# The Event Handlers

The event handlers that you will produce for remote interaction are exactly the same as your other handlers, with the exception that they have a return type and return data back to the caller; our proxies. Then our proxies can strong type the return data elements:

**Handler:**

```javascript
function getCacheKeys(event,rc,prc){
    return getCache( rc.cacheProvider ).getKeys();
}

function listUsers(event,rc,prc){
    prc.data = userService.list();

    if( event.isProxyRequest() ){
        return prc.data;
    }

    event.setView("users/listUsers");
}
```

> **Hint** The request context has a method called `isProxyRequest()` which tells the application if the request is coming from a ColdBox proxy.

**Proxy:**

```javascript
array function getCachekEys(string cacheProvider='default'){
    arguments.event = "proxy.getCacheKeys";
    return process(argumentCollection=arguments);
}

string function getUsersJSON(){
    arguments.event = "proxy.listUsers";
    return serializeJSON( process(argumentCollection=arguments) );
}
```


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