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Google, Yahoo, msn/live, ask four English search engine giants recently teamed up to launch a "canonical" label, the purpose is to eliminate the site as much as possible repeat content.
I translate it into "standardization". This tag can help us optimize the contents of the site, enhance the weight and ranking of the website.
Let's look at the meaning and use of this new label.
What is duplicate content?
First, we need to understand what search engines define as duplicate content.
Simply put, different URLs point to the same content and cause duplicate content. The content of repetition is generally divided into three types:
Collect content. Whether you collect the content of someone else's web site or if someone else collects the content of your site, it will produce duplicate content. The collected content is to be punished by the search engine, not in this article discussion scope.
Site content Repeat, this situation is most common in blog class sites. Many blogs are full text output to the home page, you can see the full text of the article page, the content and the homepage is exactly the same. This kind of situation search engine can be recognized normally. The search engine will not punish the site as long as it does not intentionally create many pages of the same content. This duplication of content will cause some interference to the search engine, the specific performance is that some of the blog home page in a number of keywords are ranked, and contains the real content of the article page ranking is not ideal.
Content replication caused by web site programs. Because of the server, Web site CMS and other factors, resulting in multiple URLs to point to the same page. For example, the following URLs may all point to the same page:
www.example.com
example.com
www.example.com/
example.com/
Www.example.com/index.html
Example.com/index.html
Www.example.com/Home.aspx
Example.com/home.aspx
Search engines will not punish this repetitive content, they will choose a URL to index and rank, but perhaps this URL is not the one you want, at the same time, these different variations of the URL will also cause a certain problem visitors.
How do I avoid copying content?
Options available:
With a good website CMS program, control CMS only generates the URL you want.
All stations to do when the link, point to the same page of the strict use of the same URL
REDIRECT URLs that cause duplicate content through 301 to a unique URL
Go to Google website Management Center, set the preferred URL, choose to take www or not with www one of them
Submit an XML URL map to the search engine and put the URLs you want to include in your search engine.
Possible problems
Your program is not good enough, it will produce some duplicate URLs. such as generating www.example.com/catalog/and www.example.com/catalog/index.htm at the same time.
You can control the unity of the links in the station, but the link URLs that other people make to you are often not in your control.
You don't do 301 jumps, or your space doesn't give you permission to do 301.
Case of URL
Different user session IDs are different, but the content is the same
Content is sorted in different ways, such as ordering products in price order or reverse sequence
How to standardize?
Add the following code to the header <head></head> between all of the pages that you think could cause duplicate content:
<link rel= "canonical" Href= "http://www.example.com/page.html"/>
Tell the search engine that the content only corresponds to the URL, and ask the search engine to index only, ranking the URL.
Precautions
This is just a hint, not enforcement. Search engines will decide for themselves whether to use this hint, which is different from 301 redirects.
It is best to try to avoid duplicate content before considering the label. If you are a master, please take this as your last resort.
If you find someone using the tag to cheat, the search engine may take appropriate action.
Common
Q: Can standardization be used across stations?
A: No. The content under a.com cannot be standardized to B.Com.
Q: Can this be used across subdomains?
A: Yes. For example, the content under a.example.com can be standardized to b.example.com.
Q: Can I use HTTP content as a standard for HTTPS content?
A: Of course you can.
Q: What's the difference between this and 301 redirects?
A: They are similar in function. Consider using this when you do not have permission or do not have 301 redirects.
Q: Does the content of standardized pages have to be exactly the same?
Answer: No. They must be at least very similar, and a little difference is possible.
Q: Do I use a relative or an absolute URL?
A: both are available. But we recommend absolute URLs so that you can avoid errors as much as possible.
Q: Do you track standardized multiple chains?
A: Maybe, but I won't believe it. Standardize the page directly to the final page.
Q: If I standardize the Web page to 404 pages, or import it into a dead loop, or a page that stops spiders from crawling?
A: Search engines will try to solve these problems. But please don't do anything out of line.
This article is from the Valley Hundred Excellent: http://www.ouyangchun.com/
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