# 响应代码

以下是在使用 Oxylabs 独享ISP代理时可能遇到的最常见响应代码。

<table><thead><tr><th width="166">响应代码</th><th width="254.33333333333331">错误信息</th><th>描述</th></tr></thead><tbody><tr><td><code>407</code></td><td><code>需要代理身份验证</code></td><td>未提供用户凭据 / 凭据不正确 / 用户正从未列入白名单的 IP 连接。</td></tr><tr><td><code>504</code></td><td><code>网关超时</code></td><td>代理服务器在等待目标服务器响应时超时。通常需要约 60 秒。</td></tr><tr><td><code>503</code></td><td><code>服务不可用</code></td><td>无法连接到目标服务器。DNS 无法解析目标服务器地址。</td></tr><tr><td><code>404</code></td><td><code>未找到</code></td><td>无法找到指定的域名。</td></tr><tr><td><code>500</code></td><td><code>内部服务器错误</code></td><td>我们的服务器出现了问题。请稍后再试。</td></tr><tr><td><code>429</code></td><td><code>请求过多</code></td><td>用户已达到线程/并发会话限制。</td></tr></tbody></table>


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# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://developers.oxylabs.io/products/cn/dai-li/dedicated-isp-proxies/self-service/response-codes.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.