https://github.com/wliang6/ChatEngine/blob/fded8e710ad59f816867ad47d7fc4862f6502f3e/src/chatbotapp/LoginServlet.java#L55:L64
https://payatu.com/advisory/cross-site-scripting-xss-vulnerability-in-loginservlet-java-wliang6-chatengine-allows-attackers-to-execute-arbitrary-code/
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