> For the complete documentation index, see [llms.txt](https://developers.oxylabs.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://developers.oxylabs.io/products/cn/web-scraper-api/usage-and-billing/rate-limits.md).

# 速率限制

## 简介

网页爬虫API 用户账户附带特定的任务提交速率限制，具体取决于您的套餐。这些限制旨在有效满足您的月度订阅需求。

## 速率限制

您可提交任务的速率取决于您的套餐规模。常规套餐和企业套餐的速率限制明细请参见下表：

<table><thead><tr><th width="203">套餐</th><th width="187">结果（最大值）</th><th width="179">总任务/秒</th><th>渲染任务/秒</th></tr></thead><tbody><tr><td>免费试用</td><td>2,000</td><td>10</td><td>3</td></tr><tr><td>微型</td><td>98,000</td><td>50</td><td>13</td></tr><tr><td>入门</td><td>220,000</td><td>50</td><td>13</td></tr><tr><td>高级</td><td>622,500</td><td>50</td><td>13</td></tr><tr><td>进阶</td><td>1,350,000</td><td>50</td><td>13</td></tr><tr><td>商务版</td><td>3,330,000</td><td>100</td><td>25</td></tr><tr><td>企业版</td><td>8,000,000</td><td>100</td><td>25</td></tr><tr><td>自定义 +</td><td>自定义</td><td>自定义</td><td>自定义</td></tr></tbody></table>

## 获取速率限制信息

每当您向我们的系统提交任务时，我们都会在响应头中返回速率限制信息。响应头名称的结构如下： `x-ratelimit-limit_name-limit` 以及 `x-ratelimit-limit_name-remaining`。前者表示总限制值，后者表示剩余值。您可能适用多个限制。

<figure><img src="/files/ad75ef484dd0c53c8879d1f6bf15abd5e4aea3e8" alt=""><figcaption></figcaption></figure>

## 由于成功率较低而限制域名访问

网页爬虫API 会持续监控您抓取的每个域名的成功率。如果某个域名的成功率低于 40%（按最近 5 分钟窗口统计），则您对该域名的请求速率将限制为 1 req/s，直到成功率恢复。

成功率较低可能有两个原因：

* 网页爬虫API 无法处理网站的机器人流量控制系统；
* 您自己的 Cookie、标头或其他变量干扰了网页爬虫API 的网页访问逻辑。

当由于成功率较低而限制您对某个域名的请求时，您将收到带有以下内容的 API 响应： `429` 状态码以及以下消息：

{% code overflow="wrap" %}

```json
{
    "message": "由于成功率较低，访问 {domain} 已被限制为 1 req/s。如果您正在使用自定义标头或 Cookie，请确保它们正确，然后重试。成功率提升后，正常请求限制将自动恢复。"
}
```

{% endcode %}

收到此响应后，请确认您的请求参数不是导致此问题的原因。


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