the present invention is a process , system and apparatus for client - assisted diagnosis and self - healing in a server farm . specifically , in accordance with the inventive arrangements , individual client computing devices can request services , including data , from one or more servers in a server farm . for each request received from an individual client computing device , a network dispatching process , for instance a sprayer , can route the request to an available server in the server farm with which the requesting client and assigned server can establish a communicative session . in those circumstances where an assigned server fails to respond to a requesting client in the course of a communicative session , the requesting client can retry the request along with an indication that the assigned server has failed to respond to a request . the indication can include , for example , a direct reference to the failed server , or a correlator from which the network dispatcher can resolve the identity of the failed server . the network dispatching process , upon receiving the retry , can again route the request to another server in the server farm . additionally , the network dispatching process can undertake remedial action in the failing server , for example recycling the server , restarting a particular application or process in the server , and notifying the server farm administrator . in this way , client computing devices which interact with servers in the server farm can monitor the responsiveness of the servers in the server farm with a degree of granularity not previously possible using diagnostic tools implemented within the network dispatcher . that is to say , while the network dispatcher alone can only monitor the success of a communicative session at the time of the routing the initial request to a particular server in the sever farm , in the present invention , the success of a communicative session can be monitored during the course of each request between a communicatively coupled client and server . thus , the use of the present invention can facilitate an autonomic computing configuration in the server farm . [ 0026 ] fig1 is a block diagram of a server farm which has been configured for client - assisted diagnosis and self - healing in accordance with the inventive arrangements . the server farm 120 can include one or more servers 150 , each server 150 hosting one more computing processes 170 and associated data 180 . a network dispatcher 140 can be configured to receive incoming requests from one or more clients 110 over the computer communications network 130 . the network dispatcher 140 can route such incoming requests to selected ones of the servers 150 according to well - known load - balancing algorithms such as round - robin , or random server selection . optionally , an administrative node 160 can be provided through which the configuration of the server farm 120 can be managed . in operation , a communicative session can be established between an individual client 110 and a server 150 in the server farm 120 . specifically , upon receiving an initial request from the individual client 110 , the network dispatcher , for example a front - end ip sprayer , a resource director or other such network device , can route an initial request to a selected one of the servers 150 in the server farm 120 according to any load - balancing or other server selection algorithm , such as a random selection , a least recently used , or a round robin selection . based upon the assignment of the selected one of the servers 150 , a communicative session can be established between the client 110 and the selected one of the servers 150 during which course session affinity can be maintained between client 110 and the selected one of the servers 150 . in the course of the communicative coupling of client 110 and the selected one of the servers 150 , request / response transactions can occur . ordinarily , where the selected one of the servers 150 can respond to requests from the client 110 in a suitable fashion , session affinity can be maintained . however , where the selected one of the servers 150 fails to respond to a request 190 a , even where the failure occurs during an initial request to establish a session , the client 110 can attempt a retry 190 b . significantly , along with the retry request 190 b , the client 110 can identify the selected one of the servers 150 as having failed to respond to the request 190 a . specifically , the identity of the selected one of the servers 150 can be included , for example as a cookie or within the retry request string . in any case , upon detecting the retry request 190 b , the network dispatcher 140 can assign a new one of the servers 150 to respond to the retry request 190 b . more importantly , the new one of the servers 150 can undertake remedial measures in the selected one of the servers 150 . alternatively , an optionally affiliated doctor process 195 , whether located in the same node as the network dispatcher 140 , or within another node , can undertake remedial measures . such remedial measures can include , for instance , the recycling of the selected one of the servers 150 , the restarting of a particular application or process in the selected one of the servers 150 , and the notification of the administrative node 160 . importantly , the invention neither is limited strictly to the reporting of the response failure at the outset of any one time - out condition , nor is the invention limited strictly to the determination that a failure has occurred exclusively by virtue of a time - out condition in a server . rather , in respect to when a failure in a server is identified , the requesting client can re - attempt the subject request multiple times before determining that a failure has occurred . moreover , the client can declare that a failure has occurred through the inspection of a defective response which otherwise can indicate a failure in the server , for instance , an http 4xx notification . more specifically , the network dispatcher 140 can handle multiple classes of server failure . for example , the network dispatcher 140 can handle the circumstance where the request 190 a sent by the client 110 does not reach the assigned server 150 . also , the network dispatcher 140 can handle the circumstance where the assigned server 150 fails to produce a result . the network dispatcher 140 further can handle the circumstance where the result , while produced by the assigned server 150 , does not reach the client 110 . in all cases , it will be apparent to one skilled in the art that the network dispatcher 140 can handle all failure states arising from the failure to complete a request / response transaction between the client 110 and an assigned server 150 . [ 0032 ] fig2 is a timing diagram illustrating a process for client - assisted diagnosis and self - healing in a server farm . beginning in step 1 , the client can forward a request to a sprayer . the sprayer can route the request in step 2 to an initially assigned server in the server farm . to the extent that the initially assigned server either fails to respond after one or more attempts , or where the server responds with an error notice , or where a failure can be detected from the response , in step 3 , the client can attempt a retry which can include an indication that the initially assigned server has failed to respond to the request . in step 4 , the sprayer or optionally , a doctor process , recognizing a need to assign a new server in the server farm to handle the requests of the client , can assign a next server in the server farm to handle subsequent requests from the client , including the retry request . notably , the next server can be assigned according to any resource management or load balancing algorithm , such as round - robin , random or least recently used . in any case , in step 5 , having identified a failure in the initially assigned server , the sprayer , or doctor as the case may be , can further diagnose the status of the initially assigned server . importantly , the sprayer or doctor process can identify different classes of server failure using several methods , each whose use can depend upon the class of error . for example , where the server has failed to respond to a request , or where the response has not been received by the client , traditional ip tools such as ping and traceroute can be used to diagnose the server failure . by comparison , where the server has received the request , but has not produced a result , the doctor can inject diagnosis transactions into the suspect server , or the doctor can request that the client inject diagnosis transactions into the suspect server . subsequently , the doctor can monitor the result . in the circumstance where the sprayer or the optional doctor process can definitively identify a failure , the sprayer can undertake remedial measures , such as recycling the initially assigned server , or restarting an application or process in the initially assigned server . also , the sprayer can notify the administrator of the server farm of the detected failure . finally , in step 6 , presuming that the next server has not failed , the next server in the server farm can respond to the retry request of the client and subsequent requests issued by the client . the present invention can be realized in hardware , software , or a combination of hardware and software . an implementation of the method and system of the present invention can be realized in a centralized fashion in one computer system , or in a distributed fashion where different elements are spread across several interconnected computer systems . any kind of computer system , or other apparatus adapted for carrying out the methods described herein , is suited to perform the functions described herein . a typical combination of hardware and software could be a general purpose computer system with a computer program that , when being loaded and executed , controls the computer system such that it carries out the methods described herein . the present invention can also be embedded in a computer program product , which comprises all the features enabling the implementation of the methods described herein , and which , when loaded in a computer system is able to carry out these methods . computer program or application in the present context means any expression , in any language , code or notation , of a set of instructions intended to cause a system having an information processing capability to perform a particular function either directly or after either or both of the following a ) conversion to another language , code or notation ; b ) reproduction in a different material form . significantly , this invention can be embodied in other specific forms without departing from the spirit or essential attributes thereof , and accordingly , reference should be had to the following claims , rather than to the foregoing specification , as indicating the scope of the invention .