Between 1990 and 1994, the Web’s earliest HTTP interfaces pushed a surprising innovation: documentation that behaved like a product. In Chapter 69, see how URLs, hypertext manuals, and early developer expectations set patterns that web APIs still follow.
Swagger and OpenAPI feel modern, but their core ideas—contracts, endpoints, headers, and examples—trace back to the Web’s earliest HTTP interfaces. This chapter looks at 1990–1994 documentation practices that quietly set the pattern for today’s API tooling.
OpenAPI didn’t exist in the early 1990s, but the Web’s first standards—URLs, HTTP, MIME types, and simple server-side interfaces—introduced the core idea that an API can be described consistently. This chapter traces the roots of standardized API descriptions from 1990 to 1994.
From HTTP’s minimalist beginnings to early dynamic web gateways, 1990–1994 laid the practical foundations for later enterprise API discovery—ultimately motivating WSDL-style service descriptions even though WSDL itself arrived years later.