HTTP API authentication has evolved through many forms over the years. As so-called RESTful APIs gained popularity, a variety of methods sprung up: key passing, plain-old HTTP Basic Auth, OAuth 1.0, OAuth 1.0a, OAuth 2.0 (and it’s 40 revision) and some less-common custom schemes. With the OAuth 2.0 specification finalized, things are finally starting to settle down and coalesce around a single auth mechanism. For publicly-available APIs, OAuth 2.0 should be on your list of requirements.
Authentication: Don’t be Clever
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