416 Range Not Satisfiable

HTTP/1.1 416 Range Not Satisfiable
Content-Range: bytes */1234
Content-Type: text/plain

Requested range is out of bounds.

app.get("/video", (req, res) => {
  const fileSize = 1234;
  const range = req.headers.range;
  
  if (range) {
    // Simplified parsing
    const parts = range.replace(/bytes=/, "").split("-");
    const start = parseInt(parts[0], 10);
    
    if (start >= fileSize) {
      res.status(416).header("Content-Range", `bytes */${fileSize}`).send();
      return;
    }
  }
  res.send("Video content...");
});

from fastapi import FastAPI, Header, Response

app = FastAPI()

@app.get("/download")
async def download(range: str = Header(None)):
    file_size = 1000
    if range and range.startswith("bytes="):
        start = int(range.replace("bytes=", "").split("-")[0])
        if start >= file_size:
            headers = {"Content-Range": f"bytes */{file_size}"}
            return Response(status_code=416, headers=headers)
    return {"message": "Success"}

func handler(w http.ResponseWriter, r *http.Request) {
    // Use http.ServeFile which handles byte ranges automatically
    // If the range is invalid, it will return 416 internally
    http.ServeFile(w, r, "video.mp4")
}

// ASP.NET Core PhysicalFileResult handles range requests automatically.
[HttpGet("media")]
public IActionResult GetMedia()
{
    return PhysicalFile("/path/to/media.mp4", "video/mp4", enableRangeProcessing: true);
}

# Requesting bytes 5000-6000 from a file that is smaller than 5000 bytes
curl -r 5000-6000 https://api.example.com/small_file.txt