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加入说明性文档，添加MDN链接，加入一些tips，去除测试语句
atian25
requested changes
Jan 21, 2020
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| 对应的测试： | ||
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| ```js |
| 除了 `状态码` 和 `响应体` 外，还可以通过响应 `Header` 设置一些扩展信息。 | ||
| 设置应答包的 `HTTP Header` | ||
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| 关于`HTTP Header`本身，可以查看[MDN的HTTP headers文档](https://developer.mozilla.org/zh-CN/docs/Web/HTTP/Headers)\ |
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中文英文排版要有空格，参考下 https://github.com/sparanoid/chinese-copywriting-guidelines
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| ### `ctx.set(name, value)` | ||
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| 除了 `状态码` 和 `响应体` 外，还可以通过响应 `Header` 设置一些扩展信息。 |
| 关于`HTTP Header`本身，可以查看[MDN的HTTP headers文档](https://developer.mozilla.org/zh-CN/docs/Web/HTTP/Headers)\ | ||
| 每个`HTTP Header`通常说明应答的资源本体（HTTP body）的属性，或者控制浏览器对该资源的一些行为（如缓存等） | ||
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| > egg本身会自动添加必要的`header`（比如返回json时自动设置 `content-type`为 `application/json; charset=utf-8`，说明该资源为json类型和utf-8字符编码），另外public路径下的文件也会自动加入缓存时间（参考[egg-static](https://github.com/eggjs/egg-static)） |
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| > egg本身会自动添加必要的`header`（比如返回json时自动设置 `content-type`为 `application/json; charset=utf-8`，说明该资源为json类型和utf-8字符编码），另外public路径下的文件也会自动加入缓存时间（参考[egg-static](https://github.com/eggjs/egg-static)） | ||
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| 如果需要便捷设置资源类型的header（`content-type`），可以查看下面的 `ctx.type` 文档 |
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| - `ctx.set(key, value)`：可以设置一个 `Header`。 | ||
| - `ctx.set(headers)`：可以同时设置多个 `Header`。 | ||
| - `ctx.set(headers)`：可以同时设置多个 `Header`，多个header使用对象的方式组合，如`{'key1':'value1', 'key2':'value2'}` |
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加入说明性文档，添加MDN链接，加入一些tips，去除测试语句