https://mohemiv.com/all/exploiting-xxe-with-local-dtd-files/
https://fr.gosecure.net/blog/2019/07/16/automating-local-dtd-discovery-for-xxe-exploitation/
https://github.com/GoSecure/dtd-finder
https://www.noob.ninja/2019/12/spilling-local-files-via-xxe-when-http.html
https://2018.zeronights.ru/wp-content/uploads/materials/20-Reverse-proxies-Inconsistency.pdf
https://www.elttam.com/blog/ruby-deserialization/
https://github.com/c0ny1/xxe-lab/blob/master/java_xxe/src/me/gv7/xxe/LoginServlet.java
https://blog.harshjaiswal.com/vimeo-ssrf-with-code-execution-potential/