Hi,The following text was copied from a website:
- On some searches, Google uses a special tag supported by Firefox and Mozilla to instruct the browser to download the top search result before the user clicks on the result. When the user clicks on the top result, the destination page will load faster than before. This tag is only inserted when it is likely that the user will click on the first link.
For example, when a Firefox user searches for [stanford], Google includes the following tag in the results HTML:
The official Mozilla Link Prefetching FAQ describes the behavior of this tag in detail.
Prefetching may impact your site because the prefetch request will happen whether or not the user clicks on the result, so it may result in additional traffic to your web server. Google only inserts this tag when there is a high likelihood that the user will click on the top result, but clearly this heuristic is not right 100% of the time.
- Can I distinguish prefetch requests from normal requests?
Yes, as described in the Mozilla Link Prefetching FAQ, prefetch requests include the additional HTTP header
X-moz: prefetch
- I want to block/ignore prefetch requests. What should I do?
To block or ignore prefetch requests (from Google and other web sites), you should configure your web server to return a 404 HTTP response code for requests that contain the “X-moz: prefetch” header.
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Now is the question:
Is there any possibility to prevent requests from google? With GetHTTPHeader() i can get the “X-moz: prefetch” but how can i send a 404 HTTP response?