Fix CORS for GitHub Pages and improve multipart request handling

app.py

@@ -281,13 +281,23 @@ async def http_exception_handler(request: Request, exc: StarletteHTTPException):
         content={"detail": exc.detail}
     )
 
+allowed_origins = [
+    "https://harshithreddy01.github.io",
+    "https://harshithreddy01.github.io/frontend-SRMA-Liver",
+    "http://localhost:5173",
+    "http://localhost:3000",
+    "http://localhost:8080",
+]
+
 api_app.add_middleware(
     CORSMiddleware,
-    allow_origins=["*"],
+    allow_origins=allowed_origins,
     allow_credentials=True,
-    allow_methods=["*"],
+    allow_methods=["GET", "POST", "OPTIONS", "HEAD"],
     allow_headers=["*"],
+    expose_headers=["*"],
 )
+print(f"✓ CORS configured for origins: {allowed_origins}")
 
 @api_app.get("/")
 @api_app.get("/api")
@@ -344,14 +354,17 @@ async def download_mask(token: str):
 @api_app.post("/segment", response_class=JSONResponse, include_in_schema=True)
 @api_app.post("/api/segment", response_class=JSONResponse, include_in_schema=True)
 async def segment_liver(
+    request: Request,
     file: UploadFile = File(..., description="NIfTI file to segment"),
     modality: str = Form("T1", description="MRI modality: T1 or T2"),
     slice_idx: Optional[int] = Form(None, description="Optional slice index")
 ):
     print("=" * 60)
     print(f"API REQUEST RECEIVED: /api/segment")
+    print(f"  Origin: {request.headers.get('origin', 'N/A')}")
+    print(f"  Content-Type: {request.headers.get('content-type', 'N/A')}")
     print(f"  File: {file.filename if file else 'None'}")
-    print(f"  Content-Type: {file.content_type if file else 'None'}")
+    print(f"  File Content-Type: {file.content_type if file else 'None'}")
     print(f"  Modality: {modality}")
     print(f"  Slice Index: {slice_idx}")
     print("=" * 60)