# Page Not Found

The URL `posts/performance` does not exist. This page may have been moved, renamed, or deleted.

## Suggested Pages

You may be looking for one of the following:
- [System.out.println()의 동작 원리와 성능 이슈](https://hyoguoo.gitbook.io/tech-log/posts/java-print-performance.md)
- [Logger 성능 저하 방지와 구조화된 로깅 설계](https://hyoguoo.gitbook.io/tech-log/posts/log-structure-and-performance.md)
- [결제 이력 추적 및 핵심 지표 모니터링 시스템 구현](https://hyoguoo.gitbook.io/tech-log/posts/payment-history-and-metrics.md)
- [null은 오버 로딩된 메서드 중 어떤 메서드를 호출할까?](https://hyoguoo.gitbook.io/tech-log/posts/null-overloading.md)
- [posts](https://hyoguoo.gitbook.io/tech-log/posts.md)

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### Option 1 — Ask a question (recommended)

Perform an HTTP GET request on the documentation index with the `ask` parameter, and the optional `goal` parameter:

```
GET https://hyoguoo.gitbook.io/tech-log/posts/java-print-performance.md?ask=<question>&goal=<end_goal>
```

`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.

### Option 2 — Browse the documentation index

Full index: https://hyoguoo.gitbook.io/tech-log/sitemap.md

Use this to discover valid page paths or navigate the documentation structure.

### Option 3 — Retrieve the full documentation corpus

Full export: https://hyoguoo.gitbook.io/tech-log/llms-full.txt

Use this to access all content at once and perform your own parsing or retrieval. It will be more expensive.

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Prefer `.md` URLs for structured content, append `.md` to URLs (e.g., `/tech-log/posts/java-print-performance.md`).

You may also use `Accept: text/markdown` header for content negotiation.