If you wonder what means a 418 HTTP status code or which RFC defines the txn JWT claim, Web concepts is what you’re looking for. I just stopped doing HTTP/web/RFC related search, I now always check Erik Wilde’s web concepts first and usually find what I’m looking for instantly. Icing on the cake, all data is also available in JSON format. The Web’s Uniform Interface is based on a large and growing set of specifications. These specifications establish the shared concepts that providers and consumers of Web services can rely on. Web Concepts is providing an overview of these concepts and of the specifications defining them.