A crawler, also known as a spider or a bot, is the software Google uses to process and index the content of webpages. The AdSense crawler visits your site to determine its content in order to provide relevant ads.
Here are some important facts to know about the AdSense crawler:
- The crawler report is updated weekly.
The crawl is performed automatically and we're not able to accommodate requests for more frequent crawling.
- The AdSense crawler is different from the Google crawler.
The two crawlers are separate, but they do share a cache. We do this to avoid both crawlers requesting the same pages, thereby helping publishers conserve their bandwidth. Similarly, the Webmaster Tools crawler is separate.
- Resolving AdSense crawl issues will not resolve issues with the Google crawl.
Resolving the issues listed on your Crawler access page will have no impact on your placement within Google search results. For more information on your site's ranking on Google, review our entry on getting included in Google search results.
- The crawler indexes by URL.
Our crawler will access site.com and www.site.com separately. However, our crawler will not count site.com and site.com/#anchor separately.
- The crawler won't access pages or directories prohibited by a robots.txt file.
Both the Google and AdSense Mediapartners crawlers honor your robots.txt file. In case it prohibits access to certain pages or directories, they will not be crawled.
- The crawler will attempt to access only URLs that request Google ads.
Only pages displaying Google ads should be sending requests to our systems and being crawled.
- The crawler will attempt to access pages that redirect.
When you have "original pages" that redirect to other pages, our crawler must access the original pages to determine that a redirect is in place. Therefore, our crawler's visit to the original pages will appear in your access logs.