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  19.   <span><svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15" class="icon outbound"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path> <polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg> <span class="sr-only">(opens new window)</span></span></a></div><div class="nav-item"><div class="dropdown-wrapper"><button type="button" aria-label="前端" class="dropdown-title"><a href="/blog/web/" class="link-title">前端</a> <span class="title" style="display:none;">前端</span> <span class="arrow right"></span></button> <ul class="nav-dropdown" style="display:none;"><li class="dropdown-item"><h4>前端文章</h4> <ul class="dropdown-subitem-wrapper"><li class="dropdown-subitem"><a href="/blog/pages/8143cc480faf9a11/" class="nav-link">JavaScript</a></li></ul></li><li class="dropdown-item"><h4>学习笔记</h4> <ul class="dropdown-subitem-wrapper"><li class="dropdown-subitem"><a href="/blog/note/javascript/" class="nav-link">《JavaScript教程》</a></li><li class="dropdown-subitem"><a href="/blog/note/js/" class="nav-link">《JavaScript高级程序设计》</a></li><li class="dropdown-subitem"><a href="/blog/note/es6/" class="nav-link">《ES6 教程》</a></li><li class="dropdown-subitem"><a href="/blog/note/vue/" class="nav-link">《Vue》</a></li><li class="dropdown-subitem"><a href="/blog/note/react/" class="nav-link">《React》</a></li><li class="dropdown-subitem"><a href="/blog/note/typescript-axios/" class="nav-link">《TypeScript 从零实现 axios》</a></li><li class="dropdown-subitem"><a href="/blog/note/git/" class="nav-link">《Git》</a></li><li class="dropdown-subitem"><a href="/blog/pages/51afd6/" class="nav-link">TypeScript</a></li><li class="dropdown-subitem"><a href="/blog/pages/4643cd/" class="nav-link">JS设计模式总结</a></li></ul></li></ul></div></div><div class="nav-item"><div class="dropdown-wrapper"><button type="button" aria-label="页面" class="dropdown-title"><a href="/blog/ui/" class="link-title">页面</a> <span class="title" style="display:none;">页面</span> <span class="arrow right"></span></button> <ul class="nav-dropdown" style="display:none;"><li class="dropdown-item"><!----> <a href="/blog/pages/8309a5b876fc95e3/" class="nav-link">HTML</a></li><li class="dropdown-item"><!----> <a href="/blog/pages/0a83b083bdf257cb/" class="nav-link">CSS</a></li></ul></div></div><div class="nav-item"><div class="dropdown-wrapper"><button type="button" aria-label="技术" class="dropdown-title"><a href="/blog/technology/" class="link-title">技术</a> <span class="title" style="display:none;">技术</span> <span class="arrow right"></span></button> <ul class="nav-dropdown" style="display:none;"><li class="dropdown-item"><!----> <a href="/blog/pages/9a7ee40fc232253e/" class="nav-link">技术文档</a></li><li class="dropdown-item"><!----> <a href="/blog/pages/4c778760be26d8b3/" class="nav-link">GitHub技巧</a></li><li class="dropdown-item"><!----> <a href="/blog/pages/117708e0af7f0bd9/" class="nav-link">Nodejs</a></li><li class="dropdown-item"><!----> <a href="/blog/pages/41f87d890d0a02af/" class="nav-link">博客搭建</a></li></ul></div></div><div class="nav-item"><div class="dropdown-wrapper"><button type="button" aria-label="更多" class="dropdown-title"><a href="/blog/more/" class="link-title">更多</a> <span class="title" style="display:none;">更多</span> <span class="arrow right"></span></button> <ul class="nav-dropdown" style="display:none;"><li class="dropdown-item"><!----> <a href="/blog/pages/f2a556/" class="nav-link">学习</a></li><li class="dropdown-item"><!----> <a href="/blog/pages/aea6571b7a8bae86/" class="nav-link">面试</a></li><li class="dropdown-item"><!----> <a href="/blog/pages/2d615df9a36a98ed/" class="nav-link">心情杂货</a></li><li class="dropdown-item"><!----> <a href="/blog/pages/baaa02/" class="nav-link">实用技巧</a></li><li class="dropdown-item"><!----> <a href="/blog/friends/" class="nav-link">友情链接</a></li></ul></div></div><div class="nav-item"><a href="/blog/about/" class="nav-link">关于</a></div><div class="nav-item"><a href="/blog/pages/beb6c0bd8a66cea6/" class="nav-link">收藏</a></div><div class="nav-item"><div class="dropdown-wrapper"><button type="button" aria-label="索引" class="dropdown-title"><a href="/blog/archives/" class="link-title">索引</a> <span class="title" style="display:none;">索引</span> <span class="arrow right"></span></button> <ul class="nav-dropdown" style="display:none;"><li class="dropdown-item"><!----> <a href="/blog/categories/" class="nav-link">分类</a></li><li class="dropdown-item"><!----> <a href="/blog/tags/" class="nav-link">标签</a></li><li class="dropdown-item"><!----> <a href="/blog/archives/" class="nav-link">归档</a></li></ul></div></div> <a href="https://github.com/heBody/blog" target="_blank" rel="noopener noreferrer" class="repo-link">
    20. 

