[McpSdk][RFC] Add support for Streamable HTTP transport #166
Description
MCP specification ref: https://modelcontextprotocol.io/specification/2025-06-18/basic/transports#streamable-http
As it's say in specification, "This (Streamable HTTP) replaces the HTTP+SSE transport from protocol version 2024-11-05"
The main difference between those 2 transports is the directionality: SSE is unidirectional (client initiate connection, then server sends data to client), Streamable HTTP is bidrectional (both client and server can send data to each other). In Streamable HTTP, SSE is optional, the server could stream data through SSE to the client.
IDK if this was planned in php-llm. If not, here is the issue as starting point to implement it 🚀