Give me feedback of my Request Header Parser Microservice project

Give me feedback of my Request Header Parser Microservice project
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#1

I just finished the second API project of the Back End Certificate.
This project let me learn about HTTP Headers Fields.

Please, give me feedback:
Repository: https://github.com/gustavoaca1997/requestHeaderParser
App: https://request-header-parser-microservice-by-gustavo.glitch.me/whoami