One way to normalize is to evaluate which URL is best suited for your site when there are multiple URLs. What appears to be the same page to us and everyone else is different to search engines. Search engines don't just search the content on a web page to decide if it is the same web page or not. It also looks at the URL you are using to decide whether to access the same page or a different page.
Therefore, if your homepage is called using multiple formats, then it can confuse search engines. We can make your homepage like below: www.xxx.com xxx.com/xxx.com/home.asp www.xxx.com/index.html For search engines all these pages are unique entities. But when the search is on and your site is listed, Google has already decided which URL is the best to show to your site in the list. Therefore, when it comes to the process of deciding on the best URL for a website, there are multiple options to choose from. Sometimes Google may not move up the exact same URL and we would like to speed that up. This will also dilute the effectiveness of your SEO efforts and your website's PR. Google PR counts web pages, not the entire website. So, if you have multiple selects for the same page, the selector page for each page may be different from the URL you used in your contact activity.
So to avoid this confusion with canonicalized URLs, make sure you use the same URL for all pages accessing this particular page. This applies not only to the web page, but to the rest of the web. Even within your link campaign utilize a single URL so that the link juice doesn't spread and dilute across various pages. Google and other search engines take different considerations into account when using these pages online, and these pages can return different results. You could also send all traffic to a single URL say for example www.xxx.com/ using 301 redirects for all the other URLs listed above. If you use this type of permanent redirect, Google will know that this is your main or typical page in the URL in question. Do not use URL removal tools to get rid of indexing from other URLs. This will result in complete deletion of the domain's index and will take at least 6 months to get your own index restored. Consistency pays over the long run; so track how your website is being called internally as well as externally.