πŸƒβ€β™€οΈ
Today I Learned
  • Today I Learned
  • algorithm
    • Binary Search (이진 탐색)
    • Brute Force Search (완전탐색)
    • DFS와 BFS
    • Dijkstra Algorithm (λ‹€μ΅μŠ€νŠΈλΌ μ•Œκ³ λ¦¬μ¦˜)
    • Dynamic Programming (동적 κ³„νšλ²•)
    • Floyd-Warshall Algorithm (ν”Œλ‘œμ΄λ“œ-μ›Œμ…œ μ•Œκ³ λ¦¬μ¦˜)
    • Greedy
    • μ •λ ¬ μ•Œκ³ λ¦¬μ¦˜(Sorting Algorithm)
  • data-structure
    • Array, List, LinkedList
    • Graph vs Tree
    • Hash, Map, HashMap
    • Heap
    • Stack, Queue (μŠ€νƒ, 큐)
  • database
    • Database Lock
    • Execution Plan
    • Index
    • Join Algorithm
    • MySQL μ‚¬μš©μž κΆŒν•œλΆ€μ—¬
    • Normalization (μ •κ·œν™”)
    • Row-Oriented vs Column-Oriented
    • Transaction
    • νŠΈλžœμž­μ…˜ 격리 μˆ˜μ€€ (Transaction Isolation Level)
    • VARCHAR의 κΈΈμ΄μ œν•œ
  • λ””μžμΈ νŒ¨ν„΄μ˜ μ’…λ₯˜
    • Abstract Factory Pattern
    • Adapter Pattern
    • Bridge Pattern
    • Builder Pattern
    • Chain of Responsibility Pattern
    • Class Diagram
    • Command Pattern
    • Composite Pattern
    • Decorator Pattern
    • Facade Pattern
    • Factory Method Pattern (νŒ©ν† λ¦¬ λ©”μ†Œλ“œ νŒ¨ν„΄)
    • Flyweight Pattern
    • Iterator Pattern
    • Mediator Pattern
    • Memento Pattern
    • Observer Pattern
    • Prototype Pattern
    • Proxy Pattern
    • SOLID
    • Singleton Pattern
    • State Pattern
    • Strategy Pattern
    • Template Method
    • UML
    • 객체지ν–₯_νŒ¨λŸ¬λ‹€μž„
  • docker
    • Docker
    • Docker Network
  • etc
    • Block vs Non-block, Sync vs Async
  • git
    • Git Merge vs Git Rebase
    • 자주 μ‚¬μš©ν•˜λŠ” Git λͺ…λ Ήμ–΄ λͺ¨μŒ
  • java
    • Annotation
    • Exception Handling (μ˜ˆμ™Έ 처리)
    • Generic
    • JVM
    • Java μ½”λ“œμ˜ μ‹€ν–‰ κ³Όμ •
    • Lambda Expression
    • Object Class
    • Optional
    • Primitive Type & Reference Type
    • Reflection
    • Serialize And Deserialize
    • Stream
    • String, StringBuilder, StringBuffer
    • Tiles
    • Type Casting
    • μ™œ Java의 μ •λ ¬ ν•¨μˆ˜ sort()λŠ” static λ©”μ†Œλ“œμΌκΉŒ?
    • μΆ”μƒν΄λž˜μŠ€μ™€ μΈν„°νŽ˜μ΄μŠ€μ˜ 차이
    • effective-java
      • Item 1. μƒμ„±μž λŒ€μ‹  정적 νŒ©ν† λ¦¬ λ©”μ„œλ“œλ₯Ό κ³ λ €ν•˜λΌ
      • Item 10. equalsλŠ” 일반 κ·œμ•½μ„ μ§€μΌœ μž¬μ •μ˜(μ˜€λ²„λΌμ΄λ”©)ν•˜λΌ
      • Item 11. equalsλ₯Ό μ˜€λ²„λΌμ΄λ”©ν•  κ±°λ©΄ hashCode도 μ˜€λ²„λΌμ΄λ”©ν•˜λΌ
      • Item 12. toString은 항상 μ˜€λ²„λΌμ΄λ”©ν•˜λΌ
      • Item 13. clone μ˜€λ²„λΌμ΄λ”©μ€ μ£Όμ˜ν•΄μ„œ μ§„ν–‰ν•˜λΌ
      • Item 14. Comparable을 κ΅¬ν˜„ν• μ§€ κ³ λ €ν•˜λΌ
      • Item 15. ν΄λž˜μŠ€μ™€ λ©€λ²„μ˜ μ ‘κ·Ό κΆŒν•œμ„ μ΅œμ†Œν™”ν•˜λΌ
      • Item 16. public ν΄λž˜μŠ€μ—μ„œλŠ” public ν•„λ“œκ°€ μ•„λ‹Œ μ ‘κ·Όμž λ©”μ„œλ“œλ₯Ό μ‚¬μš©ν•˜λΌ
      • Item 17. λ³€κ²½ κ°€λŠ₯성을 μ΅œμ†Œν™”ν•˜λΌ
      • Item 18. 상속 λŒ€μ‹  μ»΄ν¬μ§€μ…˜μ„ μ‚¬μš©ν•˜λΌ
      • Item 19. 상속을 κ³ λ €ν•΄ μ„€κ³„ν•˜κ³  λ¬Έμ„œν™”ν•˜λΌ. 그렇지 μ•Šμ•˜λ‹€λ©΄ 상속을 κΈˆμ§€ν•˜λΌ
      • Item 2. μƒμ„±μžμ— λ§€κ°œλ³€μˆ˜κ°€ λ§Žλ‹€λ©΄ λΉŒλ”λ₯Ό κ³ λ €ν•˜λΌ
