Baidu's Jiasule or "Cloud Acceleration" is an online security platform designed to speed up websites and protect them against DDoS attacks. In terms of functionality, it's very similar to CloudFlare although the latter is an American company while Jiasule was developed in-house by Internet giant Baidu (aka. China's "Google"). On October 15, 2013, Jiasule made headlines when they announced that they were going to be accepting Bitcoin. Both sites also use a picture of a cloud as their logo.
Here are the error pages for Jiasule (click to expand):
And here's what the error page for CloudFlare looks like in comparison (click to expand):