Issue pinecone-io#284 Add CORS support to handle preflight OPTIONS re…

…quests

This commit addresses the CORS issue reported in Issue pinecone-io#284, where the API failed to handle preflight OPTIONS requests, causing failures in direct client-to-API communications from browsers. The FastAPI application now includes CORSMiddleware, allowing proper handling of CORS preflight checks and enabling browser-based clients to directly interface with the Canopy API.

Changes:
- Added CORSMiddleware to the FastAPI application setup.
- Configured the middleware to allow all origins, methods, and headers, facilitating cross-origin requests.

This update ensures better accessibility and integration capabilities of the Canopy API for various client applications, especially those running in browser environments.

src/canopy_server/app.py

@@ -23,6 +23,10 @@
     Body,
     APIRouter
 )
+
+from fastapi.middleware.cors import (
+    CORSMiddleware
+)
 import uvicorn
 from typing import cast, Union, Optional
 
@@ -89,6 +93,15 @@ async def lifespan(app: FastAPI):
     },
     lifespan=lifespan
 )
+
+app.add_middleware(
+    CORSMiddleware,
+    allow_origins=["*"],  # Allows all origins
+    allow_credentials=True,
+    allow_methods=["*"],  # Allows all methods
+    allow_headers=["*"],  # Allows all headers
+)
+
 openai_api_router = APIRouter()
 context_api_router = APIRouter(prefix="/context")
 application_router = APIRouter(tags=["Application"])