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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta name="renderer" content="webkit">
<meta http-equiv="X-UA-Compatible" content="IE=edge" >
<link rel="dns-prefetch" href="https://lightxj.github.io">
<title>LightXJ的博客</title>
<meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1">
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#container.show {
background: linear-gradient(200deg,#a0cfe4,#e8c37e);
}
</style>
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<ul>
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<article id="post-web缓存" class="article article-type-post article-index" itemscope itemprop="blogPost">
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<h1 itemprop="name">
<a class="article-title" href="/2020/04/20/web%E7%BC%93%E5%AD%98/">web缓存</a>
</h1>
<a href="/2020/04/20/web%E7%BC%93%E5%AD%98/" class="archive-article-date">
<time datetime="2020-04-20T09:42:18.000Z" itemprop="datePublished"><i class="icon-calendar icon"></i>2020-04-20</time>
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<div class="article-entry" itemprop="articleBody">
<h2 id="一、什么是web缓存（或HTTP缓存）？"><a href="#一、什么是web缓存（或HTTP缓存）？" class="headerlink" title="一、什么是web缓存（或HTTP缓存）？"></a>一、什么是web缓存（或HTTP缓存）？</h2><p>Web缓存（或HTTP缓存）是用于临时存储（缓存）Web文档（如HTML页面和图像），以减少服务器延迟的一种信息技术。Web缓存系统会保存下通过这套系统的文档的副本；如果满足某些条件，则可以由缓存满足后续请求。 Web缓存系统既可以指设备，也可以指计算机程序。</p>
<h2 id="二、web缓存的作用"><a href="#二、web缓存的作用" class="headerlink" title="二、web缓存的作用"></a>二、web缓存的作用</h2><p>• 缓存减少了冗余的数据传输，节省了你的网络费用。<br>• 缓存缓解了网络瓶颈的问题。不需要更多的带宽就能够更快地加载页面。<br>• 缓存降低了对原始服务器的要求。服务器可以更快地响应，避免过载的出现。<br>• 缓存降低了距离时延，因为从较远的地方加载页面会更慢一些。 </p>
<h2 id="三、web缓存的种类"><a href="#三、web缓存的种类" class="headerlink" title="三、web缓存的种类"></a>三、web缓存的种类</h2><h4 id="1-数据库缓存"><a href="#1-数据库缓存" class="headerlink" title="1.数据库缓存"></a>1.数据库缓存</h4><p> 我们可能听说过memcached，它就是一种数据库层面的缓存方案。数据库缓存是指，当web应用的关系比较复杂，数据库中的表很多的时候，如果频繁进行数据库查询，很容易导致数据库不堪重荷。为了提供查询的性能，将查询后的数据放到内存中进行缓存，下次查询时，直接从内存缓存直接返回，提供响应效率。</p>
<h4 id="2-CDN缓存"><a href="#2-CDN缓存" class="headerlink" title="2.CDN缓存"></a>2.CDN缓存</h4><p> CDN缓存一般是由网站管理员自己部署，为了让他们的网站更容易扩展并获得更好的性能。通常情况下，浏览器先向CDN网关发起Web请求，网关服务器后面对应着一台或多台负载均衡源服务器，会根据它们的负载请求，动态将请求转发到合适的源服务器上。从浏览器角度来看，整个CDN就是一个源服务器，从这个层面来说，浏览器和服务器之间的缓存机制，在这种架构下同样适用。</p>
<h4 id="3-代理服务器缓存"><a href="#3-代理服务器缓存" class="headerlink" title="3.代理服务器缓存"></a>3.代理服务器缓存</h4><p> 代理服务器是浏览器和源服务器之间的中间服务器，浏览器先向这个中间服务器发起Web请求，经过处理后（比如权限验证，缓存匹配等），再将请求转发到源服务器。代理服务器缓存的运作原理跟浏览器的运作原理差不多，只是规模更大。</p>
<h4 id="4-浏览器缓存"><a href="#4-浏览器缓存" class="headerlink" title="4.浏览器缓存"></a>4.浏览器缓存</h4><p> 每个浏览器都实现了 HTTP 缓存，我们通过浏览器使用HTTP协议与服务器交互的时候，浏览器就会根据一套与服务器约定的规则进行缓存工作。</p>
<h4 id="5-应用层缓存"><a href="#5-应用层缓存" class="headerlink" title="5.应用层缓存"></a>5.应用层缓存</h4><p> 应用层缓存指的是从代码层面上，通过代码逻辑和缓存策略，实现对数据，页面，图片等资源的缓存，可以根据实际情况选择将数据存在文件系统或者内存中，减少数据库查询或者读写瓶颈，提高响应效率。</p>
<p>另一种分类方式是：</p>
<h4 id="1、私有缓存"><a href="#1、私有缓存" class="headerlink" title="1、私有缓存"></a>1、私有缓存</h4><p>私有缓存不需要很大的动力或存储空间，这样就可以将其做得很小，很便宜。Web 浏 览器中有内建的私有缓存——大多数浏览器都会将常用文档缓存在你个人电脑的磁盘 和内存中，并且允许用户去配置缓存的大小和各种设置。chrome浏览器就有私有缓存，可以通过chrome://cache/查看</p>