  20.     GitHub
    21. 

  21.     <span><svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15" class="icon outbound"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path> <polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg> <span class="sr-only">(opens new window)</span></span></a></nav></div></header> <div class="sidebar-mask"></div> <div class="sidebar-hover-trigger"></div> <aside class="sidebar" style="display:none;"><div class="blogger"><img src="https://fastly.jsdelivr.net/gh/xugaoyi/image_store/blog/20200103123203.jpg"> <div class="blogger-info"><h3>彪哥</h3> <span>爱好前端</span></div></div> <nav class="nav-links"><div class="nav-item"><a href="/blog/" class="nav-link">首页</a></div><div class="nav-item"><a href="http://fseller.com" target="_blank" rel="noopener noreferrer" class="nav-link external">
    22. 

  22.   个人游戏网站
    23. 

  23.   <span><svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15" class="icon outbound"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path> <polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg> <span class="sr-only">(opens new window)</span></span></a></div><div class="nav-item"><div class="dropdown-wrapper"><button type="button" aria-label="前端" class="dropdown-title"><a href="/blog/web/" class="link-title">前端</a> <span class="title" style="display:none;">前端</span> <span class="arrow right"></span></button> <ul class="nav-dropdown" style="display:none;"><li class="dropdown-item"><h4>前端文章</h4> <ul class="dropdown-subitem-wrapper"><li class="dropdown-subitem"><a href="/blog/pages/8143cc480faf9a11/" class="nav-link">JavaScript</a></li></ul></li><li class="dropdown-item"><h4>学习笔记</h4> <ul class="dropdown-subitem-wrapper"><li class="dropdown-subitem"><a href="/blog/note/javascript/" class="nav-link">《JavaScript教程》</a></li><li class="dropdown-subitem"><a href="/blog/note/js/" class="nav-link">《JavaScript高级程序设计》</a></li><li class="dropdown-subitem"><a href="/blog/note/es6/" class="nav-link">《ES6 教程》</a></li><li class="dropdown-subitem"><a href="/blog/note/vue/" class="nav-link">《Vue》</a></li><li class="dropdown-subitem"><a href="/blog/note/react/" class="nav-link">《React》</a></li><li class="dropdown-subitem"><a href="/blog/note/typescript-axios/" class="nav-link">《TypeScript 从零实现 axios》</a></li><li class="dropdown-subitem"><a href="/blog/note/git/" class="nav-link">《Git》</a></li><li class="dropdown-subitem"><a href="/blog/pages/51afd6/" class="nav-link">TypeScript</a></li><li class="dropdown-subitem"><a href="/blog/pages/4643cd/" class="nav-link">JS设计模式总结</a></li></ul></li></ul></div></div><div class="nav-item"><div class="dropdown-wrapper"><button type="button" aria-label="页面" class="dropdown-title"><a href="/blog/ui/" class="link-title">页面</a> <span class="title" style="display:none;">页面</span> <span class="arrow right"></span></button> <ul class="nav-dropdown" style="display:none;"><li class="dropdown-item"><!----> <a href="/blog/pages/8309a5b876fc95e3/" class="nav-link">HTML</a></li><li class="dropdown-item"><!----> <a href="/blog/pages/0a83b083bdf257cb/" class="nav-link">CSS</a></li></ul></div></div><div class="nav-item"><div class="dropdown-wrapper"><button type="button" aria-label="技术" class="dropdown-title"><a href="/blog/technology/" class="link-title">技术</a> <span class="title" style="display:none;">技术</span> <span class="arrow right"></span></button> <ul class="nav-dropdown" style="display:none;"><li class="dropdown-item"><!----> <a href="/blog/pages/9a7ee40fc232253e/" class="nav-link">技术文档</a></li><li class="dropdown-item"><!----> <a href="/blog/pages/4c778760be26d8b3/" class="nav-link">GitHub技巧</a></li><li class="dropdown-item"><!----> <a href="/blog/pages/117708e0af7f0bd9/" class="nav-link">Nodejs</a></li><li class="dropdown-item"><!----> <a href="/blog/pages/41f87d890d0a02af/" class="nav-link">博客搭建</a></li></ul></div></div><div class="nav-item"><div class="dropdown-wrapper"><button type="button" aria-label="更多" class="dropdown-title"><a href="/blog/more/" class="link-title">更多</a> <span class="title" style="display:none;">更多</span> <span class="arrow right"></span></button> <ul class="nav-dropdown" style="display:none;"><li class="dropdown-item"><!----> <a href="/blog/pages/f2a556/" class="nav-link">学习</a></li><li class="dropdown-item"><!----> <a href="/blog/pages/aea6571b7a8bae86/" class="nav-link">面试</a></li><li class="dropdown-item"><!----> <a href="/blog/pages/2d615df9a36a98ed/" class="nav-link">心情杂货</a></li><li class="dropdown-item"><!----> <a href="/blog/pages/baaa02/" class="nav-link">实用技巧</a></li><li class="dropdown-item"><!----> <a href="/blog/friends/" class="nav-link">友情链接</a></li></ul></div></div><div class="nav-item"><a href="/blog/about/" class="nav-link">关于</a></div><div class="nav-item"><a href="/blog/pages/beb6c0bd8a66cea6/" class="nav-link">收藏</a></div><div class="nav-item"><div class="dropdown-wrapper"><button type="button" aria-label="索引" class="dropdown-title"><a href="/blog/archives/" class="link-title">索引</a> <span class="title" style="display:none;">索引</span> <span class="arrow right"></span></button> <ul class="nav-dropdown" style="display:none;"><li class="dropdown-item"><!----> <a href="/blog/categories/" class="nav-link">分类</a></li><li class="dropdown-item"><!----> <a href="/blog/tags/" class="nav-link">标签</a></li><li class="dropdown-item"><!----> <a href="/blog/archives/" class="nav-link">归档</a></li></ul></div></div> <a href="https://github.com/heBody/blog" target="_blank" rel="noopener noreferrer" class="repo-link">
    24. 

