An explanation of the HTTP protocol

"An explanation of the HTTP protocol"

? Request Section

* Request Line

* Submission Method:

* There are many ways to submit, commonly used get and post:

* The difference between get and post:

* Get the submitted parameters are displayed on the address bar, and post is not displayed.

* Get is often limited by size, while post has no size limit.

* Get has no request body, while Post has request body.

* Submission Path:

* Protocol version:

* Request Header

* are displayed in the form of key-value pairs. Typically a key corresponds to a value, and there is an individual key that corresponds to more than one value.

* User-agent: Represents the type of browser. ---file download: Download the Chinese file: IE uses Urlencodor to encode, while Fddddddddddddddddirefox uses BASE64 encoding.

* Referer: Represents the source of the Web page. ---anti-theft chain.

* If-modified-since: Typically used with header last-modified in the response to find the local cache.

* Request Body

* is the submit parameter of the Post submission method.

? Response Section

* Response Line:

* Protocol version

* Status Code:

* 200: Success

* 302: Redirect

* 304: Find local cache

* 404: Resource does not exist

* 500: Server Internal Error

* Status Code description

* Response Header: Key value pairs, usually a key corresponding to a value, there is a key corresponding to more than one value.

* Last-modified: Use with if-modified-since in the request to find the local cache.

* Content-disposition: The use of a header information for file download.

* Location: Redirect The path of the jump.

* Refresh: Timed update/timed jump.

* Response Body: Displays the contents of the browser's page.

An explanation of the HTTP protocol