<h4 id="2、公有缓存"><a href="#2、公有缓存" class="headerlink" title="2、公有缓存"></a>2、公有缓存</h4><p>公有缓存是特殊的共享代理服务器，被称为缓存代理服务器(caching proxy server)，或者更常见地被称为代理缓存(proxy cache)。代理缓存会从本地缓存中提供文档，或者代表用户与服务器进行联系。公有缓存会接受来自多个用户的访问，所以通过它可以更好地减少冗余流量。</p>
<h3 id="四、缓存的处理步骤"><a href="#四、缓存的处理步骤" class="headerlink" title="四、缓存的处理步骤"></a>四、缓存的处理步骤</h3><h3 id="五、服务器再验证"><a href="#五、服务器再验证" class="headerlink" title="五、服务器再验证"></a>五、服务器再验证</h3><ul>
<li>如果再验证显示内容发生了变化，缓存会获取一份新的文档副本，并将其存储在旧文档的位置上，然后将文档发送给客户端。 </li>
<li>如果再验证显示内容没有发生变化，缓存只需要获取新的首部，包括一个新的过期日期，并对缓存中的首部进行更新就行了</li>
</ul>
<h4 id="验证方式：条件验证"><a href="#验证方式：条件验证" class="headerlink" title="验证方式：条件验证"></a>验证方式：条件验证</h4><p>那么什么时候用实体标签ETag或者最后修改日期Last-Modified-Since进行验证？<br>如果服务器回送了一个实体标签，HTTP/1.1 客户端就必须使用实体标签验证器。如果服务器只回送了一个 Last-Modified 值，客户端就可以使用 If-Modified-Since 验证。<br>如果实体标签和最后修改日期都提供了，客户端就应该使用这两种再验证方案，这样 HTTP/1.0 和 HTTP/1.1 缓存就都可以正确响应了。这种情况下，两者都满足时，才能返回 304 Not Modified 响应。</p>
<h3 id="六、服务器控制缓存"><a href="#六、服务器控制缓存" class="headerlink" title="六、服务器控制缓存"></a>六、服务器控制缓存</h3><p>服务器可以通过 HTTP 定义的几种方式来指定在文档过期之前可以将其缓存多长时间。按照<strong>优先级递减</strong>的顺序，服务器可以:</p>
<ul>
<li>附加一个 Cache-Control: no-store 首部到响应中去; </li>
<li>附加一个 Cache-Control: no-cache 首部到响应中去; </li>
<li>附加一个 Cache-Control: must-revalidate 首部到响应中去; </li>
<li>附加一个 Cache-Control: max-age=< seconds > 首部到响应中去;</li>
<li>附加一个 Expires 日期首部到响应中去; </li>
<li>不附加过期信息，让缓存确定自己的过期日期。 </li>
</ul>
<p>下面详细解释一下他们的区别：</p>
<h4 id="no-store与no-cache响应首部"><a href="#no-store与no-cache响应首部" class="headerlink" title="no-store与no-cache响应首部"></a>no-store与no-cache响应首部</h4><p>Pragma: no-cache<br>Cache-Control: no-store<br>Cache-Control: no-cache<br>标识为 no-store 的响应会禁止缓存对响应进行复制。缓存通常会像非缓存代理服务器一样，向客户端转发一条 no-store 响应，然后删除对象。<br>标识为 no-cache 的响应实际上是可以存储在本地缓存区中的。只是在与<strong>原始服务器</strong>进行新鲜度再验证之前，缓存不能将其提供给客户端使用。这个首部使用 do-not-serve-from-cache-without-revalidation 这个名字会更恰当一些。<br>HTTP/1.1 中提供Pragma: no-cache 首部是为了兼容于HTTP/1.0+。除了与只理解 Pragma: no-cache 的 HTTP/1.0 应用程序进行交互时，HTTP 1.1 应用程序都应该使用 Cache-Control: no-cache。</p>
<h4 id="max-age响应首部"><a href="#max-age响应首部" class="headerlink" title="max-age响应首部"></a>max-age响应首部</h4><p>Cache-Control: max-age首部表示的是从服务器将文档传来之时起，可以认为此文档处于新鲜状态的<strong>秒数</strong>。<br>还有一个s-maxage** 首部(注意 maxage 的中间没有连字符)，其行为与 max-age 类似，但仅适用于共享(公有)缓存。<br>使用方式：Cache-Control: max-age=3600 Cache-Control: s-maxage=3600</p>
<p>服务器可以请求缓存不要缓存文档，或者将最大使用期设置为零，从而在每次访问的时候都进行刷新:<br>Cache-Control: max-age=0 Cache-Control: s-maxage=0</p>
<h4 id="Expires响应首部"><a href="#Expires响应首部" class="headerlink" title="Expires响应首部"></a>Expires响应首部</h4><p><strong>不推荐使用Expires首部</strong>，它指定的是实际的过期日期而不是秒数。HTTP设计者后来认为，由于很多服务器的时钟都不同步，或者不正确，所以最好还是用剩余秒数，而不是绝对时间来表示过期时间。</p>
