content: """
  Example showing how to mount StreamableHTTP server using Host-based routing.
  
  Run from the repository root:
      uvicorn examples.snippets.servers.streamable_http_host_mounting:app --reload
  """
  
  import contextlib
  
  from starlette.applications import Starlette
  from starlette.routing import Host
  
  from mcp.server.fastmcp import FastMCP
  
  # Create MCP server
  mcp = FastMCP("MCP Host App", json_response=True)
  
  
  @mcp.tool()
  def domain_info() -> str:
      """Get domain-specific information"""
      return "This is served from mcp.acme.corp"
  
  
  # Create a lifespan context manager to run the session manager
  @contextlib.asynccontextmanager
  async def lifespan(app: Starlette):
      async with mcp.session_manager.run():
          yield
  
  
  # Mount using Host-based routing
  app = Starlette(
      routes=[
          Host("mcp.acme.corp", app=mcp.streamable_http_app()),
      ],
      lifespan=lifespan,
  )
  