SMTP
252 Cannot Verify User レスポンスのモック
The server cannot verify the user but will accept the message and attempt delivery. This is often returned in response to VRFY when the server intentionally hides user information.
完全なリファレンスを見る →1 HTTP レスポンス
HTTP/1.1 252 Cannot Verify User
Content-Type: application/json
Date: Tue, 25 Feb 2026 12:00:00 GMT
Content-Length: 21
{
"status": "success"
}
2 curl でテストする
curl -i https://httpbin.org/status/252
3 フレームワークで 252 Cannot Verify User を返す
django
from django.http import JsonResponse
def my_view(request):
return JsonResponse(
{"status": "success"},
status=252,
)
flask
from flask import Flask, jsonify
app = Flask(__name__)
@app.route("/endpoint")
def my_endpoint():
return jsonify({"status": "success"}), 252
fastapi
from fastapi import FastAPI
from fastapi.responses import JSONResponse
app = FastAPI()
@app.get("/endpoint")
def my_endpoint():
return JSONResponse(
content={"status": "success"},
status_code=252,
)
express.js
// Express.js
app.get('/endpoint', (req, res) => {
res.status(252).json({"status": "success"});
});
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(252)
.body(Map.of("error", "cannot_verify_user",
"message", "Cannot Verify User"));
}
}
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(252)
json.NewEncoder(w).Encode(map[string]string{
"error": "cannot_verify_user",
"message": "Cannot Verify User",
})
}
ruby on rails
class MyController < ApplicationController
def my_action
render json: {"status": "success"},
status: :cannot_verify_user
end
end
asp.net core
// ASP.NET Core Minimal API
app.MapGet("/endpoint", () =>
Results.Json(
new { error = "cannot_verify_user", message = "Cannot Verify User" },
statusCode: 252
)
);