  24.     GitHub
    25. 

  25.     <span><svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15" class="icon outbound"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path> <polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg> <span class="sr-only">(opens new window)</span></span></a></nav>  <ul class="sidebar-links"><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>初识 TypeScript</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>TypeScript 常用语法</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>ts-axios 项目初始化</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading open"><span>ts-axios 基础功能实现</span> <span class="arrow down"></span></p> <ul class="sidebar-links sidebar-group-items"><li><a href="/blog/pages/1313dae575f6dddf/" class="sidebar-link">处理请求 url 参数</a></li><li><a href="/blog/pages/887cd0918e2543d8/" class="sidebar-link">处理请求 body 数据</a></li><li><a href="/blog/pages/35c0ec1bb0b0faaf/" aria-current="page" class="active sidebar-link">处理请求 header</a><ul class="sidebar-sub-headers"><li class="sidebar-sub-header level2"><a href="/blog/pages/35c0ec1bb0b0faaf/#需求分析" class="sidebar-link">需求分析</a></li><li class="sidebar-sub-header level2"><a href="/blog/pages/35c0ec1bb0b0faaf/#processheaders-函数实现" class="sidebar-link">processHeaders 函数实现</a></li><li class="sidebar-sub-header level2"><a href="/blog/pages/35c0ec1bb0b0faaf/#实现请求-header-处理逻辑" class="sidebar-link">实现请求 header 处理逻辑</a></li><li class="sidebar-sub-header level2"><a href="/blog/pages/35c0ec1bb0b0faaf/#demo-编写" class="sidebar-link">demo 编写</a></li></ul></li><li><a href="/blog/pages/a57debe141e1e4f4/" class="sidebar-link">获取响应数据</a></li><li><a href="/blog/pages/927161662ca32c24/" class="sidebar-link">处理响应 header</a></li><li><a href="/blog/pages/922cb4268499dc3f/" class="sidebar-link">处理响应 data</a></li></ul></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>ts-axios 异常情况处理</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>ts-axios 接口扩展</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>ts-axios 拦截器实现</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>ts-axios 配置化实现</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>ts-axios 取消功能实现</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>ts-axios 更多功能实现</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>ts-axios 单元测试</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>ts-axios 部署与发布</span> <span class="arrow right"></span></p> <!----></section></li></ul> </aside> <div><main class="page"><div class="theme-vdoing-wrapper "><div class="articleInfo-wrap" data-v-06225672><div class="articleInfo" data-v-06225672><ul class="breadcrumbs" data-v-06225672><li data-v-06225672><a href="/blog/" title="首页" class="iconfont icon-home router-link-active" data-v-06225672></a></li> <li data-v-06225672><a href="/blog/note/typescript-axios/#《TypeScript 从零实现 axios》" data-v-06225672>《TypeScript 从零实现 axios》</a></li><li data-v-06225672><a href="/blog/note/typescript-axios/#ts-axios 基础功能实现" data-v-06225672>ts-axios 基础功能实现</a></li></ul> <div class="info" data-v-06225672><div title="作者" class="author iconfont icon-touxiang" data-v-06225672><a href="javascript:;" data-v-06225672>HuangYi</a></div> <div title="创建时间" class="date iconfont icon-riqi" data-v-06225672><a href="javascript:;" data-v-06225672>2020-01-05</a></div> <!