# 响应代码

以下是您在使用 Oxylabs 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="268.0481770833333">错误信息</th><th>描述</th></tr></thead><tbody><tr><td><code>400</code></td><td><code>错误请求</code></td><td>无法理解该请求。请检查请求格式是否正确。</td></tr><tr><td><code>403</code></td><td><code>禁止访问</code></td><td>访问被拒绝：受限制的目标。如果您有任何问题，请联系支持或您的客户经理。</td></tr><tr><td><code>404</code></td><td><code>未找到</code></td><td>指定的域名未找到，或资源不可用。</td></tr><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>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><tr><td><code>500</code></td><td><code>内部服务器错误</code></td><td>我们的服务器遇到了问题。请稍后再试。</td></tr><tr><td><code>502</code></td><td><code>错误网关</code></td><td>代理从上游服务器或目标服务器收到了无效响应。</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>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></tbody></table>


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