AWS Lambda not reporting URL

Using SDK with Django.

The lambda function traces don't report the URL on the top level segment, looking at the raw data it seems that the URL is being set in the subsegments. Is there any way to call `put_http_meta` on the root Lambda segment through application code?

I tried extending the middleware, grabbing the current segment and setting the http metadata, but this returns the facade segment, which can't be mutated.