# blade create servlet delay

## 介绍

Java web 请求延迟

## 参数

以下是此场景特有参数，通用参数详见：\[blade create servlet]\(blade create servlet.md)

```
--time string             延迟时间，单位是毫秒，必填项
--offset string           延迟上下浮动时间，例如 --time 3000 --offset 1000，延迟时间的取值范围是 2000-4000 毫秒
```

## 案例

访问 <http://localhost:8080/dubbodemo/servlet/path?name=bob> 请求延迟 3 秒，影响 2 条请求

```
blade c servlet delay --time 3000 --requestpath /servlet/path --effect-count 2

{"code":200,"success":true,"result":"154c866919172119"}
```

访问请求进行验证。

请求参数是 name=family，延迟 2 秒，延迟时间上下浮动 1 秒，影响范围是 50% 的请求，同时开启 debug 日志用于排查问题，命令如下：

```
blade c servlet delay --time 2000 --offset 1000 --querystring name=family --effect-percent 50 --debug

{"code":200,"success":true,"result":"49236d2406d168f4"}
```

监控 应用进程用户目录/logs/chaosblade/chaosblade.log 日志

![](/files/2WZpuEDIi45oTtT5LyCZ)

可以看到下发了 create 指令并开启 debug 日志。 请求两次 <http://localhost:8080/dubbodemo/servlet/path?name=bob> ，由于参数 querystring 和下发的命令不匹配，所以没有生效 随后请求两次 <http://localhost:8080/dubbodemo/servlet/path?name=family，第一次打印了> Match rule 日志，说明匹配成功，延迟生效；第二次打印了 limited by，说明匹配成功，但是由于 effect-percent 参数的限制，所以场景被限制，此请求没有发生延迟

## 实验原理

## 常见问题


---

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