Today I checked the keyword 长ping in google, my page ranks number one, so amazing! But I click the page, it’s a 404 page. It suddenly occured to me that I had changed all of my URLs! So Google has not indexed my new URLs yet. It’s so weird that the top one search result is a blank page without any tip guides the users back to home page. This article recorded how to customize the 404 page and guide the users back to home page.