      • Item 20. 좔상 ν΄λž˜μŠ€λ³΄λ‹€λŠ” μΈν„°νŽ˜μ΄μŠ€λ₯Ό μš°μ„ ν•˜λΌ
      • Item 21. μΈν„°νŽ˜μ΄μŠ€λŠ” κ΅¬ν˜„ν•˜λŠ” μͺ½μ„ 생각해 섀계
      • Item 22. μΈν„°νŽ˜μ΄μŠ€λŠ” νƒ€μž…μ„ μ •μ˜ν•˜λŠ” μš©λ„λ‘œλ§Œ μ‚¬μš©ν•˜λΌ
      • νƒœκ·Έ 달린 ν΄λž˜μŠ€λ³΄λ‹€λŠ” 클래슀 계측ꡬ쑰λ₯Ό ν™œμš©
      • Item 24. 멀버 ν΄λž˜μŠ€λŠ” λ˜λ„λ‘ static으둜 λ§Œλ“€λΌ
      • Top Level ClassλŠ” ν•œ 파일 λ‹Ή ν•˜λ‚˜λ§Œ μ„ μ–Έν•˜λΌ
      • Item 26. 둜우 νƒ€μž…(raw type)은 μ‚¬μš©ν•˜μ§€ 말라
      • Item 27. 비검사 κ²½κ³ λ₯Ό μ œκ±°ν•˜λΌ
      • Item 28. λ°°μ—΄λ³΄λ‹€λŠ” 리슀트λ₯Ό μ‚¬μš©ν•˜λΌ
      • Item 29. 이왕이면 μ œλ„€λ¦­ νƒ€μž…μœΌλ‘œ(클래슀둜) λ§Œλ“€λΌ
      • Item 3. private μƒμ„±μžλ‚˜ μ—΄κ±° νƒ€μž…μœΌλ‘œ μ‹±κΈ€ν„΄μž„μ„ λ³΄μ¦ν•˜λΌ
      • Item 4. μΈμŠ€ν„΄μŠ€ν™”λ₯Ό λ§‰μœΌλ €κ±°λ“  private μƒμ„±μžλ₯Ό μ‚¬μš©ν•˜λΌ
      • Item 5. μžμ›μ„ 직접 λͺ…μ‹œν•˜μ§€ 말고 의쑴 객체 μ£Όμž…μ„ μ‚¬μš©ν•˜λΌ
      • Item 6. λΆˆν•„μš”ν•œ 객체 생성을 ν”Όν•˜λΌ
      • Item 7. λ‹€ μ“΄ 객체 μ°Έμ‘°λ₯Ό ν•΄μ œν•˜λΌ
      • Item 8. finalizer와 cleaner의 μ‚¬μš©μ„ ν”Όν•˜λΌ
      • Item 9. try-finallyλ³΄λ‹€λŠ” try-with-resourcesλ₯Ό μ‚¬μš©ν•˜λΌ
  • linux
    • Linux의 Permission
  • network
    • OSI 7 Layer
    • Subnet
    • 그림으둜_λ°°μš°λŠ”_http_&_network_basic
  • python
    • 파이썬의 μž¬κ·€ μ œν•œ(Recursion Limit)
  • server
    • CI & CD
    • Cache
    • Cloud Service
    • REST API
    • 정적 μ„œλ²„(Web Server)와 동적 μ„œλ²„(Web Application Server, WAS)
  • spring
    • Configuration
    • @RequestParam, @RequestBody, @ModelAttribute
    • AOP (Aspect Oriented Programming)
    • μ˜μ‘΄μ„± μžλ™ μ£Όμž…
    • Bean Scope (빈의 유효 λ²”μœ„)
    • [Error] Bean could not be injected because it is a JDK dynamic proxy
    • Component Scan
    • πŸ±β€πŸ‘€ Component vs Bean
    • μ—¬λŸ¬ 개의 @Configuration(μ„€μ • 파일)을 μ‚¬μš©ν•˜λŠ” 방법
    • DI (Dependency Injection, μ˜μ‘΄μ„± μ£Όμž…)
    • Filter, Interceptor, (Spring) AOP
    • IoC Container
    • Nested Class의 Bean 등둝
    • Profile
    • Properties
    • Spring Bean의 생λͺ…μ£ΌκΈ°(life-cycle)
    • Spring vs Spring Boot
    • Thymeleaf
    • jpa
      • Dirty Checking
      • JPA의 Fetch μ „λž΅
      • JPA N+1 Problem
    • spring-boot
      • Spring Web Layer (μŠ€ν”„λ§ μ›Ή 계측)
      • Spring Boot
    • spring-mvc
      • Argument Resolver
      • Filter
      • Interceptor
      • RestController
      • Validator
      • Exception Handling
      • Spring MVC
    • spring-security
      • Spring Security
  • testing
    • Test Double (ν…ŒμŠ€νŠΈ 더블)
    • ν™”μ΄νŠΈλ°•μŠ€ ν…ŒμŠ€νŠΈ, λΈ”λž™λ°•μŠ€ ν…ŒμŠ€νŠΈ
  • web
    • Browser Caching
    • CORS
    • HTTP Header
    • HTTP와_HTTPS
    • πŸ›‘οΈOAuth
    • PRG Pattern
    • Query Parameter, Path Variable
    • πŸŸ’πŸŸ‘πŸ”΄ Status Code (μƒνƒœ μ½”λ“œ)
    • WebSocket
    • application/octet-stream
    • Cookie-Session
    • JWT
    • multipart/form-data
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Last updated 1 year ago