<h4 id="must-revalidate响应首部"><a href="#must-revalidate响应首部" class="headerlink" title="must-revalidate响应首部"></a>must-revalidate响应首部</h4><p>Cache-Control: must-revalidate 响应首部告诉缓存，在事先没有跟<strong>原始服务器</strong>进行再验证的情况下，不能提供这个对象的陈旧副本。缓存仍然可以随意提供新鲜的副本。通俗的将就是告诉浏览器、缓存服务器，本地副本过期前，可以使用本地副本；本地副本一旦过期，必须去源服务器进行有效性校验。如果在缓存进行 must-revalidate 新鲜度检查时，原始服务器不可用，缓存就必须返回一条 504 Gateway Timeout 错误。<br>如果响应头的 Cache-Control 只有 max-age 指令（并且没有 stale-while-revalidate 指令），客户端会默认使用 must-revalidate 策略 (Chromium 源码), 在重新验证之后会 重置过期时间 。<br>实践举例：<br>1、第一次请求img1.jpeg资源，响应头里返回 Cache-Control:max-age=60<br>2、然后60s内再次请求：直接从缓存中读取，没有去请求源服务器<br>3、60s后，源文件没变化，再去请求，返回304 Not Modified，并且更新了缓存时间。<br>4、接下来60s内，直接从缓存读取。</p>
<h4 id="试探性过期"><a href="#试探性过期" class="headerlink" title="试探性过期"></a>试探性过期</h4><p>如果响应中没有 Cache-Control: max-age 首部，也没有Expires首部，缓存可以计算出一个试探性最大使用期。可以使用任意算法，但如果得到的最大使用期大 于 24 小时，就应该向响应首部添加一个 Heuristic Expiration Warning(试探性过期 警告，警告 13)首部。<br>它们可能比你想象的要常见得多。很多原始服 务器仍然不会产生 Expires 和 max-age 首部。选择缓存过期的默认时间时要特别小心!<br>实践举例：<br>服务器没有返回Cache-Control也没有Expires首部，但是在此请求资源时使用了缓存。</p>
<h3 id="七、客户端的新鲜度限制"><a href="#七、客户端的新鲜度限制" class="headerlink" title="七、客户端的新鲜度限制"></a>七、客户端的新鲜度限制</h3><p>Web 浏览器都有 Refresh(刷新)或 Reload(重载)按钮，可以强制对浏览器或 代理缓存中可能过期的内容进行刷新。Refresh 按钮会发布一个附加了 Cache- Control 请求首部的 GET 请求，这个请求会强制进行再验证，或者无条件地从服 务器获取文档。Refresh 的确切行为取决于特定的浏览器、文档以及拦截缓存的配置。<br>客户端可以用 Cache-Control 请求首部来强化或放松对过期时间的限制。有些应 用程序对文档的新鲜度要求很高(比如人工刷新按钮)，对这些应用程序来说，客 户端可以用 Cache-Control 首部使过期时间更严格。另一方面，作为提高性能、 可靠性或开支的一种折衷方式，客户端可能会放松新鲜度要求。表 7-4 对 Cache- Control 请求指令进行了总结。</p>
<h3 id="八、缓存优先级问题"><a href="#八、缓存优先级问题" class="headerlink" title="八、缓存优先级问题"></a>八、缓存优先级问题</h3><h3 id="九、如果304的请求，返回新的cache-control-max-age等，会更新本地的缓存吗？"><a href="#九、如果304的请求，返回新的cache-control-max-age等，会更新本地的缓存吗？" class="headerlink" title="九、如果304的请求，返回新的cache-control:max-age等，会更新本地的缓存吗？"></a>九、如果304的请求，返回新的cache-control:max-age等，会更新本地的缓存吗？</h3><p>八、缓存与广告<br>很多内容提供商的收益都是通过广告实现的——具体来说，每 向用户显示一次广告内容，内容提供商就会得到相应的收益。(可能还不到一两便 士，但如果一天显示数百万条广告的话，这些钱就会叠加起来!)这就是缓存的问 题——它们会向原始服务器隐藏实际的访问次数。如果缓存工作得很好，原始服务 器可能根本收不到任何 HTTP 访问，因为这些访问都被因特网缓存吸收了。<br>所以现在，广告商会使用各种类型的“缓存清除”技术来确保缓存不会窃取他们的命中 流量。他们会在内容上加上 no-cache 首部。他们会通过 CGI 网关提供广告。还会 在每次访问时重写广告 URL。<br>理想情况下，内容提供商会让缓存吸收其流量，而缓存会告诉内容提供商它们拦截 了多少次命中。现在，缓存有好几种方式可以做到这一点。<br>一种解决方案就是配置缓存，每次访问时都与原始服务器进行再验证。这样，每次 访问时都会将命中推向原始服务器，但通常不会传送任何主体数据。当然，这样会 降低事务处理的速度。</p>
<p>九、问题<br>1、响应中新鲜度信息是怎么加的？难道不是原生服务器增加的吗？如果原始服务器没有返回这些信息，缓存是根据什么来增加的，缓存时间是多长？</p>
<p>2、请求首部的cache-control是如何加上的？<br>比如我请求一个资源，请求头中就有cache-control：….，这种信息，如果是浏览器的refresh或者reload可以理解，是浏览器为每个请求加上的，那要是不是refresh或者relaod呢？比如例如js插入一幅图片，请求图片地址时可以有cache-control吗？还有服务器给客户端返回的cache-control和这个请求首部的cache-control有没有联系呢？</p>
<p>回答：首先，浏览器的reload或者refresh并不是给页面中的每个请求都加，而是给当前刷新时的请求加max-age=0或者cache-control:no-cache。所以js插入一幅图片，去请求时浏览器不会自动加max-age=0或者cache-control:no-cache的。<br>服务器给客户端返回的cache-control和这个请求首部的cache-control没有联系，是分别独立的。但是如果一个请求返回了Etag,last-modified首部的话，下次请求原服务器会带上这两个字段。</p>
<p>3、disk cache 和 memory cache的区别?<br>200 OK (from memory cache)<br>200 OK (from disk cache)<br>请求静态资源时这两种情况都存在<br>200 from memory cache</p>
<p>不访问服务器，直接读缓存，从内存中读取缓存。此时的数据时缓存到内存中的，当kill进程后，也就是浏览器关闭以后，数据将不存在。但是这种方式只能缓存派生资源。<br>200 from disk cache</p>
<p>不访问服务器，直接读缓存，从磁盘中读取缓存，当kill进程时，数据还是存在。这种方式也只能缓存派生资源 。</p>
<p>十、在前端性能优化中应用HTTP缓存的三部曲</p>
<p>十一、持久化缓存</p>
