What is HTTP?
The Hypertext Transfer Protocol (HTTP) is the main network communication protocol on the web and allows HTTP clients and servers to communicate with each other. The HTTP protocol is based on a request-response architecture between a client and a server. Client applications send requests to the server, and servers process the requests and respond to clients. Each HTTP messages contain a request string, HTTP headers, and a message body.
What is CORS?
Cross-Origin Resource Sharing (CORS) is an HTTP header-based mechanism that enables secure communication between browsers and servers running from different sources. These sources can differ from the current ones by hostname, HTTP scheme, or port number. A feature of CORS implementation was related to the restrictions of the single-origin policy, which restricts resources to interact only with resources located in the same domain. CORS is a way that a server can check if a request is coming from an allowed source and tell the browser not to block it.
CORS Header Syntax
The following is the general syntax for CORS request header:
What is HTTP Authentication?
HTTP Authentication is the process of determining whether a client is authorized to access a resource. The HTTP protocol supports authentication from the box to restrict access to protected resources.
What are Credentials?
Credentials are cookies, authorization headers, and TLS client certificates, which a client acquires from a service or user and stores for future authentication purposes. Credentials used in authentication are digital documents that associate a user's identity with some form of proof of identity, such as a certificate or password.