Claude API连接失败排查指南：从网络配置到错误处理的最佳实践

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DNS 解析失败
错误特征：Failed to resolve host 'api.claude.ai'
常见于本地 DNS 配置错误或域名服务商故障
403 认证错误
错误特征：{"code": 403, "message": "Invalid API key"}
可能由过期 / 错误的 API Key 或 IP 白名单限制引起
504 网关超时
错误特征：504 Gateway Time-out
通常因网络延迟或服务端处理能力不足导致

终端诊断命令：

# 检查 DNS 解析
dig api.claude.ai +short

# 测试端口连通性
telnet api.claude.ai 443

# 完整请求测试
curl -v https://api.claude.ai/v1/ping

Python（requests）：

from typing import Optional
import requests

def call_api(timeout: float = 30.0) -> Optional[dict]:
    try:
        resp = requests.post(
            'https://api.claude.ai/v1/completions',
            headers={'Authorization': 'Bearer YOUR_KEY'},
            json={'prompt': 'test'},
            timeout=(3.0, timeout)  # 连接 / 读取双超时
        )
        resp.raise_for_status()
        return resp.json()
    except requests.exceptions.RequestException as e:
        print(f"API call failed: {type(e).__name__}")
        return None

Node.js（axios）：

const axios = require('axios');

async function callApi(timeout = 30000) {
  try {
    const response = await axios({
      method: 'post',
      url: 'https://api.claude.ai/v1/completions',
      headers: {'Authorization': 'Bearer YOUR_KEY'},
      data: {prompt: 'test'},
      timeout: timeout
    });
    return response.data;
  } catch (err) {console.error(`API error: ${err.code || err.message}`);
    throw err;
  }
}

Python 实现：

import random
import time
from math import exp

def exponential_backoff(
    max_retries: int = 5,
    base_delay: float = 1.0,
    max_delay: float = 30.0
):
    def decorator(func):
        def wrapper(*args, **kwargs):
            retries = 0
            while retries < max_retries:
                try:
                    return func(*args, **kwargs)
                except Exception as e:
                    retries += 1
                    if retries >= max_retries:
                        raise

                    # 计算带抖动的延迟
                    delay = min(base_delay * exp(retries) + random.uniform(0, 1),
                        max_delay
                    )
                    time.sleep(delay)
        return wrapper
    return decorator

@exponential_backoff()
def safe_api_call():
    return call_api()

检查出站规则是否放行*.claude.ai:443
注意代理服务器可能修改 TLS SNI 字段