Long before OpenAPI, developers relied on HTML forms, query strings, and CGI scripts as practical “APIs.” From 1995–1998, browser scripting and early dynamic web integration created implicit contracts that later demanded standardized API descriptions.
From CGI scripts to browser scripting and form-driven endpoints, 1995–1998 shaped early developer access control patterns that foreshadowed modern API keys—often implemented with shared secrets, IP allowlists, and basic auth.
Long before today’s cloud provider APIs, early HTTP servers, HTML forms, and CGI scripts (1990–1994) taught developers a powerful idea: infrastructure can be controlled through simple, stateless web interfaces.