One of our customer was interested in performing a basic HTTP file transfer function using Flux APIs. I implemented a trivial HTTP file transfer Action in Flux plugins project. Here is a sample test case that shows how this action could be integrated within a Flux workflow.
Maven users could just drop this dependency in your POM to use this plugin in your project.
Make sure you include this maven repository where the plugin snapshots are deployed.
There are few more interesting plugins available, you can check the project wiki for more details. Enjoy!