# blade create servlet

## 介绍

Servlet 是 Java 的 web 的接口规范，Java web 服务器都遵循此规范实现。本场景主要模拟 Java Web 请求延迟、异常场景。

* \[blade create servlet delay]\(blade create servlet delay.md) 请求延迟
* \[blade create servlet throwCustomException]\(blade create servlet throwCustomException.md) 请求异常

## 参数

servlet 通用参数

```
--effect-count string     影响的请求条数
--effect-percent string   影响的请求百分比
--method string           HTTP 请求类型, 例如： GET, POST, or PUT.
--pathinfo string         已废弃
--pid string              java进程号
--process string          java进程名
--querystring string      请求参数，例如http://localhost:8080/dubbodemo/async?name=friend&timeout=2000 中 querystring的值是 name=friend&timeout=2000
--requestpath string      请求 URI，不包含 Context 部分，例如 http://localhost:8080/dubbodemo/async?name=friend&timeout=2000，则 requestpath 的值是 /async，注意要带 /
--servletpath string      已废弃
```

## 实验原理

## 常见问题

Q: 下发规则不生效

A: 在命令后添加 --debug，然后触发业务请求，查看应用进程用户目录下 logs/chaosblade/chaosblade.log 日志，如下：

```
2019-12-09 21:15:12 DEBUG servlet matchers: {"matchers":{"querystring":"name=bobo","servletpath":"/servlet/path","method":"GET","requestpath":"/servlet/path"}}
2019-12-09 21:15:12 INFO  Match rule: {"action":{"name":"delay"},"actionName":"delay","matcher":{"matchers":{}},"target":"servlet"}
```

servlet matchers 日志表示获取应用的匹配数据，Match rule 表示和下发的命令匹配


---

# 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://chaosblade-io.gitbook.io/chaosblade-help-zh-cn/blade-create-servlet.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.