。</p> <div class="admonition admonition-note "> <p class="admonition-title"> <svg fill="none" width="24" height="24" viewbox="0 0 24 24" stroke="currentColor"> <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M11 5H6a2 2 0 00-2 2v11a2 2 0 002 2h11a2 2 0 002-2v-5m-1.414-9.414a2 2 0 112.828 2.828L11.828 15H9v-2.828l8.586-8.586z"></path> </svg><span>请注意</span></p> <p>你可以通过包装的预加载一个资产<code translate="no" class="notranslate">预加载()</code>功能:</p> <div translate="no" data-loc="4" class="notranslate codeblock codeblock-length-sm codeblock-html+twig codeblock-twig"> <div class="codeblock-scroll"> <pre class="codeblock-lines">1 2 3 4</pre> <pre class="codeblock-code"><code><span class="xml"><span class="hljs-tag"><<span class="hljs-name">头</span>></span><span class="hljs-comment">< !——……- - ></span><span class="hljs-tag"><<span class="hljs-name">链接</span><span class="hljs-attr">rel</span>=<span class="hljs-string">“预”</span><span class="hljs-attr">href</span>=<span class="hljs-string">”</span></span></span><span class="hljs-template-variable">{{预加载(资产(“构建/ app.css”))}}</span><span class="xml"><span class="hljs-tag"><span class="hljs-string">”</span>></span><span class="hljs-tag">< /<span class="hljs-name">头</span>></span></span></code></pre> </div> </div> </div> <p>此外,据<a href="https://wicg.github.io/priority-hints/" class="reference external" rel="external noopener noreferrer" target="_blank">重点提示规范</a>,你可以信号优先的资源下载使用<code translate="no" class="notranslate">重要性</code>属性:</p> <div translate="no" data-loc="4" class="notranslate codeblock codeblock-length-sm codeblock-html+twig codeblock-twig"> <div class="codeblock-scroll"> <pre class="codeblock-lines">1 2 3 4</pre> <pre class="codeblock-code"><code><span class="xml"><span class="hljs-tag"><<span class="hljs-name">头</span>></span><span class="hljs-comment">< !——……- - ></span><span class="hljs-tag"><<span class="hljs-name">链接</span><span class="hljs-attr">rel</span>=<span class="hljs-string">“预”</span><span class="hljs-attr">href</span>=<span class="hljs-string">”</span></span></span><span class="hljs-template-variable">{{预加载(' /应用程序。css,{:“风格”,重要性:'低'})}}</span><span class="xml"><span class="hljs-tag"><span class="hljs-string">”</span>></span><span class="hljs-tag">< /<span class="hljs-name">头</span>></span></span></code></pre> </div> </div> <div class="section"> <h3 id="how-does-it-work"><a class="headerlink" href="#how-does-it-work" title="它是如何工作的呢?”>它是如何工作的呢?</a></h3> <p>管理的连接组件<code translate="no" class="notranslate">链接</code>HTTP头信息添加到响应。当使用<code translate="no" class="notranslate">预加载()</code>函数在上一个示例中,下面的标题添加到反应:<code translate="no" class="notranslate">链接< / app.css >;rel = "预加载”;=“风格”</code>根据<a href="https://www.w3.org/TR/preload/" class="reference external" rel="external noopener noreferrer" target="_blank">预加载规范</a>,当一个HTTP / 2服务器检测到原始(HTTP 1. x)响应包含HTTP头,它会自动触发一个推动相关文件在同一HTTP / 2连接。</p> <p>受欢迎的代理服务和发布商包括<a href="https://blog.cloudflare.com/announcing-support-for-http-2-server-push-2/" class="reference external" rel="external noopener noreferrer" target="_blank">ob直播appCloudflare</a>,<a href="https://docs.fastly.com/en/guides/http2-server-push" class="reference external" rel="external noopener noreferrer" target="_blank">急剧</a>和<a href="https://http2.akamai.com/" class="reference external" rel="external noopener noreferrer" target="_blank">Akamai</a>还利用这个特性。这意味着你可以把资源给客户和现在在生产中改进应用程序的性能。</p> <p>如果你想防止推动但让浏览器预加载资源通过发行提前单独的HTTP请求,使用<code translate="no" class="notranslate">nopush</code>选择:</p> <div translate="no" data-loc="4" class="notranslate codeblock codeblock-length-sm codeblock-html+twig codeblock-twig"> <div class="codeblock-scroll"> <pre class="codeblock-lines">1 2 3 4</pre> <pre class="codeblock-code"><code><span class="xml"><span class="hljs-tag"><<span class="hljs-name">头</span>></span><span class="hljs-comment">< !