<p>十二、参考<br>1、HTTP权威指南<br>2、在前端性能优化中应用HTTP缓存的三部曲<a href="https://zhuanlan.zhihu.com/p/25404480" target="_blank" rel="noopener">https://zhuanlan.zhihu.com/p/25404480</a></p>
<p>未完..内容待填充</p>
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<a class="article-title" href="/2020/04/20/curl/">curl</a>
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<p>curl 命令主要用于发出网络请求、提取数据。支持HTTP/HTTPS、FTP/FTPS、RTSP、POP3/POP3S、SCP、IMAP/IMAPS等协议。</p>
<h3 id="一、常用参数"><a href="#一、常用参数" class="headerlink" title="一、常用参数"></a>一、常用参数</h3><p>1、常用命令参数</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br></pre></td><td class="code"><pre><span class="line">-I 状态码 http </span><br><span class="line">-o 抓取页面到一个文件中</span><br><span class="line">-x 代理</span><br><span class="line">-X curl默认的http动作是GET 使用-X参数可以支持其他动作</span><br><span class="line">-v 可以显示一次http通信的整个过程</span><br><span class="line">-u 账号：密码</span><br><span class="line">-s silent 静音模式</span><br></pre></td></tr></table></figure>
<p>2、指定请求方法</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line">-X POST 使用post方法，当使用post方法的时候，可以通过--data "user=dq" 方式来传递参数</span><br><span class="line">-X get 使用get方法，参数直接放到url后面</span><br></pre></td></tr></table></figure>
<p>3、指定referer</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line">--referer url</span><br><span class="line">比如 curl --referer "www.baidu.com" https://www.baidu.com</span><br></pre></td></tr></table></figure>
<p>4、指定客户端的设备信息</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line">--user-agent "User Agent"</span><br><span class="line"> 比如curl -v --user-agent "Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/63.0.3239.84 Safari/537.36" https://www.baidu.com</span><br></pre></td></tr></table></figure>
<p>5、指定cookie</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line">--cookie "name=xxx"</span><br><span class="line"> 比如curl -v --cookie "name=dqs” https://www.baidu.com</span><br></pre></td></tr></table></figure>
<p>6、添加http认证</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line">--user name:password</span><br><span class="line"> 比如curl -v --user dq:123456 http://baidu.com</span><br></pre></td></tr></table></figure>
<p>7、指定host</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line">-H "host:val"</span><br><span class="line"> 比如curl -H "host:www.findme.wang" 60.205.21.85:80</span><br></pre></td></tr></table></figure>
<p>8、添加header头</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line">-H "key:val"</span><br><span class="line"> 比如curl -v -H "Accept:text/html" https://www.baidu.com</span><br></pre></td></tr></table></figure>
<p>9、设置代理</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br></pre></td><td class="code"><pre><span class="line">-x host:port</span><br><span class="line">-x [protocol://[user:pwd@]host[:port]</span><br><span class="line">--proxy [protocol://[user:pwd@]host[:port]</span><br><span class="line">比如curl -x 192.168.13.149:8081 127.0.0.1</span><br></pre></td></tr></table></figure>
