401 Unauthorized

100 Continue 101 Switching Protocols 102 Processing 103 Early Hints 200 OK 201 Created 202 Accepted 203 Non-Authoritative Information 204 No Content 205 Reset Content 206 Partial Content 207 Multi-Status

Idempotency Safe Methods Content Negotiation Status Code Reason Phrase Media Type (MIME Type) Response Header Request Method (HTTP Verb) Redirect Cookie Session HTTP/2 HTTP/3 REST (Representational State Transfer) GraphQL Keep-Alive Chunked Transfer Encoding Conditional Request Range Request Trailer Headers Rate Limiting Pagination API Versioning Content-Type Accept Header HATEOAS Idempotency Key Webhook API Gateway OpenAPI Specification GraphQL Query REST Constraints API Throttling Request Body Response Body SDK (Software Development Kit) API Deprecation Bulk Operations Hypermedia JSON:API TLS Handshake TLS Certificate (SSL Certificate) CORS (Cross-Origin Resource Sharing) Cipher Suite Authentication XSS (Cross-Site Scripting) CSRF (Cross-Site Request Forgery) SQL Injection HSTS (HTTP Strict Transport Security) CSP (Content Security Policy) OAuth 2.0 JWT (JSON Web Token) API Key Bearer Token Mutual TLS (mTLS) Rate Limit Bypass Same-Origin Policy Clickjacking SSRF (Server-Side Request Forgery) Security Headers TCP/IP Three-Way Handshake Port Number Latency Timeout Load Balancer Reverse Proxy NAT (Network Address Translation) Firewall Proxy Server (Forward Proxy) DNS over HTTPS (DoH) IPv6 Connection Pooling TCP Reset (RST) Socket UDP (User Datagram Protocol) Bandwidth DNS Lookup Cache-Control ETag (Entity Tag) CDN (Content Delivery Network) Stale-While-Revalidate Cache Invalidation Edge Caching Last-Modified Vary Header Cache Busting HTTP Compression Prefetching Time to First Byte (TTFB) Connection Reuse Brotli Compression HTTP Caching Layers Cache Hit Ratio Push Cache (HTTP/2) Immutable Response Service Worker Cache 103 Early Hints Retry Strategy Circuit Breaker Graceful Degradation Fallback Error Boundary Dead Letter Queue Health Check Timeout Budget Problem Details (RFC 9457) Exponential Backoff Jitter Thundering Herd Bulkhead Pattern Error Code Mapping Idempotent Retry Error Rate Fail Open / Fail Closed Retry-After Header Request-Response Model RFC (Request for Comments) IANA (Internet Assigned Numbers Authority) Protocol Upgrade Multiplexing Backward Compatibility Serialization Protocol Negotiation Message Framing Extension Mechanism Connection-Oriented Connectionless Half-Duplex ALPN (Application-Layer Protocol Negotiation) Text vs Binary Protocol Head-of-Line Blocking QUIC WebRTC (Web Real-Time Communication) Signaling Server-Sent Events (SSE) Long Polling Event Stream gRPC-Web Service Mesh Sidecar Proxy Ingress Controller Service Discovery Load Balancing Algorithm Blue-Green Deployment Canary Deployment Health Check Endpoint TLS Termination Connection Draining Distributed Tracing Observability Correlation ID Rate Limiter Algorithm Container Orchestration Rolling Update Readiness Probe SLA / SLO / SLI Configuration Management Zero-Downtime Deployment HTTP Semantics (RFC 9110) URI (Uniform Resource Identifier) MIME Type CORS Preflight Content-Disposition Transfer-Encoding Link Header Origin Referrer-Policy Permissions Policy HSTS Preload Structured Headers (RFC 8941) Early Hints (103) Certificate Transparency Subresource Integrity (SRI) Web Linking (RFC 8288) Proxy Authentication Conditional Headers X-Forwarded-For Content-Encoding gRPC-Gateway RPC (Remote Procedure Call) WebDAV (Web Distributed Authoring and Versioning) Transfer Integrity File Locking Bandwidth Throttling OAuth Authorization Code Flow OAuth Client Credentials Flow OAuth Implicit Flow (Legacy) PKCE (Proof Key for Code Exchange) OIDC (OpenID Connect) Refresh Token Access Token Token Introspection (RFC 7662) Token Revocation (RFC 7009) OAuth Scopes JWT Claims JWK (JSON Web Key) SAML (Security Assertion Markup Language) SSO (Single Sign-On) MFA (Multi-Factor Authentication) TOTP (Time-Based One-Time Password) HTTP Basic Authentication HTTP Digest Authentication Session Token Passkey (WebAuthn) TLS Versions TLS 1.3 Certificate Authority (CA) Certificate Chain Certificate Pinning Certificate Transparency (CT) Forward Secrecy (PFS) SNI (Server Name Indication) OCSP (Online Certificate Status Protocol) OCSP Stapling Let's Encrypt ACME Protocol (RFC 8555) TLS Session Resumption 0-RTT (Zero Round Trip Time) Key Exchange PKI (Public Key Infrastructure) SSL Stripping CT Log (Certificate Transparency Log) TLS Fingerprinting (JA3/JA4) Post-Quantum TLS Layer 4 Load Balancing Layer 7 Load Balancing Sticky Sessions (Session Affinity) Consistent Hashing Weighted Round Robin Least Connections Forward Proxy Transparent Proxy PROXY Protocol HAProxy Nginx (as Reverse Proxy) Envoy Proxy SSL Offloading GSLB (Global Server Load Balancing) Backend Pool Failover Request Routing Active-Passive HA Connection Multiplexing (Proxy) xDS (Discovery Service Protocol)