+* Build the VPC-SC `psc_endpoint` URL as `http://{psc_endpoint}:{port}` in `Sandboxes.send_command` and `ws://{psc_endpoint}:{port}` in `Sandboxes.generate_browser_ws_headers`, instead of `https://{psc_endpoint}` on 443. The sandbox router pod serves plain HTTP on the caller-supplied port (default 8080) and does not terminate TLS on 443, so the prior URLs hung on `ConnectTimeout`. Non-VPC-SC branches are unaffected. ([dd39926](https://github.com/googleapis/python-aiplatform/commit/dd39926783ed403fbce9f2ca7d871295856e3af2))
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