OAuth 1.0a is revision A of the OAuth protocol. It has been obsoleted by OAuth 2.0. OAuth is a protocol that enables applications to obtain limited access to user accounts on an HTTP service, such as Facebook and GitHub. OAuth is natively supported in Spring Boot. Note that OAuth 2.0 is not backward compatible with OAuth 1.0
OAuth 1.0a is revision A of the OAuth protocol as defined by Internet Engineering Task Force (IETF) in RFC 5849. This mechanism is used by companies such as Amazon, Google, Facebook, Microsoft and Twitter to permit the users to share information about their accounts with third party applications or websites. It has been obsoleted by OAuth 2.0 (RFC 6749)