λ“±μž₯ λ°°κ²½

HTTP ν”„λ‘œν† μ½œμ„ μ΄μš©ν•œ 톡신은 기본적으둜 단방ν–₯이닀. Clientλ‘œλΆ€ν„° μƒμ„±λœ Request Packet이 μ„œλ²„μ—κ²Œ μ „λ‹¬λ˜λ©΄, μ„œλ²„λŠ” 이에 λŒ€ν•œ Reseponse Packet을 μ œκ³΅ν•˜λŠ” λ°©μ‹μœΌλ‘œ 톡신이 이루어진닀.

μ΄λŸ¬ν•œ 단방ν–₯ ν†΅μ‹ μ˜ 단점은 μ„œλ²„μ— λ³€ν™”κ°€ μžˆλ”λΌλ„, λ°˜λ“œμ‹œ ν΄λΌμ΄μ–ΈνŠΈκ°€ μš”μ²­μ„ ν•΄μ•Ό ν•΄λ‹Ή λ³€ν™”λ₯Ό 확인할 수 μžˆλ‹€λŠ” 것이닀. μ›Ήμ†ŒμΌ“μ€ μ„œλ²„κ°€ μš”μ²­ 없이도 ν΄λΌμ΄μ–ΈνŠΈμ—κ²Œ 데이터λ₯Ό 전솑할 수 μžˆλ„λ‘ μ–‘λ°©ν–₯ 톡신 ν™˜κ²½μ„ μ œκ³΅ν•¨μœΌλ‘œμ¨ μ΄λŸ¬ν•œ 단점을 ν•΄κ²°ν•œλ‹€.

