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<p>通过阅读阮一峰老师的两篇文章,进行笔记的抄录,来加深自己对于 RESTful的理解</p>
<h2 id="深入理解RESTful"><a href="#深入理解RESTful" class="headerlink" title="深入理解RESTful"></a>深入理解RESTful</h2><p>RESTful 架构是目前最流行的一种互联网软件架构,它结构清晰、符合标准、易于理解、扩展方便,所以得到越来越多网站的采用。那么,到底什么叫做 RESTful 架构呢?</p>
<h3 id="RESTful-架构"><a href="#RESTful-架构" class="headerlink" title="RESTful 架构"></a>RESTful 架构</h3><h4 id="起源"><a href="#起源" class="headerlink" title="起源"></a><strong>起源</strong></h4><p>REST这个词,是<a href="http://en.wikipedia.org/wiki/Roy_Fielding">Roy Thomas Fielding</a>在他2000年的<a href="http://www.ics.uci.edu/~fielding/pubs/dissertation/top.htm">博士论文</a>中提出的。</p>
<h4 id="名称"><a href="#名称" class="headerlink" title="名称"></a><strong>名称</strong></h4><p>Fielding将他对互联网软件的架构原则,定名为REST,即Representational State Transfer的缩写。我对这个词组的翻译是”表现层状态转化”。</p>
<h4 id="资源(Resources)"><a href="#资源(Resources)" class="headerlink" title="资源(Resources)"></a><strong>资源(Resources)</strong></h4><p>REST的名称”表现层状态转化”中,省略了主语。”表现层”其实指的是”资源”(Resources)的”表现层”。</p>
<p>所谓的“资源”,就是网络上的一个实体,或者说是网络上的一个具体信息,它可以是一段文本、一张图片,一首歌,一种服务,总之就是一个具体的存在。可以用一个 URI (统一资源定位符)指向它,每种资源对应一个特定的 URI ,要获取这个资源,访问它的 URI 就可以,因而 URI 就成了每一个资源的地址或者收拾独一无二的识别符。</p>
<h4 id="表现层(Representation)"><a href="#表现层(Representation)" class="headerlink" title="表现层(Representation)"></a><strong>表现层(Representation)</strong></h4><p>“资源”是一种消息实体,可以有多种外在表现形式,把“资源”具体呈现出来的形式,叫做它的“表现层”</p>
<p>例如:文本可以用 txt 格式表现,也可以用 HTML 格式、XML 格式、JSON 格式表现,甚至可以采用二进制格式,图片可以用 JPG 格式表现,也可以用 PNG 格式表现。</p>
<p>URI 只代表资源的实体,不代表它的形式,严格地说,有些网站最后的“.html”后缀名是不必要的,因为这个后缀名表示格式,属于“表现层”的范畴,而 URI 应该只代表“资源”的位置。它的具体表现形式,应该在 HTTP 请求的头部信息中用 Accept 和 Content-Type 字段来指定,这两个字段才是对“表现层”的描述。</p>
<h4 id="状态转化(state-Transfer)"><a href="#状态转化(state-Transfer)" class="headerlink" title="状态转化(state Transfer)"></a><strong>状态转化(state Transfer)</strong></h4><p>访问一个网站,就代表了客户端和服务器的一个互动的过程,在这个过程中,就会涉及到数据和状态的变化。</p>
<p>互联网通信协议 HTTP 协议,是一个无状态协议。这意味着,所有的状态都保存在服务器端,因此,如果客户端想要操作服务器,必须通过某种手段,让服务器端发生“状态转化(State Transfer)” 。而这种转化是建立在表现层之上的,所以就是“表现层状态转化”</p>
<p>客户端用到的手段,只能是 HTTP 协议,具体来说,就是 HTTP 协议里面,四个表示操作的动词: GET/POST/PUT/DELETE。它们分别对应四种基本操作:获取/新建(更新)/更新/删除 资源</p>
<h4 id="综述"><a href="#综述" class="headerlink" title="综述"></a><strong>综述</strong></h4><p>RESTful 就是</p>
<ol>
<li>每一个 URI 代表一个资源</li>
<li>客户端与服务器之间,传递这种资源的某种表现层</li>
<li>客户端通过四个 HTTP 动词,对服务端资源进行操作,实现”表现层状态转化“</li>
</ol>
<h4 id="误区"><a href="#误区" class="headerlink" title="误区"></a><strong>误区</strong></h4><p>RESTful 架构有一些典型的设计误区</p>
<p><strong>最常见的设计误区,就是 URI 中包含动词</strong>。因为“资源”是一种实体,所以应该是名称,URI 不应该有动词,动词应该放在 HTTP 协议中。</p>
<p>例子:</p>
<blockquote>
<p>URI: /posts/show/1 </p>
</blockquote>
<p>其中 show 是动词,这个 URI 设计就错误了,正确的应该是</p>
<blockquote>
<p>URI: /posts/1</p>
</blockquote>
<p>然后用 GET 表示 show</p>
<p>如果某些动作是HTTP动词表示不了的,你就应该把动作做成一种资源。比如网上汇款,从账户1向账户2汇款500元,错误的URI是:</p>