----></div></div></div> <!----> <div class="content-wrapper"><div class="right-menu-wrapper"><div class="right-menu-margin"><div class="right-menu-title">目录</div> <div class="right-menu-content"></div></div></div> <h1><img src="data:image/png;base64,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">处理请求 header<!----></h1>  <div class="theme-vdoing-content content__default"><h1 id="处理请求-header"><a href="#处理请求-header" class="header-anchor">#</a> 处理请求 header</h1> <h2 id="需求分析"><a href="#需求分析" class="header-anchor">#</a> 需求分析</h2> <p>我们上节课遗留了一个问题：</p> <div class="language-typescript line-numbers-mode"><pre class="language-typescript"><code><span class="token function">axios</span><span class="token punctuation">(</span><span class="token punctuation">{</span>
    26. 

  26.   method<span class="token operator">:</span> <span class="token string">'post'</span><span class="token punctuation">,</span>
    27. 

  27.   url<span class="token operator">:</span> <span class="token string">'/base/post'</span><span class="token punctuation">,</span>
    28. 

  28.   data<span class="token operator">:</span> <span class="token punctuation">{</span>
    29. 

  29.     a<span class="token operator">:</span> <span class="token number">1</span><span class="token punctuation">,</span>
    30. 

  30.     b<span class="token operator">:</span> <span class="token number">2</span>
    31. 

  31.   <span class="token punctuation">}</span>
    32. 

  32. <span class="token punctuation">}</span><span class="token punctuation">)</span>
    33. 

  33. </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br></div></div><p>我们做了请求数据的处理，把 <code>data</code> 转换成了 JSON 字符串，但是数据发送到服务端的时候，服务端并不能正常解析我们发送的数据，因为我们并没有给请求 <code>header</code> 设置正确的 <code>Content-Type</code>。</p> <p>所以首先我们要支持发送请求的时候，可以支持配置 <code>headers</code> 属性，如下：</p> <div class="language-typescript line-numbers-mode"><pre class="language-typescript"><code><span class="token function">axios</span><span class="token punctuation">(</span><span class="token punctuation">{</span>
    34. 

  34.   method<span class="token operator">:</span> <span class="token string">'post'</span><span class="token punctuation">,</span>
    35. 

  35.   url<span class="token operator">:</span> <span class="token string">'/base/post'</span><span class="token punctuation">,</span>
    36. 

  36.   headers<span class="token operator">:</span> <span class="token punctuation">{</span>
    37. 

  37.     <span class="token string-property property">'content-type'</span><span class="token operator">:</span> <span class="token string">'application/json;charset=utf-8'</span>
    38. 

  38.   <span class="token punctuation">}</span><span class="token punctuation">,</span>
    39. 

  39.   data<span class="token operator">:</span> <span class="token punctuation">{</span>
    40. 

  40.     a<span class="token operator">:</span> <span class="token number">1</span><span class="token punctuation">,</span>
    41. 