——……- - ></span><span class="hljs-tag"><<span class="hljs-name">链接</span><span class="hljs-attr">rel</span>=<span class="hljs-string">“预”</span><span class="hljs-attr">href</span>=<span class="hljs-string">”</span></span></span><span class="hljs-template-variable">{{预加载(' /应用程序。css,{:“风格”,nopush:真正})}}</span><span class="xml"><span class="hljs-tag"><span class="hljs-string">”</span>></span><span class="hljs-tag">< /<span class="hljs-name">头</span>></span></span></code></pre> </div> </div> </div> </div> <div class="section"> <h2 id="resource-hints"><a class="headerlink" href="#resource-hints" title="资源提示”>资源提示</a></h2> <p><a href="https://www.w3.org/TR/resource-hints/" class="reference external" rel="external noopener noreferrer" target="_blank">资源提示</a>使用应用程序来帮助浏览器在决定哪些资源应该下载,预处理或连接到第一。</p> <p>连接组件提供以下分支函数来发送这些提示:</p> <ul> <li><code translate="no" class="notranslate">dns_prefetch ()</code>:“表示一个来源(如。<code translate="no" class="notranslate">https://foo.ob直播appcloudfront.net</code>),将被用来获取所需资源,和用户代理应尽早解决”。</li> <li><code translate="no" class="notranslate">preconnect ()</code>:“表示一个来源(如。<code translate="no" class="notranslate">https://www.pdashmedia.com</code>),将被用来获取所需的资源。启动早期连接,包括DNS查找,TCP握手,和可选的TLS协商,允许用户代理面具建立连接的延迟成本高”。</li> <li><code translate="no" class="notranslate">预取()</code>:“确定所需的资源,可能是下一个导航,用户代理<em>应该</em>获取,这样用户代理可以提供更快的响应,一旦资源请求在未来”。</li> <li><code translate="no" class="notranslate">prerender ()</code>:“确定所需的资源,可能是下一个导航,用户代理<em>应该</em>获取和执行,这样用户代理可以提供更快的响应,一旦资源请求之后”。</li> </ul> <p>组件还支持发送HTTP链接实现与性能和任何联系<a href="https://www.php-fig.org/psr/psr-13/" class="reference external" rel="external noopener noreferrer" target="_blank">PSR-13</a>标准。例如,任何<a href="https://html.spec.whatwg.org/dev/links.html" class="reference external" rel="external noopener noreferrer" target="_blank">链接的HTML规范中定义</a>:</p> <div translate="no" data-loc="5" class="notranslate codeblock codeblock-length-sm codeblock-html+twig codeblock-twig"> <div class="codeblock-scroll"> <pre class="codeblock-lines">1 2 3 4 5</pre> <pre class="codeblock-code"><code><span class="xml"><span class="hljs-tag"><<span class="hljs-name">头</span>></span><span class="hljs-comment">< !——……- - ></span><span class="hljs-tag"><<span class="hljs-name">链接</span><span class="hljs-attr">rel</span>=<span class="hljs-string">“替代”</span><span class="hljs-attr">href</span>=<span class="hljs-string">”</span></span></span><span class="hljs-template-variable">{{链接(' /索引。jsonld”、“备用”)}}</span><span class="xml"><span class="hljs-tag"><span class="hljs-string">”</span>></span><span class="hljs-tag"><<span class="hljs-name">链接</span><span class="hljs-attr">rel</span>=<span class="hljs-string">“预”</span><span class="hljs-attr">href</span>=<span class="hljs-string">”</span></span></span><span class="hljs-template-variable">{{预加载(' /应用程序。css,{:“风格”,nopush:真正})}}</span><span class="xml"><span class="hljs-tag"><span class="hljs-string">”</span>></span><span class="hljs-tag">< /<span class="hljs-name">头</span>></span></span></code></pre> </div> </div> <p>前面的代码片段将导致这个HTTP头被发送到客户端:<code translate="no" class="notranslate">链接:< / index.jsonld >;rel = "替代",< / app.css >;rel = "预加载”;nopush</code></p> <p>您也可以将链接添加到HTTP响应直接从控制器和服务:</p> <div translate="no" data-loc="25" class="notranslate codeblock codeblock-length-md codeblock-php"> <div class="codeblock-scroll"> <pre class="codeblock-lines">1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21日22日23日24日25</pre> <pre