WebSocket (μ›Ήμ†ŒμΌ“)

μ •μ˜

μ„œλ²„μ™€ ν΄λΌμ΄μ–ΈνŠΈ κ°„ μ–‘λ°©ν–₯ 톡신을 μœ„ν•œ ν”„λ‘œν† μ½œ

ws://둜 μ‹œμž‘ν•˜λ©°, TCP/IP 기반으둜 λ™μž‘ν•œλ‹€.

λ™μž‘ 원리

  1. ν΄λΌμ΄μ–ΈνŠΈκ°€ μ„œλ²„μ—κ²Œ ν•Έλ“œμ‰μ΄ν‚Ή(websocket 연결을 μœ„ν•œ ν˜‘μƒ)에 ν•΄λ‹Ήν•˜λŠ” HTTP μš”μ²­ 전솑

    • HTTP 1.1 μ΄μƒμ˜ 버전을 μ‚¬μš©ν•΄μ•Ό 함

    • HTTP λ©”μ†Œλ“œλŠ” λ°˜λ“œμ‹œ GET

    • Upgrade: websocket 헀더λ₯Ό 포함

    • Connection: Upgrade 헀더λ₯Ό 포함

    • ν΄λΌμ΄μ–ΈνŠΈ/μ„œλ²„ κ°„ 인증을 μœ„ν•œ Sec-WebSocket-Key 헀더λ₯Ό 포함

    • μ„œλ²„κ°€ μ›Ήμ†ŒμΌ“ 버전을 인식할 수 μ—†λŠ” 경우 버전 λͺ…μ‹œλ₯Ό μœ„ν•΄ Sec-WebSocket-Version 헀더λ₯Ό 포함

  2. μ„œλ²„λŠ” 1번 μš”μ²­μ— λŒ€ν•œ 응닡을 전솑

    • μ΄μ œλΆ€ν„° μ›Ήμ†ŒμΌ“ ν”„λ‘œν† μ½œμ„ μ‚¬μš©ν•  κ²ƒμ΄λΌλŠ” μƒνƒœ μ½”λ“œ 101을 μ‚¬μš©

    • λ§ˆμ°¬κ°€μ§€λ‘œ Upgrade, Connection 헀더λ₯Ό 포함

    • ν΄λΌμ΄μ–ΈνŠΈμ˜ Sec-WebSocket-Key 값을 κ³Ό 이어 뢙이고 SHA-1 ν•΄μ‹œ μ•Œκ³ λ¦¬μ¦˜μœΌλ‘œ μ•”ν˜Έν™”ν•˜κ³  base64둜 μΈμ½”λ”©ν•œ 값을 담은 Sec-WebSocket-Accept 헀더λ₯Ό 포함

    • λ§Œμ•½ 연결에 μ‹€νŒ¨ν–ˆλ‹€λ©΄ μ„œλ²„λŠ” μ¦‰μ‹œ 400을 λ°˜ν™˜ν•˜κ³  μ¦‰μ‹œ μ†ŒμΌ“μ„ μ’…λ£Œν•΄μ•Ό 함

  3. μ„±κ³΅μ μœΌλ‘œ ν”„λ‘œν† μ½œμ΄ μ›Ήμ†ŒμΌ“(ws)으둜 λ³€κ²½λœ 경우, 이제 μ„œλ²„μ™€ ν΄λΌμ΄μ–ΈνŠΈλŠ” μ–Έμ œλ“  λ©”μ‹œμ§€λ₯Ό 전솑할 수 μžˆλ‹€. (즉, μ–‘λ°©ν–₯ 톡신을 ν•  수 μžˆλ‹€.)

  • λ“±μž₯ λ°°κ²½
  • WebSocket (μ›Ήμ†ŒμΌ“)
  • μ •μ˜
  • λ™μž‘ 원리
PreviousπŸŸ’πŸŸ‘πŸ”΄ Status Code (μƒνƒœ μ½”λ“œ)Nextapplication/octet-stream
  1. web

WebSocket

맀직 슀트링
GET /chat HTTP/1.1
Host: example.com:8000
Upgrade: websocket
Connection: Upgrade
Sec-WebSocket-Key: dGhlIHNhbXBsZSBub25jZQ==
Sec-WebSocket-Version: 13
// Success
HTTP/1.1 101 Switching Protocols
Upgrade: websocket
Connection: Upgrade
Sec-WebSocket-Accept: s3pPLMBiTxaQ9kYGzzhZRbK+xOo=
// Fail
HTTP/1.1 400 Bad Request