  41.     b<span class="token operator">:</span> <span class="token number">2</span>
    42. 

  42.   <span class="token punctuation">}</span>
    43. 

  43. <span class="token punctuation">}</span><span class="token punctuation">)</span>
    44. 

  44. </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br></div></div><p>并且在当我们传入的 <code>data</code> 为普通对象的时候，<code>headers</code> 如果没有配置 <code>Content-Type</code> 属性，需要自动设置请求 <code>header</code> 的 <code>Content-Type</code> 字段为：<code>application/json;charset=utf-8</code>。</p> <h2 id="processheaders-函数实现"><a href="#processheaders-函数实现" class="header-anchor">#</a> processHeaders 函数实现</h2> <p>根据需求分析，我们要实现一个工具函数，对 request 中的 <code>headers</code> 做一层加工。我们在 <code>helpers</code> 目录新建 <code>headers.ts</code> 文件。</p> <p><code>helpers/headers.ts</code>：</p> <div class="language-typescript line-numbers-mode"><pre class="language-typescript"><code><span class="token keyword">import</span> <span class="token punctuation">{</span> isPlainObject <span class="token punctuation">}</span> <span class="token keyword">from</span> <span class="token string">'./util'</span>
    45. 

  45. 

  46. <span class="token keyword">function</span> <span class="token function">normalizeHeaderName</span> <span class="token punctuation">(</span>headers<span class="token operator">:</span> <span class="token builtin">any</span><span class="token punctuation">,</span> normalizedName<span class="token operator">:</span> <span class="token builtin">string</span><span class="token punctuation">)</span><span class="token operator">:</span> <span class="token keyword">void</span> <span class="token punctuation">{</span>
    47. 

  47.   <span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token operator">!</span>headers<span class="token punctuation">)</span> <span class="token punctuation">{</span>
    48. 

  48.     <span class="token keyword">return</span>
    49. 

  49.   <span class="token punctuation">}</span>
    50. 

  50.   Object<span class="token punctuation">.</span><span class="token function">keys</span><span class="token punctuation">(</span>headers<span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">forEach</span><span class="token punctuation">(</span>name <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
    51. 

  51.     <span class="token keyword">if</span> <span class="token punctuation">(</span>name <span class="token operator">!==</span> normalizedName <span class="token operator">&amp;&amp;</span> name<span class="token punctuation">.</span><span class="token function">toUpperCase</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">===</span> normalizedName<span class="token punctuation">.</span><span class="token function">toUpperCase</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
    52. 

  52.       headers<span class="token punctuation">[</span>normalizedName<span class="token punctuation">]</span> <span class="token operator">=</span> headers<span class="token punctuation">[</span>name<span class="token punctuation">]</span>
    53. 

  53.       <span class="token keyword">delete</span> headers<span class="token punctuation">[</span>name<span class="token punctuation">]</span>
    54. 

  54.     <span class="token punctuation">}</span>
    55. 

  55.   <span class="token punctuation">}</span><span class="token punctuation">)</span>
    56. 

  56. <span class="token punctuation">}</span>
    57. 

  57. 

  58. <span class="token keyword">export</span> <span class="token keyword">function</span> <span class="token function">processHeaders</span> <span class="token punctuation">(</span>headers<span class="token operator">:</span> <span class="token builtin">any</span><span class="token punctuation">,</span> data<span class="token operator">:</span> <span class="token builtin">any</span><span class="token punctuation">)</span><span class="token operator">:</span> <span class="token builtin">any</span> <span class="token punctuation">{</span>
    59. 

  59.   <span class="token function">normalizeHeaderName</span><span class="token punctuation">(</span>headers<span class="token punctuation">,</span> <span class="token string">'Content-Type'</span><span class="token punctuation">)</span>
    60. 

  60. 

  61.   <span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token function">isPlainObject</span><span class="token punctuation">(</span>data<span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
    62. 

  62.     <span class="token keyword">if</span> <span class="token punctuation">(</span>headers <span class="token operator">&amp;&amp;</span> <span class="token operator">!</span>headers<span class="token punctuation">[</span><span class="token string">'Content-Type'</span><span class="token punctuation">]</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
    63. 

  63.       headers<span class="token punctuation">[</span><span class="token string">'Content-Type'</span><span class="token punctuation">]</span> <span class="token operator">=</span> <span class="token string">'application/json;charset=utf-8'</span>
    64. 

