fix: Fix Sandboxes.send_command failing to reach the sandbox data plane. - #7140
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`Sandboxes.send_command` built an inner `genai.Client(vertexai=True, ...)` and called `_api_client.request(...)` to talk to the sandbox data plane. That genai client's authorized session has no credentials object, so every call failed with `AttributeError: 'NoneType' object has no attribute 'before_request'`, making all Computer Use / sandbox HTTP calls (GET /, /tabs, POST /cdp, etc.) unusable. The sandbox data plane does not use ADC; it authenticates via the `Authorization: Bearer <jwt>`, `X-Sandbox-Routing-Token` and `X-Sandbox-Port` headers that `send_command` already sets. Routing through a genai client was therefore both unnecessary and broken. Issue the request directly with `requests` instead, mirroring `generate_access_token`, which already talks to a non-aiplatform endpoint the same way. A JSON `Content-Type` is set only when a request body is present, and a caller-supplied `Content-Type` is preserved. `generate_browser_ws_headers`, which calls `send_command` internally, continues to parse the JSON body correctly. PiperOrigin-RevId: 979899791
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fix: Fix Sandboxes.send_command failing to reach the sandbox data plane.
Sandboxes.send_commandbuilt an innergenai.Client(vertexai=True, ...)andcalled
_api_client.request(...)to talk to the sandbox data plane. That genaiclient's authorized session has no credentials object, so every call failed with
AttributeError: 'NoneType' object has no attribute 'before_request', making allComputer Use / sandbox HTTP calls (GET /, /tabs, POST /cdp, etc.) unusable.
The sandbox data plane does not use ADC; it authenticates via the
Authorization: Bearer <jwt>,X-Sandbox-Routing-TokenandX-Sandbox-Portheaders that
send_commandalready sets. Routing through a genai client wastherefore both unnecessary and broken.
Issue the request directly with
requestsinstead, mirroringgenerate_access_token, which already talks to a non-aiplatform endpoint thesame way. A JSON
Content-Typeis set only when a request body is present, and acaller-supplied
Content-Typeis preserved.generate_browser_ws_headers,which calls
send_commandinternally, continues to parse the JSON bodycorrectly.