To reduce costs, some websites steal links from other websites to enrich their own contents. Stealing links not only damages interests of the original websites but also increases workloads on the original websites' servers. URL validation resolves this problem.
In HTTP, a website can detect the web page that accesses a target web page using the Referrers field. As the Referrers field can trace sources, specific techniques can be used to block or return to specific web pages if the pages are not from the website. URL validation checks whether the Referrers field in requests matches the whitelist or blacklist by setting Referrers. If the field matches the whitelist, the requests are allowed. Otherwise, the requests are blocked or specific pages are displayed.
OBS supports URL validation based on Referrers in HTTP headers to prevent a user's data on OBS from being stolen by other users.