Resource pre-fetch using age threshold

A client device comprising:

• at least one processor;
• and
• memory storing instructions that, when executed by the at least one processor, causes a web browser executing on the client device to perform operations including:
• receiving, from a search system, a set of search results that are responsive to a search query provided by the web browser, each search result including a reference to a webpage, wherein at a search result of the set of search results includes a pre-fetch command that causes the web browser to pre-fetch one or more resources referenced by the webpage referenced by the search result, and wherein each of the one or more resources that are pre-fetched is a resource for which the search system has:
• determined an age of the resource using a timestamp for the resource that indicates a time that the webpage was previously crawled to identify the resource as a component of the webpage, and
• determined that the age of the resource exceeds a threshold age;
• receiving a selection of the search result;
• in response to the selection, requesting the webpage referenced by the search result and concurrently executing the pre-fetch command;
• and
• presenting the webpage at the client device by accessing and presenting data received from the one or more resources in response to executing the pre-fetch command.

A computer-implemented method, comprising:

• receiving, from a search system, a set of search results that are responsive to a search query provided by a client device, each search result including a reference to a webpage, wherein at a search result of the set of search results includes a pre-fetch command that causes a web browser to pre-fetch one or more resources referenced by the webpage referenced by the search result, and wherein each of the one or more resources that are pre-fetched is a resource for which the search system has:
• determined an age of the resource using a timestamp for the resource that indicates a time that the webpage was previously crawled to identify the resource as a component of the webpage, and
• determined that the age of the resource exceeds a threshold age;
• receiving a selection of the search result;
• in response to the selection, requesting, by the web browser, the webpage referenced by the search result and concurrently executing the pre-fetch command;
• and
• presenting the webpage at the client device by accessing and presenting data received from the one or more resources in response to the web browser executing the pre-fetch command.

A computer-implemented method, comprising:

• identifying a set of resources in response to crawling a plurality of webpages, each resource in the set of resources being a component of a webpage in the plurality of webpages, and each webpage in the plurality of webpages using at least one resources in the set of resources to present content;
• for each resource in the set of resources:
• determining an age of the resource using a timestamp for the resource that indicates a time that the resource was identified as a component of a webpage of the plurality of webpages in a previous crawl, and
• determining that the age of the resource exceeds a threshold age;
• and
• for each respective resource that is determined to have an age that exceeds the threshold age, generating an index entry in a pre-fetch index for the respective resource.