A secret note to Bug hunters about URL structure and its parsers.

I wrote this article because there is no proper resource about the URL structure on the internet.

Introduction-Uniform Resource Locator (URL)

We all are familiar with the internet, so we are also familiar with URLs. We can easily recognize a string whether it is URL or not by seeing the ‘Protocol Scheme’ followed by “://” and then sequence of characters separated by “dot”.

#examples
https://example.com/resource/test.img
https://abcd.example.com/resource/index.html

Q. OK! But how the browser recognizes that the given input string at the address bar is the URL?

A. Actually, the browser first looks for the URI instead of the URL.

oh Wait!…. What is the URI?

Before we understand about the URL we should know about the Uniform Resource Identifier (URI). It worthy to directly go to the URI syntax instead of going into depth of its characteristics and rules.

RFC3986 URL Structure 1