? HTTP 204 — No Content

? Quick Overview

The 204 No Content status code indicates that the server successfully processed the request, but there is no content to send back in the response body.

? Key Concepts

• Request was successful
• No response body is returned
• Client should not change the current page
• Often used for background or silent updates

? Syntax / Theory

A 204 response must not include a message body and should not include Content-Length or Content-Type headers.

? Code Example

// Express.js route returning 204 No Content
app.delete("/api/user/:id", (req, res) => {
  res.status(204).send(); 
  // .send() ends the response without sending data
});

? Live Output / Explanation

? Interactive Example

// Fetch API handling a 204 response
fetch("/api/files/123", { method: "DELETE" })
  .then(response => {
    if (response.status === 204) {
      console.log("Deleted successfully");
      // Remove item from UI instantly
      document.getElementById("file-row").remove();
    }
  });

? Use Cases

• DELETE requests
• Logout actions
• Form submissions without UI change
• Background preference updates