@capacitadev: HTTP Status Codes — What Is the Server Really Telling You? Every time your app talks to a server, it gets back a 3-digit number. Most developers see them in browser error screens and move on. But in interviews, knowing how to use them correctly separates junior devs from developers who think like engineers. Here is the short version: 2xx means success. 200 OK returns data. 201 Created confirms something new was made. 204 No Content is success with nothing to return — common after a delete operation. 3xx means redirection. The resource moved. 301 is permanent, 302 is temporary. The client is expected to follow the new URL automatically. 4xx means the client made a mistake. 400 is bad data. 401 means you are not authenticated. 403 means you are authenticated but not allowed. 404 means the resource does not exist. 422 means the data was received but failed validation. 5xx means the server failed. 500 is a generic crash. 503 means the server is unavailable. 504 is a timeout from an upstream dependency. The classic interview trap: What is the difference between 401 and 403? 401 means "I do not know who you are." 403 means "I know exactly who you are, and you cannot do this." Another common question: Should you return 403 or 404 when a user tries to access a resource they do not own? 403 is more accurate. 404 is used when you want to hide the existence of the resource for security reasons. In ASP.NET Core, you return these using built-in helpers: Ok(), NotFound(), BadRequest(), CreatedAtAction(), and Forbid(). Using the wrong code is a subtle but real bug. Follow @capacitadev on Instagram and TikTok for more content like this. There is a free PDF guide in the link of the profile — grab it. #softwaredeveloper #juniordev #webdevelopment #api #http

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Monday 15 June 2026 19:52:56 GMT