Questions about HTTP protocols that may be asked in interviews (summary)

This chapter brings you some questions about the HTTP protocol that may be asked during interviews. It has certain reference value. Friends in need can refer to it. I hope it will be helpful to you.

#1. What are the main features of the HTTP protocol class?

Simple and fast: refers to each resource identifier UII, which is fixed, unified resource identifier,
Flexible: the header has a data type, and different tasks can be completed through an http protocol Transmission of data types
No connection: the connection is broken once
Stateless: the client and the server have two identities, and the identity of the two connectors cannot be distinguished

2. What are the components of the message?

Request message:
The request line contains: http method, page address, http protocol, version
Request header: key&value to tell the server what content I want
Blank line
Request body

Response message:
Status line, response header, blank line, response body

3. What are the methods in the HTTP protocol class?

GET---Get resources
POST---Transfer resources
PUT---Update resources
DELETE---Delete resources
HEAD---Get the message header

4. The difference between post and get

##5. What are the HTTP status codes?

1xx: Prompt message-indicates that the request has been received and continues to be processed

2xx: Success - Indicates that the request has been successfully received
3xx: Redirect--further operations must be performed to complete the request
4xx: Client error--the request has a syntax error or the request cannot be implemented
5xx: Server Error - The server failed to implement a legal request
200 OK: Client request successful
206 PARTIAL CONTENT: The client sent a GET request with a range header, and the server completed it. Range means range
301 moved permanently: The requested page has been moved to a new URL (permanent redirect)
302 FOUND: The requested page has been temporarily moved to a new URL (temporary redirect)
304 NO MODIFIED: The client has a buffered document and issued a conditional request. The server tells the client that the original buffered document can continue to be used (cached)

6. What is a persistent link?

The 1.1 version supports persistent links, but not 1.0

7. What is pipelineization

## Pipelining must be through persistent connections, and must be http version 1.1 or above Support

Only get and head requests can be piped, POST has restrictions

The pipeline mechanism should not be started when creating a connection for the first time, because the server does not necessarily support the http1.1 version protocol

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