Chapter 2. It Starts with a URL

The most recognizable hallmark of the Web is a simple text string known as the Uniform Resource Locator (URL). Each well-formed, fully qualified URL is meant to conclusively address and uniquely identify a single resource on a remote server (and in doing so, implement a couple of related, auxiliary functions). The URL syntax is the cornerstone of the address bar, the most important user interface (UI) security indicator in every browser.

In addition to true URLs used for content retrieval, several classes of pseudo-URLs use a similar syntax to provide convenient access to browser-level features, including the integrated scripting engine, several special document-rendering modes, and so on. Perhaps unsurprisingly, ...

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