FTP
421 Service Not Available 응답 모의 테스트
Service not available, closing control connection. The server is shutting down or has reached its connection limit and cannot serve this request.
전체 레퍼런스 보기 →1 HTTP 응답
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 curl로 테스트하기
curl -i https://httpbin.org/status/421
3 프레임워크에서 421 Service Not Available 반환하기
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
)
);