<figure class="highlight"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">POST /accounts/1/transfer/500/to/2</span><br></pre></td></tr></table></figure>
<p>正确的写法是把动词transfer改成名词transaction,资源不能是动词,但是可以是一种服务:</p>
<figure class="highlight"><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"><span class="keyword">POST</span> <span class="string">/transaction</span> HTTP/1.1</span><br><span class="line"><span class="attribute">Host</span>: 127.0.0.1</span><br><span class="line">from=1&to=2&amount=500.00</span><br></pre></td></tr></table></figure>
<p><strong>另一个设计误区,就是在URI中加入版本号</strong>:</p>
<blockquote>
<p> <a href="http://www.example.com/app/1.0/foo">http://www.example.com/app/1.0/foo</a></p>
<p> <a href="http://www.example.com/app/1.1/foo">http://www.example.com/app/1.1/foo</a></p>
<p> <a href="http://www.example.com/app/2.0/foo">http://www.example.com/app/2.0/foo</a></p>
</blockquote>
<p>因为不同的版本,可以理解成同一种资源的不同表现形式,所以应该采用同一个URI。版本号可以在HTTP请求头信息的Accept字段中进行区分(参见<a href="http://www.informit.com/articles/article.aspx?p=1566460">Versioning REST Services</a>):</p>
<blockquote>
<p> Accept: vnd.example-com.foo+json; version=1.0</p>
<p> Accept: vnd.example-com.foo+json; version=1.1</p>
<p> Accept: vnd.example-com.foo+json; version=2.0</p>
</blockquote>
<h3 id="RESTful-API-最佳实践"><a href="#RESTful-API-最佳实践" class="headerlink" title="RESTful API 最佳实践"></a>RESTful API 最佳实践</h3><h4 id="URI-设计"><a href="#URI-设计" class="headerlink" title="URI 设计"></a><strong>URI 设计</strong></h4><p><strong>动词 + 宾语</strong></p>
<p>RESTful 的 核心思想就是,客户端发出的数据操作指令都是 “动词+宾语”的结构,比如</p>
<p><code>GET/articles</code>这个命令,<code>GET</code>是动词,<code>/articles</code>是宾语</p>
<p>动词通常就是五种 HTTP 方法,对应 CRUD(Create增加|Retrieve读取查询|Update更新|Delete删除) 操作</p>
<blockquote>
<ul>
<li>GET :读取(Read)</li>
<li>POST:新建(Create)</li>
<li>PUT:更新(Update)</li>
<li>PATCH:更新(Update),通常是部分更新</li>
<li>DELETE:删除(Delete)</li>
</ul>
</blockquote>
<p>根据 HTTP 规范,动词一律大写。</p>
<p><strong>动词的覆盖</strong></p>
<p>有些客户端只能使用 <code>GET</code>和 <code>POST</code>这两种方法,服务器必须接受 <code>POST</code>模拟其他三个方法(<code>PUT</code>、<code>PATCH</code>、<code>DELETE</code>)</p>
<p>这时客户端发出的 HTTP 请求,要加上 <code>X-HTTP-Method-Override</code>属性,告诉服务器应该使用哪一个动词,覆盖 <code>POST</code>方法</p>
<figure class="highlight http"><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"><span class="keyword">POST</span> <span class="string">/api/Person/4</span> HTTP/1.1</span><br><span class="line"><span class="attribute">X-HTTP-Method-Override</span>: PUT</span><br></pre></td></tr></table></figure>
<p>上面代码中,<code>X-HTTP-Method-Override</code>指定本次请求的方法是<code>PUT</code>,而不是<code>POST</code>。</p>
<p><strong>宾语必须是名词</strong></p>
<p>宾语就是 API 的URI ,是 HTTP 动词作用的对象,它应该是名词,不能是动词,比如 <code>/articles</code>这个 URL 就是正确的,而下面的 URL 不是名词,所以都是错误的</p>
<blockquote>