  64.     <span class="token punctuation">}</span>
    65. 

  65.   <span class="token punctuation">}</span>
    66. 

  66.   <span class="token keyword">return</span> headers
    67. 

  67. <span class="token punctuation">}</span>
    68. 

  68. </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br><span class="line-number">12</span><br><span class="line-number">13</span><br><span class="line-number">14</span><br><span class="line-number">15</span><br><span class="line-number">16</span><br><span class="line-number">17</span><br><span class="line-number">18</span><br><span class="line-number">19</span><br><span class="line-number">20</span><br><span class="line-number">21</span><br><span class="line-number">22</span><br><span class="line-number">23</span><br><span class="line-number">24</span><br></div></div><p>这里有个需要注意的点，因为请求 <code>header</code> 属性是大小写不敏感的，比如我们之前的例子传入 <code>header</code> 的属性名 <code>content-type</code> 就是全小写的，所以我们先要把一些 <code>header</code> 属性名规范化。</p> <h2 id="实现请求-header-处理逻辑"><a href="#实现请求-header-处理逻辑" class="header-anchor">#</a> 实现请求 header 处理逻辑</h2> <p>在这之前，我们先修改一下 <code>AxiosRequestConfig</code> 接口类型的定义，添加 <code>headers</code> 这个可选属性：</p> <p><code>types/index.ts</code></p> <div class="language-typescript line-numbers-mode"><pre class="language-typescript"><code><span class="token keyword">export</span> <span class="token keyword">interface</span> <span class="token class-name">AxiosRequestConfig</span> <span class="token punctuation">{</span>
    69. 

  69.   url<span class="token operator">:</span> <span class="token builtin">string</span>
    70. 

  70.   method<span class="token operator">?</span><span class="token operator">:</span> Method
    71. 

  71.   data<span class="token operator">?</span><span class="token operator">:</span> <span class="token builtin">any</span>
    72. 

  72.   params<span class="token operator">?</span><span class="token operator">:</span> <span class="token builtin">any</span>
    73. 

  73.   headers<span class="token operator">?</span><span class="token operator">:</span> <span class="token builtin">any</span>
    74. 

  74. <span class="token punctuation">}</span>
    75. 

  75. </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br></div></div><p><code>index.ts</code>：</p> <div class="language-typescript line-numbers-mode"><pre class="language-typescript"><code><span class="token keyword">function</span> <span class="token function">processConfig</span> <span class="token punctuation">(</span>config<span class="token operator">:</span> AxiosRequestConfig<span class="token punctuation">)</span><span class="token operator">:</span> <span class="token keyword">void</span> <span class="token punctuation">{</span>
    76. 

  76.   config<span class="token punctuation">.</span>url <span class="token operator">=</span> <span class="token function">transformURL</span><span class="token punctuation">(</span>config<span class="token punctuation">)</span>
    77. 

  77.   config<span class="token punctuation">.</span>headers <span class="token operator">=</span> <span class="token function">transformHeaders</span><span class="token punctuation">(</span>config<span class="token punctuation">)</span>
    78. 

  78.   config<span class="token punctuation">.</span>data <span class="token operator">=</span> <span class="token function">transformRequestData</span><span class="token punctuation">(</span>config<span class="token punctuation">)</span>
    79. 

  79. <span class="token punctuation">}</span>
    80. 

  80. 

  81. <span class="token keyword">function</span> <span class="token function">transformHeaders</span> <span class="token punctuation">(</span>config<span class="token operator">:</span> AxiosRequestConfig<span class="token punctuation">)</span> <span class="token punctuation">{</span>
    82. 

  82.   <span class="token keyword">const</span> <span class="token punctuation">{</span> headers <span class="token operator">=</span> <span class="token punctuation">{</span><span class="token punctuation">}</span><span class="token punctuation">,</span> data <span class="token punctuation">}</span> <span class="token operator">=</span> config
    83. 

  83.   <span class="token keyword">return</span> <span class="token function">processHeaders</span><span class="token punctuation">(</span>headers<span class="token punctuation">,</span> data<span class="token punctuation">)</span>
    84. 

  84. <span class="token punctuation">}</span>
    85. 

