fix: proxy-headers HTTPS redirect, httpx manquant, mcp<2.0.0, migration SSE->StreamableHTTP (30/07/2026)

Dockerfile

@@ -20,4 +20,4 @@ EXPOSE 8000
 RUN mkdir -p /app/data
 
 # Run seed data on startup, then start uvicorn
-CMD ["sh", "-c", "python -m app.seed && uvicorn app.main:app --host 0.0.0.0 --port 8000"]
+CMD ["sh", "-c", "python -m app.seed && uvicorn app.main:app --host 0.0.0.0 --port 8000 --proxy-headers --forwarded-allow-ips=*"]

app/main.py

@@ -1,11 +1,18 @@
 import asyncio
+import contextlib
 from fastapi import FastAPI
 from fastapi.staticfiles import StaticFiles
 from fastapi.middleware.cors import CORSMiddleware
 from app.routes import api, admin, mcp
 from app.models import init_db
 
-app = FastAPI(title="context-hub", version="1.0.0")
+@contextlib.asynccontextmanager
+async def lifespan(app: FastAPI):
+    await init_db()
+    async with mcp.session_manager.run():
+        yield
+
+app = FastAPI(title="context-hub", version="1.0.0", lifespan=lifespan)
 
 app.add_middleware(
     CORSMiddleware,
@@ -21,9 +28,6 @@ app.include_router(api.router)
 app.include_router(admin.router)
 app.include_router(mcp.router)
 
-@app.on_event("startup")
-async def on_startup():
-    await init_db()
 
 @app.get("/health")
 async def health_check():

app/routes/mcp.py

@@ -4,7 +4,10 @@ import contextvars
 from fastapi import APIRouter, Depends, Request, HTTPException
 from fastapi.responses import Response, JSONResponse
 from mcp.server import Server
-from mcp.server.sse import SseServerTransport
+try:
+    from mcp.server.streamable_http_manager import StreamableHTTPSessionManager
+except ImportError:
+    from mcp.server.streamable_http import StreamableHTTPSessionManager
 from mcp.types import Tool, TextContent
 from app.auth import get_current_agent
 from app.scopes import has_scope_access, ALL_SCOPES
@@ -223,16 +226,20 @@ async def handle_call_tool(name: str, arguments: dict) -> list[TextContent]:
 
     return [TextContent(type="text", text=json.dumps({"error": "Unknown tool"}))]
 
-# FastMCP / SSE Integration
-# connect_sse() ET handle_post_message() envoient chacun leur reponse ASGI
-# completement par eux-memes (via le send() qu'on leur passe). Les faire
-# passer par des routes FastAPI classiques (Depends + return Response) fait
-# que FastAPI tente un second envoi une fois le SDK termine -> RuntimeError
-# uvicorn ("Unexpected ASGI message 'http.response.start' sent, after response
-# already completed"). Un seul montage ASGI brut gere GET (ouverture SSE) et
-# POST (messages) sans jamais repasser par le wrapping FastAPI ; l'auth
-# X-API-Key est donc verifiee ici a la main plutot que via Depends.
-sse_transport = SseServerTransport("/messages")
+# Streamable HTTP Integration (mcp SDK v1.x, transport recommande depuis la spec 2025-03-26).
+# Remplace l ancien transport SSE (SseServerTransport) qui exigeait un session_id
+# etabli via un GET prealable -- les clients MCP modernes (Gemini/Antigravity inclus)
+# postent directement le JSON-RPC initialize sans cette poignee de main, d ou les 400
+# Bad Request observes avec l ancienne implementation.
+# L auth X-API-Key reste verifiee a la main avant de deleguer a session_manager.handle_request,
+# meme principe qu avant : current_agent_var est positionne pour la duree de la requete,
+# lu ensuite par les handlers call_tool/list_tools via caller_agent.
+session_manager = StreamableHTTPSessionManager(
+    app=mcp_server,
+    event_store=None,
+    json_response=True,
+    stateless=True,
+)
 
 async def _mcp_asgi_app(scope, receive, send):
     if scope["type"] != "http":
@@ -247,15 +254,10 @@ async def _mcp_asgi_app(scope, receive, send):
         return
     await update_key_last_used(api_key)
 
-    if scope["method"] == "POST":
-        await sse_transport.handle_post_message(scope, receive, send)
-        return
-
-    async with sse_transport.connect_sse(scope, receive, send) as (read_stream, write_stream):
-        token = current_agent_var.set(agent)
-        try:
-            await mcp_server.run(read_stream, write_stream, mcp_server.create_initialization_options())
-        finally:
-            current_agent_var.reset(token)
+    token = current_agent_var.set(agent)
+    try:
+        await session_manager.handle_request(scope, receive, send)
+    finally:
+        current_agent_var.reset(token)
 
 router.mount("/mcp", _mcp_asgi_app)

requirements.txt

@@ -4,6 +4,7 @@ aiosqlite>=0.19.0
 PyJWT>=2.8.0
 jinja2>=3.1.3
 python-multipart>=0.0.9
-mcp>=1.2.0
+mcp>=1.2.0,<2.0.0
 python-dotenv>=1.0.1
 sse-starlette>=1.6.5
+httpx>=0.27.0