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fix(qr-server): use stable mcp SDK from PyPI (#360)

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* fix(qr-server): use stable mcp SDK from PyPI

- Replace git-based mcp dependency with mcp>=1.26.0 from PyPI for stability
- Remove TransportSecuritySettings that was blocking browser connections
- Keep simple FastMCP initialization like other Python examples

Fixes ModuleNotFoundError and 403 Forbidden errors when connecting from basic-host

* fix(qr-server): use stable mcp SDK from PyPI

- Replace git-based mcp dependency with mcp>=1.26.0 from PyPI
- Add stateless_http=True for proper HTTP transport handling
- Remove TransportSecuritySettings that blocked browser connections
This commit is contained in:
Maurizio Albari 2026-01-26 19:52:10 +01:00 • committed by GitHub
commit f9abb74fc0
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1 changed files with 3 additions and 8 deletions
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11
examples/qr-server/server.py
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@ -2,7 +2,7 @@
# /// script # /// script
# requires-python = ">=3.10" # requires-python = ">=3.10"
# dependencies = [ # dependencies = [
# "mcp @ git+https://github.com/modelcontextprotocol/python-sdk@main", # "mcp>=1.26.0",
# "qrcode[pil]>=8.0", # "qrcode[pil]>=8.0",
# "uvicorn>=0.34.0", # "uvicorn>=0.34.0",
# "starlette>=0.46.0", # "starlette>=0.46.0",
@ -19,7 +19,6 @@ import base64
import qrcode import qrcode
import uvicorn import uvicorn
from mcp.server.fastmcp import FastMCP from mcp.server.fastmcp import FastMCP
from mcp.server.transport_security import TransportSecuritySettings
from mcp import types from mcp import types
from starlette.middleware.cors import CORSMiddleware from starlette.middleware.cors import CORSMiddleware
@ -27,7 +26,7 @@ VIEW_URI = "ui://qr-server/view.html"
HOST = os.environ.get("HOST", "0.0.0.0") # 0.0.0.0 for Docker compatibility HOST = os.environ.get("HOST", "0.0.0.0") # 0.0.0.0 for Docker compatibility
PORT = int(os.environ.get("PORT", "3001")) PORT = int(os.environ.get("PORT", "3001"))
mcp = FastMCP("QR Code Server") mcp = FastMCP("QR Code Server", stateless_http=True)
# Embedded View HTML for self-contained usage (uv run <url> or unbundled) # Embedded View HTML for self-contained usage (uv run <url> or unbundled)
EMBEDDED_VIEW_HTML = """<!DOCTYPE html> EMBEDDED_VIEW_HTML = """<!DOCTYPE html>
@ -162,11 +161,7 @@ if __name__ == "__main__":
mcp.run(transport="stdio") mcp.run(transport="stdio")
else: else:
# HTTP mode for basic-host (default) - with CORS # HTTP mode for basic-host (default) - with CORS
# Allow Docker bridge IP for container-to-host communication app = mcp.streamable_http_app()
security = TransportSecuritySettings(
allowed_hosts=["127.0.0.1:*", "localhost:*", "[::1]:*", "172.17.0.1:*"]
)
app = mcp.streamable_http_app(stateless_http=True, transport_security=security)
app.add_middleware( app.add_middleware(
CORSMiddleware, CORSMiddleware,
allow_origins=["*"], allow_origins=["*"],