  85. </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br></div></div><p>因为我们处理 <code>header</code> 的时候依赖了 <code>data</code>，所以要在处理请求 <code>body</code> 数据之前处理请求 <code>header</code>。</p> <p><code>xhr.ts</code>：</p> <div class="language-typescript line-numbers-mode"><pre class="language-typescript"><code><span class="token keyword">export</span> <span class="token keyword">default</span> <span class="token keyword">function</span> <span class="token function">xhr</span> <span class="token punctuation">(</span>config<span class="token operator">:</span> AxiosRequestConfig<span class="token punctuation">)</span><span class="token operator">:</span> <span class="token keyword">void</span> <span class="token punctuation">{</span>
    86. 

  86.   <span class="token keyword">const</span> <span class="token punctuation">{</span> data <span class="token operator">=</span> <span class="token keyword">null</span><span class="token punctuation">,</span> url<span class="token punctuation">,</span> method <span class="token operator">=</span> <span class="token string">'get'</span><span class="token punctuation">,</span> headers <span class="token punctuation">}</span> <span class="token operator">=</span> config
    87. 

  87. 

  88.   <span class="token keyword">const</span> request <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">XMLHttpRequest</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
    89. 

  89. 

  90.   request<span class="token punctuation">.</span><span class="token function">open</span><span class="token punctuation">(</span>method<span class="token punctuation">.</span><span class="token function">toUpperCase</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">,</span> url<span class="token punctuation">,</span> <span class="token boolean">true</span><span class="token punctuation">)</span>
    91. 

  91. 

  92.   Object<span class="token punctuation">.</span><span class="token function">keys</span><span class="token punctuation">(</span>headers<span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">forEach</span><span class="token punctuation">(</span><span class="token punctuation">(</span>name<span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
    93. 

  93.     <span class="token keyword">if</span> <span class="token punctuation">(</span>data <span class="token operator">===</span> <span class="token keyword">null</span> <span class="token operator">&amp;&amp;</span> name<span class="token punctuation">.</span><span class="token function">toLowerCase</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">===</span> <span class="token string">'content-type'</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
    94. 

  94.       <span class="token keyword">delete</span> headers<span class="token punctuation">[</span>name<span class="token punctuation">]</span>
    95. 

  95.     <span class="token punctuation">}</span> <span class="token keyword">else</span> <span class="token punctuation">{</span>
    96. 

  96.       request<span class="token punctuation">.</span><span class="token function">setRequestHeader</span><span class="token punctuation">(</span>name<span class="token punctuation">,</span> headers<span class="token punctuation">[</span>name<span class="token punctuation">]</span><span class="token punctuation">)</span>
    97. 

  97.     <span class="token punctuation">}</span>
    98. 

  98.   <span class="token punctuation">}</span><span class="token punctuation">)</span>
    99. 

  99. 

  100.   request<span class="token punctuation">.</span><span class="token function">send</span><span class="token punctuation">(</span>data<span class="token punctuation">)</span>
    101. 

  101. <span class="token punctuation">}</span>
    102. 

  102. </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br><span class="line-number">12</span><br><span class="line-number">13</span><br><span class="line-number">14</span><br><span class="line-number">15</span><br><span class="line-number">16</span><br><span class="line-number">17</span><br></div></div><p>这里要额外判断一个逻辑，当我们传入的 <code>data</code> 为空的时候，请求 <code>header</code> 配置 <code>Content-Type</code> 是没有意义的，于是我们把它删除。</p> <h2 id="demo-编写"><a href="#demo-编写" class="header-anchor">#</a> demo 编写</h2> <div class="language-typescript line-numbers-mode"><pre class="language-typescript"><code><span class="token function">axios</span><span class="token punctuation">(</span><span class="token punctuation">{</span>
    103. 

  103.   method<span class="token operator">:</span> <span class="token string">'post'</span><span class="token punctuation">,</span>
    104. 

  104.   url<span class="token operator">:</span> <span class="token string">'/base/post'</span><span class="token punctuation">,</span>
    105. 

  105.   data<span class="token operator">:</span> <span class="token punctuation">{</span>
    106. 

  106.     a<span class="token operator">:</span> <span class="token number">1</span><span class="token punctuation">,</span>
    107. 

  107.     b<span class="token operator">:</span> <span class="token number">2</span>
    108. 

  108.   <span class="token punctuation">}</span>
    109. 

  109. <span class="token punctuation">}</span><span class="token punctuation">)</span>
    110. 

  110. 