<p>10、上传文件和图片</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line">-F "filename=@fileName" 上传文件</span><br><span class="line">-F "image=@fileName" 上传图片</span><br><span class="line">比如curl -F "filename=@test.txt" -F "image=@img.png" http://127.0.0.1</span><br></pre></td></tr></table></figure>
<h3 id="二、看响应头"><a href="#二、看响应头" class="headerlink" title="二、看响应头"></a>二、看响应头</h3><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line">curl命令默认请求返回的是响应内容，如果想只看响应头，可以通过-I参数</span><br><span class="line">curl -I 只看响应头</span><br><span class="line">curl -i 看响应头+响应体</span><br></pre></td></tr></table></figure>
<h3 id="三、查看请求和响应所有内容"><a href="#三、查看请求和响应所有内容" class="headerlink" title="三、查看请求和响应所有内容"></a>三、查看请求和响应所有内容</h3><p><code>curl -v 其中 -v 是--verbose的缩写</code></p>
<h3 id="四、解析host"><a href="#四、解析host" class="headerlink" title="四、解析host"></a>四、解析host</h3><p>可能有的时候，我们不想改下机器的hosts文件，可以使用curl的–resolve 选项来指定host的解析</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line">curl --resolve HOST:PORT:ADDRESS</span><br><span class="line">如：curl --resolve www.findme.wang:80:60.205.21.85 http://www.findme.wang</span><br></pre></td></tr></table></figure>
<h3 id="五、指定证书"><a href="#五、指定证书" class="headerlink" title="五、指定证书"></a>五、指定证书</h3><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line">curl -cacert</span><br><span class="line">如：curl --cacert conf/test.pem https://127.0.0.1:443</span><br></pre></td></tr></table></figure>
<h3 id="六、实例"><a href="#六、实例" class="headerlink" title="六、实例"></a>六、实例</h3><p>1、参数值中带单引号的post请求，换行用“\”</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br></pre></td><td class="code"><pre><span class="line">curl --location --request POST 'http://localhost:8080/api/admin/movie/ups/search/label/content' \</span><br><span class="line">--header 'Content-Type: application/json' \</span><br><span class="line">--data-raw '{</span><br><span class="line"> "taskId": 130,</span><br><span class="line"> "taskName": "20岁以下人群用户id",</span><br><span class="line"> "desc": "年龄=20岁以下",</span><br><span class="line"> "expr": "age_range in ('\''0'\'')",</span><br><span class="line"> "type": 0,</span><br><span class="line"> "channel": "'\’'sdsdfa'\''",</span><br><span class="line"> "search": "user_id",</span><br><span class="line"> "num": 31749</span><br><span class="line">}'</span><br></pre></td></tr></table></figure>
<p>2、get请求<br><code>curl -X GET --header 'Accept: application/json' 'http://localhost:8080/api/label/channel'</code></p>
<h3 id="参考"><a href="#参考" class="headerlink" title="参考"></a>参考</h3><p><a href="http://www.findme.wang/blog/detail/id/287.html" target="_blank" rel="noopener">http://www.findme.wang/blog/detail/id/287.html</a></p>
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<a class="article-title" href="/2018/05/07/%E4%BD%A0%E5%BA%94%E8%AF%A5%E7%9F%A5%E9%81%93%E7%9A%84HTTPS%E7%9F%A5%E8%AF%86/">你应该知道的HTTPS知识</a>
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<h3 id="1-为什么会有https？"><a href="#1-为什么会有https？" class="headerlink" title="1.为什么会有https？"></a>1.为什么会有https？</h3><ul>
