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Fix errors when mounting to non-root directories. #569

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Fix errors when mounting to non-root directories. #569

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5 changes: 4 additions & 1 deletion README.md
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Original file line number Diff line number Diff line change
Expand Up @@ -372,10 +372,13 @@ from mcp.server.fastmcp import FastMCP

mcp = FastMCP("My App")

# Customize a mount path
mcp_mount_path = '/mcp'

# Mount the SSE server to the existing ASGI server
app = Starlette(
routes=[
Mount('/', app=mcp.sse_app()),
Mount(mcp_mount_path, app=mcp.sse_app(mcp_mount_path=mcp_mount_path)),
]
)

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4 changes: 2 additions & 2 deletions src/mcp/server/fastmcp/server.py
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Expand Up @@ -477,9 +477,9 @@ async def run_sse_async(self) -> None:
server = uvicorn.Server(config)
await server.serve()

def sse_app(self) -> Starlette:
def sse_app(self, mcp_mount_path: str = '') -> Starlette:
"""Return an instance of the SSE server app."""
sse = SseServerTransport(self.settings.message_path)
sse = SseServerTransport(mcp_mount_path + self.settings.message_path)

async def handle_sse(request: Request) -> None:
async with sse.connect_sse(
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