src/Web/RequestHelper.php
public function setServerParam($name, $value = null) {
        $this->getServerParams();
        if ($value === null) {
            Reaction\Helpers\ArrayHelper::remove($this->_serverParams, $name);
            unset($this->_serverParams[$name]);
        } else {
            Reaction\Helpers\ArrayHelper::setValue($this->_serverParams, $name, $value);
        }
    }
public function setServerParam($name, $value = null) {
        $this->getServerParams();
        if ($value === null) {
            Reaction\Helpers\ArrayHelper::remove($this->_serverParams, $name);
            unset($this->_serverParams[$name]);
        } else {
            Reaction\Helpers\ArrayHelper::setValue($this->_serverParams, $name, $value);
        }
    }
Set server parameter like from '$_SERVER'
@param string $name
@param mixed  $value