RDCIST-3853: Add support to private gateway

examples/clients/simple-private-gateway/README.md

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+# Simple Private Gateway Example
+
+A demonstration of how to use the MCP Python SDK as a private gateway with optional API key authentication over streamable HTTP or SSE transport with custom extensions for private gateway connectivity (SNI hostname support).
+
+## Features
+
+- Optional API Key authentication (Bearer token or custom header)
+- Supports both StreamableHTTP and SSE transports
+- Custom extensions for private gateway (SNI hostname) - **Both transports**
+- Can combine authentication + extensions (for authenticated private gateway)
+- Interactive command-line interface
+- Tool calling
+
+## Installation
+
+```bash
+cd examples/clients/simple-private-gateway
+uv sync --reinstall 
+```
+
+## Usage
+
+### 1. Start an MCP server
+
+You can use any MCP server. For example:
+
+```bash
+# Example without authentication - StreamableHTTP transport
+cd examples/servers/simple-tool
+uv run mcp-simple-tool --transport streamable-http --port 8081
+
+# Or with SSE transport
+cd examples/servers/simple-tool
+uv run mcp-simple-tool --transport sse --port 8081
+```
+
+### 2. Run the client
+
+The client will interactively prompt you for:
+
+- Server URL (or press Enter to configure port/protocol/hostname separately)
+  - If you provide a full URL, it will be used directly
+  - If you press Enter, you'll be prompted for: port, protocol, and hostname (for SNI)
+- Transport type (streamable-http or sse)
+- Authentication type (none or API Key)
+- For API Key: API key value, header name, and format (Bearer or direct)
+
+```bash
+# Run the client interactively
+uv run mcp-simple-private-gateway
+```
+
+Follow the prompts to configure your connection.
+
+### 3. Use the interactive interface
+
+The client provides several commands:
+
+- `list` - List available tools
+- `call <tool_name> [args]` - Call a tool with optional JSON arguments  
+- `quit` - Exit
+
+## Examples
+
+### Example 1: Private Gateway without Authentication (StreamableHTTP)
+
+```markdown
+🚀 Simple Private Gateway
+
+📝 Server Configuration
+==================================================
+Server URL [https://localhost:8081]: 
+Server port [8081]: 8081
+Protocol [https]: https
+Server hostname [mcp.deepwiki.com]: mcp.deepwiki.com
+
+Transport type:
+  1. streamable-http (default)
+  2. sse
+Select transport [1]: 1
+
+Authentication:
+  1. No authentication (default)
+  2. API Key authentication
+Select authentication [1]: 1
+==================================================
+
+🔗 Connecting to: https://localhost:8081/mcp
+📡 Server hostname: mcp.deepwiki.com
+🚀 Transport type: streamable-http
+🔐 Authentication: None
+
+📡 Opening StreamableHTTP transport connection with extensions...
+🤝 Initializing MCP session...
+⚡ Starting session initialization...
+✨ Session initialization complete!
+
+✅ Connected to MCP server at https://localhost:8081/mcp
+Session ID: abc123...
+
+🎯 Interactive MCP Client (Private Gateway)
+Commands:
+  list - List available tools
+  call <tool_name> [args] - Call a tool
+  quit - Exit the client
+
+mcp> list
+📋 Available tools:
+1. echo
+   Description: Echo back the input text
+
+mcp> call echo {"text": "Hello, world!"}
+🔧 Tool 'echo' result:
+Hello, world!
+
+mcp> quit
+👋 Goodbye!
+```
+
+### Example 2: SSE Transport without Authentication
+
+```markdown
+🚀 Simple Private Gateway
+
+📝 Server Configuration
+==================================================
+Server URL [https://localhost:8081]: 
+Server port [8081]: 8081
+Protocol [https]: https
+Server hostname [mcp.deepwiki.com]: mcp.deepwiki.com
+
+Transport type:
+  1. streamable-http (default)
+  2. sse
+Select transport [1]: 2
+
+Authentication:
+  1. No authentication (default)
+  2. API Key authentication
+Select authentication [1]: 1
+==================================================
+
+🔗 Connecting to: https://localhost:8081/sse
+📡 Server hostname: mcp.deepwiki.com
+🚀 Transport type: sse
+🔐 Authentication: None
+
+📡 Opening SSE transport connection with extensions...
+🤝 Initializing MCP session...
+⚡ Starting session initialization...
+✨ Session initialization complete!
+
+✅ Connected to MCP server at https://localhost:8081/sse
+
+🎯 Interactive MCP Client (Private Gateway)
+Commands:
+  list - List available tools
+  call <tool_name> [args] - Call a tool
+  quit - Exit the client
+
+mcp> list
+📋 Available tools:
+1. echo
+   Description: Echo back the input text
+
+mcp> quit
+👋 Goodbye!
+```
+
+### Example 3: API Key Authentication with Bearer Token (StreamableHTTP)
+
+```markdown
+🚀 Simple Private Gateway
+
+📝 Server Configuration
+==================================================
