本文详细解释了HTTP中的Accept和Content-Type头部的区别与作用。Accept头部用于客户端告知服务器其可接受的内容类型，而Content-Type则用于说明请求中携带的数据类型，这对POST和PUT请求尤其重要。
As you correctly note, the Accept header is used by HTTP clients to tell the server what content types they'll accept. The server will then send back a response, which will include a Content-Type header telling the client what the content type of the returned content actually is.
However, as you may have noticed, HTTP requests can also contain Content-Type headers. Why? Well, think about POST or PUT requests. With those request types, the client is actually sending a bunch of data to the server as part of the request, and the Content-Type header tells the server what the data actually is (and thus determines how the server will parse it).
In particular, for a typical POST request resulting from an HTML form submission, the Content-Type of the request will normally be either application/x-www-form-urlencoded or multipart/form-data.
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