class="codeblock-code"><code><span class="hljs-comment">/ / src /控制器/ BlogController.php</span><span class="hljs-keyword">名称空间</span><span class="hljs-title">应用程序</span>\<span class="hljs-title">控制器</span>;<span class="hljs-keyword">使用</span><span class="hljs-title">ob娱乐下载</span>\<span class="hljs-title">包</span>\<span class="hljs-title">FrameworkBundle</span>\<span class="hljs-title">控制器</span>\<span class="hljs-title">AbstractController</span>;<span class="hljs-keyword">使用</span><span class="hljs-title">ob娱乐下载</span>\<span class="hljs-title">组件</span>\<span class="hljs-title">HttpFoundation</span>\<span class="hljs-title">请求</span>;<span class="hljs-keyword">使用</span><span class="hljs-title">ob娱乐下载</span>\<span class="hljs-title">组件</span>\<span class="hljs-title">HttpFoundation</span>\<span class="hljs-title">响应</span>;<span class="hljs-keyword">使用</span><span class="hljs-title">ob娱乐下载</span>\<span class="hljs-title">组件</span>\<span class="hljs-title">连接</span>\<span class="hljs-title">GenericLinkProvider</span>;<span class="hljs-keyword">使用</span><span class="hljs-title">ob娱乐下载</span>\<span class="hljs-title">组件</span>\<span class="hljs-title">连接</span>\<span class="hljs-title">链接</span>;<span class="hljs-class"><span class="hljs-keyword">类</span><span class="hljs-title">BlogController</span><span class="hljs-keyword">扩展</span><span class="hljs-title">AbstractController</span></span>{<span class="hljs-keyword">公共</span><span class="hljs-function"><span class="hljs-keyword">函数</span><span class="hljs-title">指数</span><span class="hljs-params">(请求<span class="hljs-variable"><span class="hljs-variable-other-marker">美元</span>请求</span>)</span>:<span class="hljs-title">响应</span></span>{<span class="hljs-comment">/ /使用通过addLink () AbstractController提供的快捷方式</span><span class="hljs-variable"><span class="hljs-variable-other-marker">美元</span>这</span><span class="hljs-operator">- ></span>通过addLink (<span class="hljs-variable"><span class="hljs-variable-other-marker">美元</span>请求</span>,<span class="hljs-keyword">新</span>链接(<span class="hljs-string">预加载的</span>,<span class="hljs-string">' / app.css '</span>));<span class="hljs-comment">/ /选择如果你不想使用通过addLink()的快捷方式</span><span class="hljs-variable"><span class="hljs-variable-other-marker">美元</span>linkProvider</span>=<span class="hljs-variable"><span class="hljs-variable-other-marker">美元</span>请求</span><span class="hljs-operator">- ></span>属性<span class="hljs-operator">- ></span>get (<span class="hljs-string">“_links”</span>,<span class="hljs-keyword">新</span>GenericLinkProvider ());<span class="hljs-variable"><span class="hljs-variable-other-marker">美元</span>请求</span><span class="hljs-operator">- ></span>属性<span class="hljs-operator">- ></span>集(<span class="hljs-string">“_links”</span>,<span class="hljs-variable"><span class="hljs-variable-other-marker">美元</span>linkProvider</span><span class="hljs-operator">- ></span>withLink ((<span class="hljs-keyword">新</span>链接(<span class="hljs-string">预加载的</span>,<span class="hljs-string">' / app.css '</span>))<span class="hljs-operator">- ></span>withAttribute (<span class="hljs-string">“是”</span>,<span class="hljs-string">“风格”</span>)));<span class="hljs-keyword">返回</span><span class="hljs-variable"><span class="hljs-variable-other-marker">美元</span>这</span><span class="hljs-operator">- ></span>呈现(<span class="hljs-string">“……”</span>);}}</code></pre> </div> </div> </div> </div> <div class="doc-license"> 这项工作,包括代码示例,许可下<a rel="license" href="https://creativecommons.org/licenses/by-sa/3.0/">Creative Commons冲锋队3.0</a>许可证。</div> </article> </section> <div 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