From HTTP’s earliest request/response patterns to the first practical server interfaces, 1990–1994 quietly planted the design instincts behind today’s composable web APIs—uniform URLs, simple verbs, and the idea that you can stitch capabilities together through links and messages.
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 URLs and early HTTP methods to CGI and the first dynamic web interactions, the 1990–1994 era laid the interface patterns that later powered Twitter API integrations and modern social platform APIs.
Between 1990 and 1994, the Web’s earliest HTTP interactions weren’t called “APIs,” yet they introduced resource identity, uniform operations, and stateless requests—the same building blocks REST would later formalize.