# API Reference

This page documents the most important classes and methods in VeloFrame.

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## Server
- **`__construct($proj_dir = null)`**: Initialize the server with the project directory.
- **`setRoutingHandler($rh)`**: Attach a routing handler.
- **`getRoutingHandler()`**: Get the current routing handler.
- **`serve()`**: Handle the current request.

## RoutingHandler
- **`register($uri, $handler)`**: Map a URI to a controller.
- **`handle($path)`**: Dispatch a request to the correct controller.

## DefaultPageController / RequestHandler
- Base classes for your controllers. Implement request handling logic here.

## Template
- **`__construct($template_name = null)`**: Load a template by name.
- **`open($template_name)`**: Load a new template.
- **`includeTemplate($name, $template)`**: Insert a sub-template.
- **`setVariable($name, $value)`**: Set a variable for substitution.
- **`setComponent($name, $component)`**: Insert a component.
- **`output($var_default = "")`**: Render the template to HTML.

## TemplateComponent
- **`__construct($component_name, ...$args)`**: Load a component and set variables.
- **`setVars(...$args)`**: Set variables by order.
- **`setVariable($name, $value)`**: Set a variable by name.
- **`output($var_default = "")`**: Render the component to HTML.

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For more, see the source code in `VeloFrame/` or [Architecture](./Architecture.md).