response.writeHead（）方法中的{'Content-Type：'：'text / plain'}的数据类型是什么？

Question

The common way to creating web server in node.js is something like this: response.writeHead(200,{'Content-Type':'text/plain'}); ,but what is data type of {'Content-Type:':'text/plain'} section? an Object ? or a tuple ? I have never seen anything like that before in Javascript.

Answer 1

It is an anonymous object. Have you seen something simple like this:

{x: 10}

Well it is the same thing except it has a '-' in the key name so the key has to be put in quotes. The object is using specific naming that corresponds with the standards for HTTP headers ( ref ).

Answer 2

Text/plain is full text like .txt file.

In text/plain content, the HTML doesn't be parsed. If you write " <b>Hi</b> ", you will see the same thing (" <b>Hi</b> ").