是否有必要在Node.js中设置Content-Type？ [英] Is it necessary to set a Content-Type in Node.js?

问题描述

刚开始使用Node.js，看到一些示例后，我发现通常在返回某些内容之前先设置 Content-Type 。

Just started playing with Node.js and after seeing a few examples I see that usually the Content-Type is set before returning some content.

通常对于HTML来说像这样：

Usually something like this for HTML:

res.writeHead(200, {'Content-Type': 'text/html'});
res.write(html);
res.end();

图片：

res.writeHead(200, {'Content-Type': 'image/png'});
res.write(img, 'binary');
res.end();

我阅读了。write（）的文档，它表示如果未指定标头，则它将切换到隐式标头模式并刷新隐式标头

I read the docs for .write() and it says if no header is specified "it will switch to implicit header mode and flush the implicit headers"

通过一些测试，我发现我可以这样写一行：

With some testing I found I can just write one line like so:

res.end(html); // or
res.end(img);

这些都可以正常工作。我还使用本地Apache服务器进行了测试，当我查看加载图像时设置的标头时，没有设置 Content-Type 标头。

These both work fine. I also tested with my local Apache server and when I viewed the headers being set when loading an image there was no Content-Type header set there.

是否需要设置它们？如果不这样做，可能会出现什么情况或错误？

Do I need to bother setting them? What situations or bugs might arise if I don't?

推荐答案

内容类型标头在技术上是可选的，但实际上您将其留给浏览器来猜测您要返回的内容类型。通常，如果知道类型（您可能会这样做），则应该始终指定 Content-Type 。

The Content-Type header is technically optional, but then you are leaving it up to the browser to essentially guess what type of content you are returning. Generally you should always specify a Content-Type if you know the type (which you probably do).

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