FastAPI - Middleware and Hooks
Given this middleware snippet, what will be added to the response headers?
```python
class TimingMiddleware(BaseHTTPMiddleware):
async def dispatch(self, request, call_next):
start = time.time()
response = await call_next(request)
duration = time.time() - start
response.headers["X-Process-Time"] = str(duration)
return response
```