While working on PR #237 to solve #217 , I used this symbol "©" inside my html input file but one test failed because of this character then I started thinking about a way to solve that issue.

We should find a way to add encoding utf8 to the InputStream at the core level not when doing tests. Now, we add encoding when doing tests, we should correct that.

https://stackoverflow.com/questions/5928046/spring-mvc-utf-8-encoding

https://stackoverflow.com/questions/5649329/utf-8-encoding-problem-in-spring-mvc

https://stackoverflow.com/questions/29434896/how-to-deal-with-java-encoding-problems-especially-xml

https://www.baeldung.com/java-char-encoding

DOES "multipart/form-data handle utf8 encoding ?

https://www.google.com/search?q=DOES+%22multipart%2Fform-data+handle+utf8+encoding+%3F&rlz=1C1FCXM_pt-PTPT1032PT1032&oq=DOES+%22multipart%2Fform-data+handle+utf8+encoding+%3F&aqs=chrome..69i57j33i22i29i30.19637j1j7&sourceid=chrome&ie=UTF-8

https://issues.redhat.com/browse/RESTEASY-390

https://stackoverflow.com/questions/546365/utf-8-text-is-garbled-when-form-is-posted-as-multipart-form-data

java define encoding of InputStream

https://www.google.com/search?q=java+define+encoding+of+InputStream&rlz=1C1FCXM_pt-PTPT1032PT1032&oq=java+define+encoding+of+InputStream&aqs=chrome..69i57j33i160l2j33i22i29i30l4.19441j1j7&sourceid=chrome&ie=UTF-8

https://stackoverflow.com/questions/3043710/java-inputstream-encoding-charset