+Server URL [https://localhost:8081]: 
+Server port [8081]: 8081
+Protocol [https]: https
+Server hostname [mcp.deepwiki.com]: api.mcp.example.com
+
+Transport type:
+  1. streamable-http (default)
+  2. sse
+Select transport [1]: 1
+
+Authentication:
+  1. No authentication (default)
+  2. API Key authentication
+Select authentication [1]: 2
+Enter API key: sk-1234567890abcdef
+
+API Key format:
+  1. Bearer token (Authorization: Bearer <key>) - default
+  2. Custom header with key only
+Select format [1]: 1
+==================================================
+
+🔗 Connecting to: https://localhost:8081/mcp
+📡 Server hostname: api.mcp.example.com
+🚀 Transport type: streamable-http
+🔐 Authentication: API Key
+🔑 Header: Authorization
+🎯 Format: Bearer token
+
+🔑 Setting up API key authentication (header: Authorization)...
+📡 Opening StreamableHTTP transport connection with extensions and apikey auth...
+🤝 Initializing MCP session...
+⚡ Starting session initialization...
+✨ Session initialization complete!
+
+✅ Connected to MCP server at https://localhost:8081/mcp
+Session ID: key123...
+
+🎯 Interactive MCP Client (Private Gateway with APIKEY)
+Commands:
+  list - List available tools
+  call <tool_name> [args] - Call a tool
+  quit - Exit the client
+
+mcp> list
+📋 Available tools:
+1. secure-data
+   Description: Access secure data with API key
+
+mcp> quit
+👋 Goodbye!
+```
+
+### Example 4: API Key Authentication with Custom Header (SSE)
+
+```markdown
+🚀 Simple Private Gateway
+
+📝 Server Configuration
+==================================================
+Server URL [https://localhost:8081]: 
+Server port [8081]: 8082
+Protocol [https]: https
+Server hostname [mcp.deepwiki.com]: custom.mcp.example.com
+
+Transport type:
+  1. streamable-http (default)
+  2. sse
+Select transport [1]: 2
+
+Authentication:
+  1. No authentication (default)
+  2. API Key authentication
+Select authentication [1]: 2
+Enter API key: my-secret-api-key-123
+
+API Key format:
+  1. Bearer token (Authorization: Bearer <key>) - default
+  2. Custom header with key only
+Select format [1]: 2
+Enter header name [X-API-Key]: X-API-Key
+==================================================
+
+🔗 Connecting to: https://localhost:8082/sse
+📡 Server hostname: custom.mcp.example.com
+🚀 Transport type: sse
+🔐 Authentication: API Key
+🔑 Header: X-API-Key
+🎯 Format: Direct key
+
+🔑 Setting up API key authentication (header: X-API-Key)...
+📡 Opening SSE transport connection with extensions and apikey auth...
+🤝 Initializing MCP session...
+⚡ Starting session initialization...
+✨ Session initialization complete!
+
+✅ Connected to MCP server at https://localhost:8082/sse
+
+🎯 Interactive MCP Client (Private Gateway with APIKEY)
+Commands:
+  list - List available tools
+  call <tool_name> [args] - Call a tool
+  quit - Exit the client
+
+mcp> list
+📋 Available tools:
+1. api-tool
+   Description: Tool requiring custom API key header
+
+mcp> quit
+👋 Goodbye!
+```
+
+## Configuration
+
+The client uses interactive prompts for configuration. You'll be asked to provide:
+
+- **Server URL**: The full URL of your MCP server (default: <https://localhost:8081>1>)
+  - If you provide a URL, it will be used directly
+  - If you press Enter (empty), you'll be prompted for individual components:
+    - **Server port**: The port where your MCP server is running (default: 8081)
+    - **Protocol**: The protocol to use (default: https)
+    - **Server hostname**: The hostname for SNI (Server Name Indication) used in private gateway setup (default: mcp.deepwiki.com)
+- **Transport type**: Choose between `streamable-http` or `sse` (default: streamable-http)
+  - StreamableHTTP servers typically use `/mcp` endpoint
+  - SSE servers typically use `/sse` endpoint
+- **Authentication**: Choose authentication method (default: no authentication)
+  - **None**: No authentication
+  - **API Key**: API key-based authentication
+    - **API Key**: Your API key value
+    - **Format**: Bearer token (Authorization: Bearer <key>) or custom header
+    - **Header name**: Custom header name if not using Bearer format (default: X-API-Key)
+
+## Use Cases
+
+This client supports multiple scenarios:
+
+1. **Private Gateway without Auth**: Use custom SNI hostname for HTTPS private gateway connectivity
+2. **Private Gateway with API Key**: Use API key authentication (Bearer or custom header) with private gateway
+3. **Both Transports**: Works with both StreamableHTTP and SSE transports in all scenarios

examples/clients/simple-private-gateway/mcp_simple_private_gateway/__init__.py

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+"""Simple MCP streamable private gateway client example without authentication."""