web application reconnaissance(an explorative data-gathering phase that generally occurs prior to hacking a web application. Web application reconnaissance is typically performed by hackers, pen testers, or bug bounty hunters, but can also be an effective way for security engineers to find weakly secured mechanisms in a web application and patch them before a malicious actor find them rhinosecuritylabs.com, pentest-tools.com, oreilly.comAlex_Odeychuk)