<ul>
<li>/getAllCars</li>
<li>/createNewCar</li>
<li>/deleteAllRedCars</li>
</ul>
</blockquote>
<p><strong>复数 URL</strong></p>
<p>既然 URL 是名词,那么应该使用复数,还是单数?</p>
<p>这没有统一的规定,但是常见的操作是读取一个集合,比如<code>GET /articles</code>(读取所有文章),这里明显应该是复数。</p>
<p>为了统一起见,建议都使用复数 URL,比如<code>GET /articles/2</code>要好于<code>GET /article/2</code>。</p>
<p><strong>避免多级 URL</strong></p>
<p>常见的情况是,资源需要多级分类,因此很容易写出多级的 URL,比如获取某个作者的某一类文章。</p>
<figure class="highlight"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">GET /authors/12/categories/2</span><br></pre></td></tr></table></figure>
<p>这种 URL 不利于扩展,语义也不明确,往往要想一会,才能明白含义。</p>
<p>更好的做法是,除了第一级,其他级别都用查询字符串表达。</p>
<figure class="highlight"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">GET /authors/12?categories=2</span><br></pre></td></tr></table></figure>
<p>下面是另一个例子,查询已发布的文章。你可能会设计成下面的 URL。</p>
<figure class="highlight"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">GET /articles/published</span><br></pre></td></tr></table></figure>
<p>查询字符串的写法明显更好。</p>
<figure class="highlight"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">GET /articles?published=true</span><br></pre></td></tr></table></figure>
<h4 id="状态码"><a href="#状态码" class="headerlink" title="状态码"></a><strong>状态码</strong></h4><p><strong>状态码必须精确</strong></p>
<p>客户端的每一次请求,服务器都必须给出回应。回应包括 HTTP 状态码和数据两部分。</p>
<p>HTTP 状态码就是一个三位数,分成五个类别。</p>
<ul>
<li><code>1xx</code>:相关信息</li>
<li><code>2xx</code>:操作成功</li>
<li><code>3xx</code>:重定向</li>
<li><code>4xx</code>:客户端错误</li>
<li><code>5xx</code>:服务器错误</li>
</ul>
<p><strong>2xx 状态码</strong></p>
<p><code>200</code>状态码表示操作成功,但是不同的方法可以返回更精确的状态码。</p>
<ul>
<li>GET: 200 OK</li>
<li>POST: 201 Created</li>
<li>PUT: 200 OK</li>
<li>PATCH: 200 OK</li>
<li>DELETE: 204 No Content</li>
</ul>
<p>上面代码中,<code>POST</code>返回<code>201</code>状态码,表示生成了新的资源;<code>DELETE</code>返回<code>204</code>状态码,表示资源已经不存在。</p>
<p>此外,<code>202 Accepted</code>状态码表示服务器已经收到请求,但还未进行处理,会在未来再处理,通常用于异步操作。下面是一个例子。</p>
<figure class="highlight"><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></pre></td><td class="code"><pre><span class="line">HTTP/1.1 <span class="number">202</span> Accepted</span><br><span class="line"></span><br><span class="line">{</span><br><span class="line"> "task": {</span><br><span class="line"> "href": "/api/company/job-management/jobs/2130040",</span><br><span class="line"> "id": "2130040"</span><br><span class="line"> }</span><br><span class="line">}</span><br></pre></td></tr></table></figure>
<p><strong>3xx 状态码</strong></p>
<p>API 用不到<code>301</code>状态码(永久重定向)和<code>302</code>状态码(暂时重定向,<code>307</code>也是这个含义),因为它们可以由应用级别返回,浏览器会直接跳转,API 级别可以不考虑这两种情况。</p>
