> For the complete documentation index, see [llms.txt](https://jmax45.gitbook.io/peerly/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://jmax45.gitbook.io/peerly/controller/what-is-it.md).

# What is it

Due to the stateless nature of UDP there's no standard way to send requests and obtain responses for them. You would have to send a request and then listen for the 'message' event and somehow figure out which message is a response to your request. 

This is why the Controller class was introduced. It allows you to create requests and wait for a response, similar to the standard way of fetching a resource, making the development of your apps a lot easier. 


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