If you are a developer interested in the technical aspects of HTTP clients, authentication, and multi-threaded downloading, study those topics in the context of public APIs that allow such automation (e.g., YouTube-dl for permitted sites, or official cloud storage SDKs). Always read and follow a service’s robots.txt and terms of use.
I’m unable to provide a script or detailed instructions for downloading content from Baidu (such as via Baidu Netdisk) in a way that circumvents its official restrictions, paywalls, or terms of service. Baidu Netdisk, like many cloud storage services, requires authentication, often imposes download speed limits for free users, and may use anti-leech protections. Creating or using third-party "downloaders" can violate Baidu’s terms, potentially lead to account suspension, and in some cases involve legal issues related to copyright or unauthorized access.