Hmm, I don't know enough to give you a confident answer yet. The information extracts provided do not contain specific details about the 408 HTTP status code error you're encountering with the

connector-builder-api/v1/stream/read

and

api/v1/connector_builder_projects/update

endpoints. However, I can tell you that the 408 HTTP status code typically indicates a request timeout error. This could be due to a variety of reasons such as network issues, server overload, or the server taking too long to process your request. In the context of Airbyte's Connector Builder, there are certain error handling strategies that can be implemented, such as backoff strategies for retrying failed requests. You can learn more about these in the [Error Handling section of the Connector Builder UI documentation](https://docs.airbyte.com/connector-development/connector-builder-ui/error-handling). For more specific assistance, I would recommend reaching out to the Airbyte community on their [Slack channel](https://airbytehq.slack.com) or [discussion forum](https://discuss.airbyte.io).