koriweb
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W3Schools 튜토리얼을 P-Reinforce v3.1 포맷으로 위키화(영어 본문, 한/영 섹션 헤더). - Topic_HTML: 59문서 (튜토리얼+예제, 레퍼런스/메타 제외) - Topic_CSS: 190문서 (메인 + Advanced/Flexbox/Grid/RWD 전체) - Topic_JavaScript: 120문서 (코어 언어; Temporal/DOM상세/BOM/WebAPI/AJAX/jQuery/Graphics 등은 후속) 각 폴더 00_INDEX.md(MOC) 포함. 코드 verbatim, 미확인분은 "Not found in source" 표기. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
123 lines
5.4 KiB
Markdown
123 lines
5.4 KiB
Markdown
---
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id: html-url-encode
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title: "HTML URL Encode"
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category: "Frontend"
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status: "draft"
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verification_status: "conceptual"
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canonical_id: ""
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aliases: ["URL encoding", "percent encoding", "URL", "Uniform Resource Locator", "URL schemes", "ASCII URL encoding"]
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duplicate_of: ""
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source_trust_level: "B"
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confidence_score: 0.88
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created_at: 2026-06-23
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updated_at: 2026-06-23
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review_reason: ""
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merge_history: []
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tags: ["html", "web", "frontend", "url", "encoding", "w3schools"]
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raw_sources: ["https://www.w3schools.com/html/html_urlencode.asp"]
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applied_in: []
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github_commit: ""
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---
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# [[HTML URL Encode]]
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## 🎯 한 줄 통찰 (One-line insight)
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A URL (Uniform Resource Locator) is a web address that can only be sent over the Internet using the ASCII character set, so non-ASCII characters are **URL-encoded** — replaced by a `%` followed by hexadecimal digits (and spaces by `+` or `%20`). [S1]
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## 🧠 핵심 개념 (Core concepts)
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- **URL** — a Uniform Resource Locator is a web address used to request pages from web servers. [S1]
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- **URL syntax** — a URL follows the structure `scheme://prefix.domain:port/path/filename`. [S1]
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- **Schemes** — the type of Internet service (http, https, ftp, file). [S1]
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- **Why encoding is needed** — URLs can only be sent over the Internet using the ASCII character set; characters outside ASCII must be encoded. [S1]
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- **Encoding scheme** — non-ASCII characters become `%` + hexadecimal digits; spaces become `+` or `%20`. [S1]
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- **Default charset** — the default character set in HTML5 is UTF-8. [S1]
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## 🧩 추출된 패턴 (Extracted patterns)
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- **URL syntax pattern** — `scheme://prefix.domain:port/path/filename`. [S1]
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- **Percent-encoding pattern** — `%HH` where `HH` is the hexadecimal value of the byte (e.g. `%20` for a space). [S1]
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- **Space encoding** — `+` or `%20`. [S1]
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- **Multi-byte UTF-8 encoding** — one character may expand to several `%HH` pairs (e.g. © → `%C2%A9` in UTF-8). [S1]
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## 📖 세부 내용 (Details)
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**URL — Uniform Resource Locator**
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A URL is a web address used to request pages from web servers. The basic syntax is: [S1]
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```
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scheme://prefix.domain:port/path/filename
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```
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Syntax components: [S1]
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| Component | Meaning |
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|---|---|
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| `scheme` | The type of Internet service (http or https are most common) |
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| `prefix` | The domain prefix (default for http is `www`) |
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| `domain` | The Internet domain name (e.g. `w3schools.com`) |
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| `port` | The port number at the host (default for http is `80`) |
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| `path` | The path at the server (root directory if omitted) |
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| `filename` | The name of the document or resource |
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**Common URL Schemes** [S1]
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| Scheme | Short for | Used for |
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|---|---|---|
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| http | HyperText Transfer Protocol | Common web pages. Not encrypted |
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| https | Secure HyperText Transfer Protocol | Secure web pages. Encrypted |
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| ftp | File Transfer Protocol | Downloading or uploading files |
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| file | — | A file on your computer |
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**URL Encoding**
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URLs can only be sent over the Internet using the ASCII character set. If a URL contains characters outside the ASCII set, it has to be converted. URL encoding replaces non-ASCII characters with a `%` followed by hexadecimal digits. URLs cannot contain spaces; a space is encoded with `+` or `%20`. The default character set in HTML5 is UTF-8. [S1]
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**ASCII Encoding Examples** [S1]
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| Character | From Windows-1252 | From UTF-8 |
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|---|---|---|
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| € | %80 | %E2%82%AC |
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| £ | %A3 | %C2%A3 |
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| © | %A9 | %C2%A9 |
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| ® | %AE | %C2%AE |
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| À | %C0 | %C3%80 |
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| Á | %C1 | %C3%81 |
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| Â | %C2 | %C3%82 |
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| Ã | %C3 | %C3%83 |
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| Ä | %C4 | %C3%84 |
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| Å | %C5 | %C3%85 |
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(Ten character mappings shown; the page references a complete URL encoding reference guide elsewhere.) [S1]
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## 🛠️ 적용 사례 (Applied in summary)
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The ASCII encoding examples above are the canonical applied case: converting characters such as © to `%C2%A9` (UTF-8) so they can travel safely inside a URL. No external project/commit applications found in the source.
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## 💻 코드 패턴 (Code patterns)
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URL structure (syntax template):
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```
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scheme://prefix.domain:port/path/filename
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```
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Percent-encoded values (examples):
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```
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space -> %20 (or +)
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© -> %C2%A9 (UTF-8)
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€ -> %E2%82%AC (UTF-8) / %80 (Windows-1252)
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```
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## ⚖️ 모순 및 업데이트 (Contradictions & updates)
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No contradictions found in the source. Note that the same character encodes differently depending on the source character set (e.g. € is `%80` from Windows-1252 but `%E2%82%AC` from UTF-8); HTML5's default UTF-8 governs modern encoding. [S1]
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## ✅ 검증 상태 및 신뢰도
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- **상태:** draft
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- **검증 단계:** conceptual (실제 적용 사례 발견 시 applied/validated로 승격 가능)
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- **출처 신뢰도:** B (W3Schools — widely used educational reference, not a primary standards body)
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- **신뢰 점수:** 0.88
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- **중복 검사 결과:** 신규 생성 (New discovery)
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## 🔗 지식 그래프 (Knowledge Graph)
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- **상위/루트:** [[HTML Tutorial]]
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- **관련 개념:** [[HTML Charsets]], [[HTML Symbols]], [[HTML Links]], [[HTML Forms]]
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- **참조 맥락:** Referenced when constructing or transmitting web addresses, especially query strings and links containing special characters.
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## 📚 출처 (Sources)
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- [S1] W3Schools — HTML URL Encode — https://www.w3schools.com/html/html_urlencode.asp
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## 📝 변경 이력 (Change history)
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- 2026-06-23: Initial draft synthesized from the W3Schools "HTML URL Encode" page (Astra wiki-curation, P-Reinforce v3.1 format).
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