docs: clarify streamable_http_path configuration when mounting servers (#1172)

examples/snippets/servers/streamable_http_multiple_servers.py

@@ -0,0 +1,41 @@
+"""
+Example showing how to mount multiple StreamableHTTP servers with path configuration.
+
+Run from the repository root:
+    uvicorn examples.snippets.servers.streamable_http_multiple_servers:app --reload
+"""
+
+from starlette.applications import Starlette
+from starlette.routing import Mount
+
+from mcp.server.fastmcp import FastMCP
+
+# Create multiple MCP servers
+api_mcp = FastMCP("API Server")
+chat_mcp = FastMCP("Chat Server")
+
+
+@api_mcp.tool()
+def api_status() -> str:
+    """Get API status"""
+    return "API is running"
+
+
+@chat_mcp.tool()
+def send_message(message: str) -> str:
+    """Send a chat message"""
+    return f"Message sent: {message}"
+
+
+# Configure servers to mount at the root of each path
+# This means endpoints will be at /api and /chat instead of /api/mcp and /chat/mcp
+api_mcp.settings.streamable_http_path = "/"
+chat_mcp.settings.streamable_http_path = "/"
+
+# Mount the servers
+app = Starlette(
+    routes=[
+        Mount("/api", app=api_mcp.streamable_http_app()),
+        Mount("/chat", app=chat_mcp.streamable_http_app()),
+    ]
+)