> For the complete documentation index, see [llms.txt](https://krjaeh0.gitbook.io/j-log/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://krjaeh0.gitbook.io/j-log/security/bwapp/doubleencoding.md).

# DoubleEncoding

개념 요약: 이미 URL 인코딩된 문자열에서 '%' 문자를 다시 인코딩하면 "한번 더 인코딩(double encoding)"이 됩니다. '%'는 인코딩 시 `%25`가 되므로, 기존의 인코딩 결과에서 `%`가 있는 모든 부분을 다시 `%25`로 바꿔주면 됩니다.

예시:

* '<' 는 한 번 인코딩하면 `%3c`
* 이 값을 다시 인코딩하면 `%` → `%25` 변환으로 `%253c`

간단한 변환 규칙:

* 원래: `<` → `%3c`
* 다시 인코딩: `%3c` → `%25` + `3c` → `%253c`

(참고: 원문 링크: DoubleEncoding.md)


---

# Agent Instructions
This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com.

## 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, and the optional `goal` query parameter:

```
GET https://krjaeh0.gitbook.io/j-log/security/bwapp/doubleencoding.md?ask=<question>&goal=<endgoal>
```

`ask` is the immediate question: it should be specific, self-contained, and written in natural language.
`goal` is optional and describes the broader end goal you are ultimately trying to accomplish on behalf of the user. GitBook uses it to tailor the answer towards what is most useful for that goal.

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.