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This article mainly explains the "what is the role of Content Type attributes", the content of the explanation is simple and clear, easy to learn and understand, the following please follow the editor's ideas slowly in depth, together to study and learn "what is the role of Content Type attributes" bar!

The server usually knows how the message body in the request is encoded according to the Content-Type field in the request header (headers), and then parses the body. So when it comes to the data submission scheme of POST, it includes two parts: Content-Type and message body coding.

The value type of Content-Type:

Application/json: the message body is a serialized jsON string

Application/x-www-form-urlencoded: data is encoded as name / value pairs. This is the standard coding format.

Multipart/form-data: you need to use this format when you need to upload files in the form. Common media formats are used when uploading files

Text/plain: data is encoded in plain text (text/json/xml/html) and does not contain any controls or format characters

Content-Type action

The difference between application/json and application/x-www-form-urlencoded

Application/json:

Function: tell the server that the subject content of the request is a string in json format, and the server will parse the json string

Benefits: front-end staff do not need to care about the complexity of the data structure, as long as the standard json format can be successfully submitted.

Application/x-www-form-urlencoded: is the default Ajax request method for Jquery

Function: the data will be serialized in the form of key-value pairs during the request. Send it to the server in key1=value1&key2=value2 mode

Benefit: all browsers support

Application/x-www-form-urlencoded: information data is encoded as name / value pairs, which is the standard and default encoding format

When action is get, the client converts the form data into a string append to url, using'?' Split.

When action is post, the browser encapsulates the form data into httpbody and sends it to server. (you can cancel the pre-check request for the post request)

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