SMTP

محاكاة استجابة 421 Service Not Available

The SMTP service is not available and the server is closing the transmission channel. This may be sent as a greeting or during a session if the server needs to shut down.

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1 استجابة HTTP

استجابة 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 اختبار باستخدام curl

terminal

curl -i https://httpbin.org/status/421

3 إرجاع 421 Service Not Available في إطار العمل الخاص بك

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
    )
);

1 استجابة HTTP

2 اختبار باستخدام curl

3 إرجاع 421 Service Not Available في إطار العمل الخاص بك

المزيد من صفحات محاكاة SMTP