Twilio arrived much later, but the API patterns it popularized—parameterized requests, server-side endpoints, and callback-driven workflows—were prototyped on the early web via CGI scripts, HTML forms, and browser scripting between 1995 and 1998.
In 1995–1998, the web didn’t have Web Workers—but it definitely had the problem they solve. This chapter traces how early JavaScript, CGI, and form-driven interactivity revealed the need for background processing in browsers.
JSON wasn’t on the scene yet, but the web’s need for lightweight data exchange was already shaping API behavior. From HTML forms and CGI to JavaScript, cookies, and early dynamic pages (1995–1998), this chapter traces the pre-JSON techniques that taught the web how to talk in compact name/value pairs.
From 1995 to 1998, CGI scripts and HTML forms acted like early web APIs—defining a practical contract between browsers and servers through query strings, POST bodies, headers, and plain-text responses.
Between 1990 and 1994, CGI scripts turned the early Web from static documents into interactive services. This chapter explains how the first practical HTTP interfaces worked—requests as inputs, script output as responses—and how that pattern became the backbone of modern web APIs.