<li>HTTP有以下缺点:<br>1、通信使用明文（不加密），内容可能被窃听;<br>2、不验证通信方的身份，因此可能遭遇伪装;<br>3、无法验证报文的完整性，所以可能已经遭到篡改</li>
<li>建立一个信息安全通道，来保证数据传输的安全</li>
<li>确认网站的真实性，防止钓鱼网站</li>
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<h3 id="2-https是什么？"><a href="#2-https是什么？" class="headerlink" title="2.https是什么？"></a>2.https是什么？</h3><p>HTTP+ 加密 + 认证 + 完整性保护 =HTTPS（HTTP Secure）<br>防止被窃听的对策中，最普及的就是加密技术，包括对通信的加密和对内容的加密。</p>
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<time datetime="2018-02-24T07:13:26.000Z" itemprop="datePublished"><i class="icon-calendar icon"></i>2018-02-24</time>
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<p>Welcome to <a href="https://hexo.io/" target="_blank" rel="noopener">Hexo</a>! This is your very first post. Check <a href="https://hexo.io/docs/" target="_blank" rel="noopener">documentation</a> for more info. If you get any problems when using Hexo, you can find the answer in <a href="https://hexo.io/docs/troubleshooting.html" target="_blank" rel="noopener">troubleshooting</a> or you can ask me on <a href="https://github.com/hexojs/hexo/issues" target="_blank" rel="noopener">GitHub</a>.</p>
<h2 id="Quick-Start"><a href="#Quick-Start" class="headerlink" title="Quick Start"></a>Quick Start</h2><h3 id="Create-a-new-post"><a href="#Create-a-new-post" class="headerlink" title="Create a new post"></a>Create a new post</h3><figure class="highlight bash"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">$ hexo new <span class="string">"My New Post"</span></span><br></pre></td></tr></table></figure>
<p>More info: <a href="https://hexo.io/docs/writing.html" target="_blank" rel="noopener">Writing</a></p>
<h3 id="Run-server"><a href="#Run-server" class="headerlink" title="Run server"></a>Run server</h3><figure class="highlight bash"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">$ hexo server</span><br></pre></td></tr></table></figure>
<p>More info: <a href="https://hexo.io/docs/server.html" target="_blank" rel="noopener">Server</a></p>
<h3 id="Generate-static-files"><a href="#Generate-static-files" class="headerlink" title="Generate static files"></a>Generate static files</h3><figure class="highlight bash"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">$ hexo generate</span><br></pre></td></tr></table></figure>
<p>More info: <a href="https://hexo.io/docs/generating.html" target="_blank" rel="noopener">Generating</a></p>
<h3 id="Deploy-to-remote-sites"><a href="#Deploy-to-remote-sites" class="headerlink" title="Deploy to remote sites"></a>Deploy to remote sites</h3><figure class="highlight bash"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">$ hexo deploy</span><br></pre></td></tr></table></figure>
<p>More info: <a href="https://hexo.io/docs/deployment.html" target="_blank" rel="noopener">Deployment</a></p>
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缺失模块。<br/>1、请确保node版本大于6.2<br/>2、在博客根目录（注意不是yilia根目录）执行以下命令：<br/> npm i hexo-generator-json-content --save<br/><br/>
3、在根目录_config.yml里添加配置：
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