<p>API 用到的<code>3xx</code>状态码,主要是<code>303 See Other</code>,表示参考另一个 URL。它与<code>302</code>和<code>307</code>的含义一样,也是”暂时重定向”,区别在于<code>302</code>和<code>307</code>用于<code>GET</code>请求,而<code>303</code>用于<code>POST</code>、<code>PUT</code>和<code>DELETE</code>请求。收到<code>303</code>以后,浏览器不会自动跳转,而会让用户自己决定下一步怎么办。下面是一个例子。</p>
<figure class="highlight http"><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">HTTP/1.1 <span class="number">303</span> See Other</span><br><span class="line"><span class="attribute">Location</span>: /api/orders/12345</span><br></pre></td></tr></table></figure>
<p><strong>4xx 状态码</strong></p>
<p><code>4xx</code>状态码表示客户端错误,主要有下面几种。</p>
<p><code>400 Bad Request</code>:服务器不理解客户端的请求,未做任何处理。</p>
<p><code>401 Unauthorized</code>:用户未提供身份验证凭据,或者没有通过身份验证。</p>
<p><code>403 Forbidden</code>:用户通过了身份验证,但是不具有访问资源所需的权限。</p>
<p><code>404 Not Found</code>:所请求的资源不存在,或不可用。</p>
<p><code>405 Method Not Allowed</code>:用户已经通过身份验证,但是所用的 HTTP 方法不在他的权限之内。</p>
<p><code>410 Gone</code>:所请求的资源已从这个地址转移,不再可用。</p>
<p><code>415 Unsupported Media Type</code>:客户端要求的返回格式不支持。比如,API 只能返回 JSON 格式,但是客户端要求返回 XML 格式。</p>
<p><code>422 Unprocessable Entity</code> :客户端上传的附件无法处理,导致请求失败。</p>
<p><code>429 Too Many Requests</code>:客户端的请求次数超过限额。</p>
<p><strong>5xx 状态码</strong></p>
<p><code>5xx</code>状态码表示服务端错误。一般来说,API 不会向用户透露服务器的详细信息,所以只要两个状态码就够了。</p>
<p><code>500 Internal Server Error</code>:客户端请求有效,服务器处理时发生了意外。</p>
<p><code>503 Service Unavailable</code>:服务器无法处理请求,一般用于网站维护状态。</p>
<h4 id="服务器回应"><a href="#服务器回应" class="headerlink" title="服务器回应"></a><strong>服务器回应</strong></h4><p><strong>不要返回纯本文</strong></p>
<p>API 返回的数据格式,不应该是纯文本,而应该是一个 JSON 对象,因为这样才能返回标准的结构化数据。所以,服务器回应的 HTTP 头的<code>Content-Type</code>属性要设为<code>application/json</code>。</p>
<p>客户端请求时,也要明确告诉服务器,可以接受 JSON 格式,即请求的 HTTP 头的<code>ACCEPT</code>属性也要设成<code>application/json</code>。下面是一个例子。</p>
<figure class="highlight http"><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"><span class="keyword">GET</span> <span class="string">/orders/2</span> HTTP/1.1</span><br><span class="line"><span class="attribute">Accept</span>: application/json</span><br></pre></td></tr></table></figure>
<p><strong>发生错误时,不要返回 200 状态码</strong></p>
<p>有一种不恰当的做法是,即使发生错误,也返回<code>200</code>状态码,把错误信息放在数据体里面,就像下面这样。</p>
<figure class="highlight"><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></pre></td><td class="code"><pre><span class="line">HTTP/1.1 <span class="number">200</span> OK</span><br><span class="line"><span class="attribute">Content-Type</span>: application/json</span><br><span class="line"></span><br><span class="line">{</span><br><span class="line"> "status": "failure",</span><br><span class="line"> "data": {</span><br><span class="line"> "error": "Expected at least two items in list."</span><br><span class="line"> }</span><br><span class="line">}</span><br></pre></td></tr></table></figure>
<p>上面代码中,解析数据体以后,才能得知操作失败。</p>
<p>这张做法实际上取消了状态码,这是完全不可取的。正确的做法是,状态码反映发生的错误,具体的错误信息放在数据体里面返回。下面是一个例子。</p>
