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AP Computer Science Principles

Unit 1
Unit 1: Data
Introduction to DataData RepresentationData TypesData Structures
Unit 2 • Chapter 3

HTTP

Video Summary

Hypertext Transfer Protocol (HTTP) is the foundation of the World Wide Web. It is a request-response protocol that defines how information is transmitted between a web browser and a web server. HTTP is a stateless protocol, which means that each request is independent of any previous requests. This makes it easy to scale web servers to handle large numbers of simultaneous connections. The first part of an HTTP request is the method, which specifies the action that the client wants to perform. The most common methods are GET, POST, PUT, and DELETE. The second part of the request is the path, which specifies the resource that the client wants to access. The third part of the request is the headers, which contain additional information about the request, such as the client's browser and operating system. The last part of the request is the body, which contains the data that the client wants to send to the server. The response from the server consists of a status code, which indicates whether the request was successful, and a body, which contains the requested data. The most common status codes are 200 OK, 404 Not Found, and 500 Internal Server Error. HTTP is a simple but powerful protocol that has made the World Wide Web possible.

Knowledge Check

What does HTTP stand for?

What is the difference between HTTP and HTTPS?

What is the purpose of the HTTP request method?