FTP
Simuler une réponse 421 Service Not Available
Service not available, closing control connection. The server is shutting down or has reached its connection limit and cannot serve this request.
Voir la référence complète →1 Réponse HTTP
HTTP/1.1 421 Service Not Available
Content-Type: application/json
Date: Tue, 25 Feb 2026 12:00:00 GMT
Content-Length: 70
{
"error": "service_not_available",
"message": "Service Not Available"
}
2 Tester avec curl
curl -i https://httpbin.org/status/421
3 Retourner 421 Service Not Available dans votre framework
django
from django.http import JsonResponse
def my_view(request):
return JsonResponse(
{"error": "service_not_available", "message": "Service Not Available"},
status=421,
)
flask
from flask import Flask, jsonify
app = Flask(__name__)
@app.route("/endpoint")
def my_endpoint():
return jsonify({"error": "service_not_available", "message": "Service Not Available"}), 421
fastapi
from fastapi import FastAPI
from fastapi.responses import JSONResponse
app = FastAPI()
@app.get("/endpoint")
def my_endpoint():
return JSONResponse(
content={"error": "service_not_available", "message": "Service Not Available"},
status_code=421,
)
express.js
// Express.js
app.get('/endpoint', (req, res) => {
res.status(421).json({"error": "service_not_available", "message": "Service Not Available"});
});
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(421)
.body(Map.of("error", "service_not_available",
"message", "Service Not Available"));
}
}
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(421)
json.NewEncoder(w).Encode(map[string]string{
"error": "service_not_available",
"message": "Service Not Available",
})
}
ruby on rails
class MyController < ApplicationController
def my_action
render json: {"error": "service_not_available", "message": "Service Not Available"},
status: :service_not_available
end
end
asp.net core
// ASP.NET Core Minimal API
app.MapGet("/endpoint", () =>
Results.Json(
new { error = "service_not_available", message = "Service Not Available" },
statusCode: 421
)
);