SIP
模拟 439 First Hop Lacks Outbound Support 响应
The first outbound proxy does not support the SIP outbound mechanism (RFC 5626) that the UA is trying to use.
查看完整参考 →1 HTTP 响应
HTTP/1.1 439 First Hop Lacks Outbound Support
Content-Type: application/json
Date: Tue, 25 Feb 2026 12:00:00 GMT
Content-Length: 92
{
"error": "first_hop_lacks_outbound_support",
"message": "First Hop Lacks Outbound Support"
}
2 使用 curl 测试
curl -i https://httpbin.org/status/439
3 在您的框架中返回 439 First Hop Lacks Outbound Support
django
from django.http import JsonResponse
def my_view(request):
return JsonResponse(
{"error": "first_hop_lacks_outbound_support", "message": "First Hop Lacks Outbound Support"},
status=439,
)
flask
from flask import Flask, jsonify
app = Flask(__name__)
@app.route("/endpoint")
def my_endpoint():
return jsonify({"error": "first_hop_lacks_outbound_support", "message": "First Hop Lacks Outbound Support"}), 439
fastapi
from fastapi import FastAPI
from fastapi.responses import JSONResponse
app = FastAPI()
@app.get("/endpoint")
def my_endpoint():
return JSONResponse(
content={"error": "first_hop_lacks_outbound_support", "message": "First Hop Lacks Outbound Support"},
status_code=439,
)
express.js
// Express.js
app.get('/endpoint', (req, res) => {
res.status(439).json({"error": "first_hop_lacks_outbound_support", "message": "First Hop Lacks Outbound Support"});
});
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(439)
.body(Map.of("error", "first_hop_lacks_outbound_support",
"message", "First Hop Lacks Outbound Support"));
}
}
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(439)
json.NewEncoder(w).Encode(map[string]string{
"error": "first_hop_lacks_outbound_support",
"message": "First Hop Lacks Outbound Support",
})
}
ruby on rails
class MyController < ApplicationController
def my_action
render json: {"error": "first_hop_lacks_outbound_support", "message": "First Hop Lacks Outbound Support"},
status: :first_hop_lacks_outbound_support
end
end
asp.net core
// ASP.NET Core Minimal API
app.MapGet("/endpoint", () =>
Results.Json(
new { error = "first_hop_lacks_outbound_support", message = "First Hop Lacks Outbound Support" },
statusCode: 439
)
);