POST /mcp HTTP/1.1"
"Host: localhost:8080"
"User-Agent: my-mcp-client:0.1.0"
"Accept: application/json, text/event-stream"
"Content-Type: application/json"
"Content-Length: 216"

{\"jsonrpc\": \"2.0\",\"id\": 1,\"method\": \"initialize\",\"params\": {\"protocolVersion\": \"2025-03-26\",\"capabilities\": {\"roots\": {\"listChanged\": true},\"sampling\": {}},\"clientInfo\": {\"name\": \"ExampleClient\",\"version\": \"1.0.0\"}}}