bug Unable to boot ApiServiceProvider, configure an API domain or prefix.

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laravel5.5装了个dingo/api,然后感觉整个人都不好，看着挺吓人的报错

RuntimeException
Unable to boot ApiServiceProvider, configure an API domain or prefix.

详情报错如下

/home/vagrant/code/larbbs/vendor/dingo/api/src/Provider/DingoServiceProvider.phpif (class_exists('Illuminate\Foundation\Application', false)) {$this->commands([\Dingo\Api\Console\Command\Cache::class,\Dingo\Api\Console\Command\Routes::class,]);}}/*** Register the configuration.** @return void*/protected function registerConfig(){$this->mergeConfigFrom(realpath(__DIR__.'/../../config/api.php'), 'api');if (! $this->app->runningInConsole() && empty($this->config('prefix')) && empty($this->config('domain'))) {throw new RuntimeException('Unable to boot ApiServiceProvider, configure an API domain or prefix.');}}/*** Register the class aliases.** @return void*/protected function registerClassAliases(){$aliases = [\Dingo\Api\Http\Request::class => \Dingo\Api\Contract\Http\Request::class,'api.dispatcher' => \Dingo\Api\Dispatcher::class,'api.http.validator' => \Dingo\Api\Http\RequestValidator::class,'api.http.response' => \Dingo\Api\Http\Response\Factory::class,'api.router' => \Dingo\Api\Routing\Router::class,'api.router.adapter' => \Dingo\Api\Contract\Routing\Adapter::class,'api.auth' => \Dingo\Api\Auth\Auth::class,'api.limiting' => \Dingo\Api\Http\RateLimit\Handler::class,'api.transformer' => \Dingo\Api\Transformer\Factory::class,
Arguments
"Unable to boot ApiServiceProvider, configure an API domain or prefix."

分析：
domain或prefix配置出错，后续详情（斜体）代码也讲了，这两个玩意不能同时为空，否则抛出这个东东。
于明了，肯定是.env基础配置文件内没有这两个配置项的值，或者是有但值皆为空。改了就是。
.env.php增加如下内容

    API_PREFIX=nullAPI_DOMAIN=larbbs.api

补充：
1. laravel框架会首先加载.env内配置文件内容
2. config文件夹下的配置，会在后续覆盖相同配置项，也就是合并

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