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Content Delivery Networks are the only practical solution to reduce the overwhelming condition of the server's load due to the excessive traffic due to client's request. This paper focus to provide Request Routing so that the selection of server for serving the request becomes more easy and efficient without a wastage in the resources consumed. The request redirector performs the request routing based on certain policies. In order to provide an efficient request routing in content delivery network, there are certain parameters introduced like memory utilization, bandwidth utilization, cpu utilization and connection availability. These parameters are considered each time a request arrives. PSO algorithm is used to evaluate these searching parameters in the searching space. It finds the value of parameters for each server and the generated value is compared with each other. The server with less optimized value will be selected for processing the request. Thus request routing will be done based on this result. By considering all the parameters in the searching space with pso algorithm ,proposed request routing mechanism becomes more efficient.