First thing is that it only supports a post Request with the following params

{
    "val":"any_string"
}

{
    resize:n
}
here n should be an integer

About the implementation there are 3 versions
1.In master is a simple pool which uses sync waitgroup and a very simple worker.

2.In v2 branch is a simple dispatcher model There is a small bug here on closing channels ;(

3.In v3 branch is another implementation of the same pool but with a little more elegant solution.