SIP
Simuler une réponse 404 Not Found
The user specified in the Request-URI does not exist at the domain. The server has authoritative information that the user does not exist.
Voir la référence complète →1 Réponse HTTP
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 Tester avec curl
curl -i https://httpbin.org/status/404
3 Retourner 404 Not Found dans votre framework
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
)
);