successful client to server flow, not passing through. overcomplicated. need to refactor based on new fastmcp oauth wrapper

README.md

@@ -53,7 +53,7 @@ A production-ready MCP server that integrates all major Google Workspace service
 
 ## Features
 
-- **🔐 Advanced OAuth 2.0 & OAuth 2.1**: Secure authentication with automatic token refresh, transport-aware callback handling, session management, centralized scope management, and OAuth 2.1 bearer token support for multi-user environments
+- **🔐 Advanced OAuth 2.0 & OAuth 2.1**: Secure authentication with automatic token refresh, transport-aware callback handling, session management, centralized scope management, and OAuth 2.1 bearer token support for multi-user environments with innovative CORS proxy architecture
 - **📅 Google Calendar**: Full calendar management with event CRUD operations
 - **📁 Google Drive**: File operations with native Microsoft Office format support (.docx, .xlsx)
 - **📧 Gmail**: Complete email management with search, send, and draft capabilities
@@ -237,6 +237,7 @@ The server includes OAuth 2.1 support for bearer token authentication, enabling
 - Need for bearer token authentication instead of passing user emails
 - Building web applications or APIs on top of the MCP server
 - Production environments requiring secure session management
+- Browser-based clients requiring CORS support
 
 **Enabling OAuth 2.1:**
 ```bash
@@ -247,6 +248,20 @@ uv run main.py --transport streamable-http
 # and initialize OAuth 2.1 if available
 ```
 
+**Innovative CORS Proxy Architecture:**
+
+This implementation solves two critical challenges when using Google OAuth in browser environments:
+
+1. **Dynamic Client Registration**: Google doesn't support OAuth 2.1 dynamic client registration. Our server provides a clever proxy that accepts any client registration request and returns the pre-configured Google OAuth credentials, allowing standards-compliant clients to work seamlessly.
+
+2. **CORS Issues**: Google's OAuth endpoints don't include CORS headers, blocking browser-based clients. We implement intelligent proxy endpoints that:
+   - Proxy authorization server discovery requests through `/auth/discovery/authorization-server/{server}`
+   - Proxy token exchange requests through `/oauth2/token` 
+   - Add proper CORS headers to all responses
+   - Maintain security by only proxying to known Google OAuth endpoints
+
+This architecture enables any OAuth 2.1 compliant client to authenticate users through Google, even from browser environments, without requiring changes to the client implementation.
+
 For detailed OAuth 2.1 setup and client implementation, see [docs/oauth21-setup.md](docs/oauth21-setup.md).
 
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