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June 26, 2021
Ravi Yasas
REST
Introduction
- Stands for Representational State Transfer.
- REST is a web standards-based architecture that uses the HTTP protocol (port 80) for data communication.
- Uses HTTP methods for data communication
- REST server simply provides access to resources and client access and presents the resource.
- REST is stateless, so there is no session.
- REST uses various representations like TXT, JSON, XML...etc to represent resources.
Methods in REST
- POST
- Sends data to the server for creating a new resource, maybe an entity. Often used when uploading a file or submitting a web form.
- GET
- Retrieves data from the server. Should have no other effect.
- PUT
- Similar to POST, but used to replace an existing entity.
- PATCH
- Similar to PUT, but used to update only certain fields within an existing entity.
- DELETE
- Removes data from the server.
- TRACE
- Provides a way to test what the server receives. It simply returns what was sent.
- OPTIONS
- This allows a client to get information about the request methods supported by a service.
- The relevant response header is Allow with supported methods.
- HEAD
- This returns only the response headers.
- CONNECT
- Used by browser when it knows it talks to a proxy and the final URI begins with https://.
- The intent of CONNECT is to allow end-to-end encrypted TLS sessions, so the data is unreadable to a proxy.
