A method for use with a first client device, for use with a first server that comprises a web server that is a Hypertext Transfer Protocol (HTTP) server that responds to HTTP requests, the first server stores a first content identified by a first content identifier, and for use with a second server, the method by the first client device comprising:receiving, from the second server, the first content identifier;sending, to the first server over the Internet, a Hypertext Transfer Protocol (HTTP) request that comprises the first content identifier;receiving, the first content from the first server over the Internet in response to the sending of the first content identifier; andsending, the first content by the first client device to the second server, in response to the receiving of the first content identifier. view more

The method according to claim 1, further comprising storing, operating, or using, a client operating system.

A method for use with a resource associated with a criterion in a client device that communicates with a first server over the Internet, the client device is identified in the Internet using a first identifier and is associated with first and second state according to a utilization of the resource, the method comprising:initiating, by the client device, communication with the first server over the Internet in response to connecting to the Internet, the communication comprises sending, by the client device, the first identifier to the first server over the Internet;when connected to the Internet, periodically or continuously determining whether the resource utilization satisfies the criterion;responsive to the determining that the utilization of the resource satisfies the criterion, shifting to the first state or staying in the first state;responsive to the determining that the utilization of the resource does not satisfy the criterion, shifting to the second state or staying in the second state;responsive to being in the first state, receiving, by the client device, a request from the first server; andperforming a task, by the client device, in response to the receiving of the request from the first server,wherein the method is further configured for fetching over the Internet a first content identified by a first content identifier from a web server that is distinct from the first server, and the task comprising:receiving, by the client device, the first content identifier from the first server;sending, by the client device, the first content identifier to the web server;receiving, by the client device, the first content from the web server in response to the sending of the first content identifier; andsending, by the client device, the received first content to the first server. view more

The method according to claim 9, wherein the client operating system is a mobile operating system.

The method according to claim 15, wherein the mobile device comprises a smartphone.

The method according to claim 19, wherein the resource utilization is based on, or comprises, the processor or CPU time of executing one or more threads or processes, wherein the resource utilization is based on, or comprises, the processor or CPU idling time, or wherein the resource utilization is based on, or comprises, the processor or CPU executing a system idle process. view more

A method for use with a web server that responds to Hypertext Transfer Protocol (HTTP) requests and stores a first content identified by a first content identifier, the method by a first client device comprising:establishing a Transmission Control Protocol (TCP) connection with a second server;sending, to the web server over an Internet, the first content identifier;receiving, the first content from the web server over the Internet in response to the sending of the first content identifier; andsending the received first content, to the second server over the established TCP connection, in response to the receiving of the first content identifier. view more

The method according to claim 1, further comprising storing, operating, or using, a client operating system.