Any developer that needs to use the HTTP(S) transport protocol should know the basics of HTTP Status Codes. I think all Java developers know the 500 status code (server error), but if you ever do development in an enterprise context or if you do app-to-app development, you’ll sooner than later be forced to look for 200s and 300s to debug your application’s communication with its clients.
Here’s a quick overview of HTTP Status Codes:
100-199: Informational
200-299: Success
300-399: Redirection
400-499: Client Error
500-599: Server Error
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