https://techofide.com/blogs/advanced-sql-injection-attack-sqli-blind-sql-injection-and-prevention/
https://medium.com/@pranshux0x/super-blind-sql-injection-20000-bounty-thousands-of-targets-still-vulnerable-f9b013765448
https://blog.theori.io/security-threats-caused-by-development-side-effects-1c2af4548482
처음 배울 때 제일 헷갈렸던 개념 (2021.01.15.)
URL encoding = %Percent encoding
(c.f) HTML entities=HTML encoding
< >의 기능과 동작 매커니즘