  111. <span class="token function">axios</span><span class="token punctuation">(</span><span class="token punctuation">{</span>
    112. 

  112.   method<span class="token operator">:</span> <span class="token string">'post'</span><span class="token punctuation">,</span>
    113. 

  113.   url<span class="token operator">:</span> <span class="token string">'/base/post'</span><span class="token punctuation">,</span>
    114. 

  114.   headers<span class="token operator">:</span> <span class="token punctuation">{</span>
    115. 

  115.     <span class="token string-property property">'content-type'</span><span class="token operator">:</span> <span class="token string">'application/json;'</span>
    116. 

  116.   <span class="token punctuation">}</span><span class="token punctuation">,</span>
    117. 

  117.   data<span class="token operator">:</span> <span class="token punctuation">{</span>
    118. 

  118.     a<span class="token operator">:</span> <span class="token number">1</span><span class="token punctuation">,</span>
    119. 

  119.     b<span class="token operator">:</span> <span class="token number">2</span>
    120. 

  120.   <span class="token punctuation">}</span>
    121. 

  121. <span class="token punctuation">}</span><span class="token punctuation">)</span>
    122. 

  122. 

  123. <span class="token keyword">const</span> paramsString <span class="token operator">=</span> <span class="token string">'q=URLUtils.searchParams&amp;topic=api'</span>
    124. 

  124. <span class="token keyword">const</span> searchParams <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">URLSearchParams</span><span class="token punctuation">(</span>paramsString<span class="token punctuation">)</span>
    125. 

  125. 

  126. <span class="token function">axios</span><span class="token punctuation">(</span><span class="token punctuation">{</span>
    127. 

  127.   method<span class="token operator">:</span> <span class="token string">'post'</span><span class="token punctuation">,</span>
    128. 

  128.   url<span class="token operator">:</span> <span class="token string">'/base/post'</span><span class="token punctuation">,</span>
    129. 

  129.   data<span class="token operator">:</span> searchParams
    130. 

  130. <span class="token punctuation">}</span><span class="token punctuation">)</span>
    131. 

  131. </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br><span class="line-number">12</span><br><span class="line-number">13</span><br><span class="line-number">14</span><br><span class="line-number">15</span><br><span class="line-number">16</span><br><span class="line-number">17</span><br><span class="line-number">18</span><br><span class="line-number">19</span><br><span class="line-number">20</span><br><span class="line-number">21</span><br><span class="line-number">22</span><br><span class="line-number">23</span><br><span class="line-number">24</span><br><span class="line-number">25</span><br><span class="line-number">26</span><br><span class="line-number">27</span><br><span class="line-number">28</span><br><span class="line-number">29</span><br></div></div><p>通过 demo 我们可以看到，当我们请求的数据是普通对象并且没有配置 <code>headers</code> 的时候，会自动为其添加 <code>Content-Type:application/json;charset=utf-8</code>；同时我们发现当 data 是某些类型如 <code>URLSearchParams</code> 的时候，浏览器会自动为请求 <code>header</code>加上合适的 <code>Content-Type</code>。</p> <p>至此我们对于请求的处理逻辑暂时告一段落。目前我们的请求从网络层面是可以收到服务端的响应的，下一节课我们就从代码层面来处理服务端响应，并且让调用方可以拿到从服务端返回的数据。</p></div></div>  <div class="page-edit"><div class="edit-link"><a href="https://github.com/heBody/blog/edit/master/docs/《TypeScript 从零实现 axios》/04.ts-axios 基础功能实现/03.处理请求 header.md" target="_blank" rel="noopener noreferrer">编辑</a> <span><svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15" class="icon outbound"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path> <polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg> <span class="sr-only">(opens new window)</span></span></div> <div class="tags"><a href="/blog/tags/?tag=TypeScript" title="标签">#TypeScript</a></div> <div class="last-updated"><span class="prefix">上次更新:</span> <span class="time">2022/12/14, 19:36:42</span></div></div> <div class="page-nav-wapper"><div class="page-nav-centre-wrap"><a href="/blog/pages/887cd0918e2543d8/" class="page-nav-centre page-nav-centre-prev"><div class="tooltip">处理请求 body 数据</div></a> <a href="/blog/pages/a57debe141e1e4f4/" class="page-nav-centre page-nav-centre-next"><div class="tooltip">获取响应数据</div></a></div> <div class="page-nav"><p class="inner"><span class="prev">
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