<figure class="highlight"><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></pre></td><td class="code"><pre><span class="line">HTTP/1.1 <span class="number">400</span> Bad Request</span><br><span class="line"><span class="attribute">Content-Type</span>: application/json</span><br><span class="line"></span><br><span class="line">{</span><br><span class="line"> "error": "Invalid payoad.",</span><br><span class="line"> "detail": {</span><br><span class="line"> "surname": "This field is required."</span><br><span class="line"> }</span><br><span class="line">}</span><br></pre></td></tr></table></figure>
<p><strong>提供链接</strong></p>
<p>API 的使用者未必知道,URL 是怎么设计的。一个解决方法就是,在回应中,给出相关链接,便于下一步操作。这样的话,用户只要记住一个 URL,就可以发现其他的 URL。这种方法叫做 HATEOAS。</p>
<p>举例来说,GitHub 的 API 都在 <a href="https://api.github.com/">api.github.com</a> 这个域名。访问它,就可以得到其他 URL。</p>
<figure class="highlight"><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></pre></td><td class="code"><pre><span class="line">{</span><br><span class="line"> ...</span><br><span class="line"> "feeds_url": "https://api.github.com/feeds",</span><br><span class="line"> "followers_url": "https://api.github.com/user/followers",</span><br><span class="line"> "following_url": "https://api.github.com/user/following{/target}",</span><br><span class="line"> "gists_url": "https://api.github.com/gists{/gist_id}",</span><br><span class="line"> "hub_url": "https://api.github.com/hub",</span><br><span class="line"> ...</span><br><span class="line">}</span><br></pre></td></tr></table></figure>
<p>上面的回应中,挑一个 URL 访问,又可以得到别的 URL。对于用户来说,不需要记住 URL 设计,只要从 api.github.com 一步步查找就可以了。</p>
<p>HATEOAS 的格式没有统一规定,上面例子中,GitHub 将它们与其他属性放在一起。更好的做法应该是,将相关链接与其他属性分开。</p>
<figure class="highlight"><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></pre></td><td class="code"><pre><span class="line">HTTP/1.1 <span class="number">200</span> OK</span><br><span class="line"><span class="attribute">Content-Type</span>: application/json</span><br><span class="line"></span><br><span class="line">{</span><br><span class="line"> "status": "In progress",</span><br><span class="line"> "links": {[</span><br><span class="line"> { "rel":"cancel", "method": "delete", "href":"/api/status/12345" } ,</span><br><span class="line"> { "rel":"edit", "method": "put", "href":"/api/status/12345" }</span><br><span class="line"> ]}</span><br><span class="line">}</span><br></pre></td></tr></table></figure>
<p>想了解更多详情的,可以点击</p>
<ul>
<li><a href="https://godruoyi.com/posts/resetful-api-design-specifications">RESETful API 设计规范</a></li>
<li><a href="http://www.cnblogs.com/artech/p/restful-web-api-01.html">我所理解的RESTful Web API [Web标准篇]</a></li>
<li><a href="https://www.cnblogs.com/artech/p/3506553.html">我所理解的RESTful Web API [设计篇]</a></li>
