return response back from process model

Question

HI All, 
 
 here is the requirement: 
 
 we need to create a REST service which receives some input parameters and based on input parameters response need to return. But, here response is given by a user not any rule or query entity. This service will be used from external source. So whenever external source will hit the service it will expect some response. 
 
 I created a process model for this and assigned task to user for the response. In the web api i started this process model by using a!startprocess . web api only initiate the process model but not wait for completion as its(a!startprocess) property but i need response back from user . 
 How can i do this? any suggestion would be appreciated. 
 
 Thanks in advance. 
 
 Regards 
 Abhay

sergeiz · Answer

If the user involved you can't have it as one call to your REST service because the response can be ready at unknown time. So you need to first have a call that initiates process and it should assign some id and return it to the user. 
 
To get the result you have two options: one is the client should pull your service periodically until it is ready or provide a callback method that your process will call when user done with his task.

return response back from process model

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