Current Implementation Analysis (first generation)
✅ Features Currently Implemented:
✅ HTTP Methods - Full support (GET, POST, PUT, PATCH, DELETE, HEAD, OPTIONS)
✅ URL Input - With auto-protocol fixing (google.com → https://google.com)
✅ Query Parameters - Key-value UI with checkboxes
✅ Custom Headers - Key-value UI with checkboxes
✅ Basic Authentication - Bearer Token, Basic Auth, API Key (header/query)
✅ Raw Body Input - Basic textarea with JSON detection
✅ URL-encoded Body - Key-value form
✅ Response Viewer - Body and Headers tabs
✅ Response Timing - Shows ms and bytes
✅ Status Badges - Color-coded status indicators
✅ Loading States - Button loading, proper UX
✅ Error Handling - Network errors, timeouts, invalid URLs
✅ Notifications - Success/error toasts
✅ Request History - In-memory tracking
✅ Responsive Layout - Fixed viewport constraints
⚠️ Partially Implemented:
⚠️ Collections - Data structure exists but no UI/persistence
⚠️ Environments - Data structure exists but no UI/persistence
⚠️ Form-data Body - Basic structure but no file uploads
⚠️ JSON Editor - Basic textarea, no beautify/minify
❌ Missing Critical Features:
❌ OAuth2 Flow - Complete authorization flow
❌ File Uploads - Form-data with file input
❌ Code Generation - curl, axios, fetch snippets
❌ Response Export - JSON, CSV download
❌ Test Scripts - pm.test-like functionality
❌ Import/Export - Postman collections, OpenAPI
❌ Environment Variables - {{variable}} substitution
❌ Response Timeline - Performance waterfall
❌ Cookies Tab - Cookie management
❌ Test Results Tab - Script execution results
❌ JSON Beautify/Copy - Formatting tools
❌ GraphQL Support - Query editor
❌ XML/HTML Support - Syntax highlighting
❌ Collections Sidebar - Tree view, organization
❌ Environment Selector - Dropdown switcher

🚀 Phase-by-Phase Implementation Roadmap

Phase 2: Enhanced Body Types & JSON Tools 
Goal: Complete the request body functionality
Missing Components:
Form-data with File Upload
JSON Beautify/Minify/Copy buttons
Raw body type selector (JSON, XML, Text, HTML)
Syntax highlighting for JSON/XML
Implementation Plan:
Add file input to form-data
Add JSON formatting toolbar
Add body type sub-selector
Integrate Monaco or Ace editor

Phase 3: Collections & Environment Management
Goal: Persistent data management
Missing Components:
Collections sidebar with tree view
Save/Load requests to collections
Environment selector dropdown
Variable substitution ({{baseUrl}})
Persistence layer (localStorage/backend)

Phase 4: Advanced Features
Goal: Power user functionality
Missing Components:
OAuth2 complete flow
Code generation modal
Import/Export functionality
Test scripts tab with execution
Response export options

Phase 5: Enhanced Response Viewer
Goal: Better analysis tools
Missing Components:
Timeline tab with waterfall
Cookies tab with management
Test Results tab
Response search/filter