system/classes/Route.php
public function routeProcess($uri = false, $httpMethod = false)
    {
        // Set Request type.
        if (!$httpMethod) $httpMethod = $_SERVER['REQUEST_METHOD'];
        $this->httpMethod = $httpMethod;

        // Set PATH info.
        if (!$uri) $uri = $_SERVER['REQUEST_URI'];
        $this->setPath($uri);

        // BIG IDEA: routeFind() must be called to populate needed Controller and Method variables. 
        //
        // If a custom route is found, routeFind() still needs to be called to populate 
        // data member variables and complete the mapping from URI to a Controller file.
        //
        // If custom route is not set, but automatic routing is enabled, also call routeFind
        // to see if an automatic route exists.
        $customPathSearch = $this->customFind();
        if ($customPathSearch || (!$customPathSearch && $this->config['automatic_routing'])) {
            $this->routeFind();
        } 

        // If a route was found, but access was denied via the preExec callback...
        else if ($customPathSearch == -1) {
            $this->error('403');
        }

        // ELSE
        // Do nothing if there's no match. When and if routeExec is called user will be 
        // directed to 404. But until then, developers can use the exists() method to 
        // check different routes and possibly redirect the user somewhere else.
    }
public function routeProcess($uri = false, $httpMethod = false)
    {
        // Set Request type.
        if (!$httpMethod) $httpMethod = $_SERVER['REQUEST_METHOD'];
        $this->httpMethod = $httpMethod;

        // Set PATH info.
        if (!$uri) $uri = $_SERVER['REQUEST_URI'];
        $this->setPath($uri);

        // BIG IDEA: routeFind() must be called to populate needed Controller and Method variables. 
        //
        // If a custom route is found, routeFind() still needs to be called to populate 
        // data member variables and complete the mapping from URI to a Controller file.
        //
        // If custom route is not set, but automatic routing is enabled, also call routeFind
        // to see if an automatic route exists.
        $customPathSearch = $this->customFind();
        if ($customPathSearch || (!$customPathSearch && $this->config['automatic_routing'])) {
            $this->routeFind();
        } 

        // If a route was found, but access was denied via the preExec callback...
        else if ($customPathSearch == -1) {
            $this->error('403');
        }

        // ELSE
        // Do nothing if there's no match. When and if routeExec is called user will be 
        // directed to 404. But until then, developers can use the exists() method to 
        // check different routes and possibly redirect the user somewhere else.
    }
Checks if a custom or default route exists for a URL and HTTP method.
By default will grab URL and HTTP method from server variables,
but can be passed in as arguments.