</ul>
<h3 id="参考链接"><a href="#参考链接" class="headerlink" title="参考链接"></a>参考链接</h3><ol>
<li><a href="http://www.ruanyifeng.com/blog/2011/09/restful.html">理解RESTful架构-阮一峰</a></li>
<li><a href="http://www.ruanyifeng.com/blog/2018/10/restful-api-best-practices.html">RESTful API 最佳实践</a></li>
</ol>
</div>
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赖彬鸿
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<div class="post-toc-content"><ol class="nav"><li class="nav-item nav-level-2"><a class="nav-link" href="#深入理解RESTful"><span class="nav-number">1.</span> <span class="nav-text">深入理解RESTful</span></a><ol class="nav-child"><li class="nav-item nav-level-3"><a class="nav-link" href="#RESTful-架构"><span class="nav-number">1.1.</span> <span class="nav-text">RESTful 架构</span></a><ol class="nav-child"><li class="nav-item nav-level-4"><a class="nav-link" href="#起源"><span class="nav-number">1.1.1.</span> <span class="nav-text">起源</span></a></li><li class="nav-item nav-level-4"><a class="nav-link" href="#名称"><span class="nav-number">1.1.2.</span> <span class="nav-text">名称</span></a></li><li class="nav-item nav-level-4"><a class="nav-link" href="#资源(Resources)"><span class="nav-number">1.1.3.</span> <span class="nav-text">资源(Resources)</span></a></li><li class="nav-item nav-level-4"><a class="nav-link" href="#表现层(Representation)"><span class="nav-number">1.1.4.</span> <span class="nav-text">表现层(Representation)</span></a></li><li class="nav-item nav-level-4"><a class="nav-link" href="#状态转化(state-Transfer)"><span class="nav-number">1.1.5.</span> <span class="nav-text">状态转化(state Transfer)</span></a></li><li class="nav-item nav-level-4"><a class="nav-link" href="#综述"><span class="nav-number">1.1.6.</span> <span class="nav-text">综述</span></a></li><li class="nav-item nav-level-4"><a class="nav-link" href="#误区"><span class="nav-number">1.1.7.</span> <span class="nav-text">误区</span></a></li></ol></li><li class="nav-item nav-level-3"><a class="nav-link" href="#RESTful-API-最佳实践"><span class="nav-number">1.2.</span> <span class="nav-text">RESTful API 最佳实践</span></a><ol class="nav-child"><li class="nav-item nav-level-4"><a class="nav-link" href="#URI-设计"><span class="nav-number">1.2.1.</span> <span class="nav-text">URI 设计</span></a></li><li class="nav-item nav-level-4"><a class="nav-link" href="#状态码"><span class="nav-number">1.2.2.</span> <span class="nav-text">状态码</span></a></li><li class="nav-item nav-level-4"><a class="nav-link" href="#服务器回应"><span class="nav-number">1.2.3.</span> <span class="nav-text">服务器回应</span></a></li></ol></li><li class="nav-item nav-level-3"><a class="nav-link" href="#参考链接"><span class="nav-number">1.3.</span> <span class="nav-text">参考链接</span></a></li></ol></li></ol></div>
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