为请求设置内容类型的标准方法

Question

There are two approaches that you can set content-type for a request.

1: Server Side

header('Content-Type: application/json');

2: Client Side

fetch('https://example/api', {
          headers:{                   
            'Content-Type': 'application/json',
          },

I want to know, is setting the content-type the duty of which developer? Backend or frontend? Or both of them? What's the standard way?

Answer 1

Both are correct and needed when working with two-sided communication. It's just some browsers/programs default their content type, so this is usually not required to implement because client programs send this already.

Sometimes applications only offer read-only resource so providing content-type is not necessary for the client, but is replied from the server side.

Providing the content type is also only required if the resource supports more than 1 content type, which is most often NOT the case.

So the answer, as it is often in software world is: "it depends" :)