HTTP
Giả lập phản hồi 404 Not Found
The server cannot find the requested resource. The URL may be wrong, the resource may have been deleted, or it may never have existed.
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HTTP/1.1 404 Not Found
Content-Type: application/json
Date: Tue, 25 Feb 2026 12:00:00 GMT
Content-Length: 55
{
"error": "not_found",
"message": "Resource not found"
}
2 Kiểm tra với curl
curl -i https://httpbin.org/status/404
3 Trả về 404 Not Found trong Framework của bạn
django
from django.http import JsonResponse
def my_view(request):
return JsonResponse(
{"error": "not_found", "message": "Resource not found"},
status=404,
)
flask
from flask import Flask, jsonify
app = Flask(__name__)
@app.route("/endpoint")
def my_endpoint():
return jsonify({"error": "not_found", "message": "Resource not found"}), 404
fastapi
from fastapi import FastAPI
from fastapi.responses import JSONResponse
app = FastAPI()
@app.get("/endpoint")
def my_endpoint():
return JSONResponse(
content={"error": "not_found", "message": "Resource not found"},
status_code=404,
)
express.js
// Express.js
app.get('/endpoint', (req, res) => {
res.status(404).json({"error": "not_found", "message": "Resource not found"});
});
spring boot
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.*;
import java.util.Map;
@RestController
public class MyController {
@GetMapping("/endpoint")
public ResponseEntity<Map<String, Object>> myEndpoint() {
return ResponseEntity
.status(404)
.body(Map.of("error", "not_found",
"message", "Not Found"));
}
}
go net/http
package main
import (
"encoding/json"
"net/http"
)
func myHandler(w http.ResponseWriter, r *http.Request) {
w.Header().Set("Content-Type", "application/json")
w.WriteHeader(404)
json.NewEncoder(w).Encode(map[string]string{
"error": "not_found",
"message": "Not Found",
})
}
ruby on rails
class MyController < ApplicationController
def my_action
render json: {"error": "not_found", "message": "Resource not found"},
status: :not_found
end
end
asp.net core
// ASP.NET Core Minimal API
app.MapGet("/endpoint", () =>
Results.Json(
new { error = "not_found", message = "Not Found" },
statusCode: 404
)
);