问题
In robots.txt can I write the following relative URL for the sitemap file?
sitemap: /sitemap.ashx
Or do I have to use the complete (absolute) URL for the sitemap file, like:
sitemap: http://subdomain.domain.com/sitemap.ashx
Why I wonder:
- I own a new blog service, www.domain.com, that allow users to blog on accountname.domain.com.
- I use wildcards, so all subdomains (accounts) point to: "blog.domain.com".
In blog.domain.com I put the robots.txt to let search engines find the sitemap. But, due to the wildcards, all user account share the same robots.txt file.Thats why I can't use the second alternative. And for now I can't use url rewrite for txt files. (I guess that later versions of IIS can handle this?)
回答1:
According to the official documentation on sitemaps.org it needs to be a full URL:
You can specify the location of the Sitemap using a robots.txt file. To do this, simply add the following line including the full URL to the sitemap:
Sitemap: http://www.example.com/sitemap.xml
回答2:
Google crawlers are not smart enough, they can't crawl relative URLs, that's why it's always recommended to use absolute URL's for better crawlability and indexability.
Therefore, you can not use this variation
> sitemap: /sitemap.xml
Recommended syntax is
Sitemap: https://www.yourdomain.com/sitemap.xml
Note:
- Don't forgot to capitalise the first letter in "sitemap"
- Don't forgot to put space after "Sitemap:"
回答3:
Good technical & logical question my dear friend. No in robots.txt file you can't go with relative URL of the sitemap; you need to go with the complete URL of the sitemap.
It's better to go with "sitemap: https://www.example.com/sitemap_index.xml"
In the above URL after the colon gives space. I also like to support Deepak.
来源：https://stackoverflow.com/questions/14196801/can-a-relative-sitemap-url-be-used-in-a-robots-txt