提供图像以获取请求
我正在使用 CodeIgniter 休息控制器.我希望能够在客户端发出的 GET 请求上提供图像.
I am using CodeIgniter rest Controller. I want to be able to serve images on GET requests made by the client.
这是最好的选择还是我应该只提供图像的链接并让客户自己下载?如果我可以提供图像本身，那么我应该如何提供?
Is this the best option or should i just provide a link to the image and let the client download it themselves? If I can serve the images itself, than how should I?
推荐答案
为了让 CodeIgniter 设置正确的标题，你可以在你的控制器中做到这一点:
To make CodeIgniter set the proper headers and such you could do this in your controller:
$this->output->set_content_type('jpeg')->set_output(file_get_contents('path_to_file'));
它会将图像内容作为文件输出(作为请求响应).无需查看.
And it will output (as request response) the image content as a file. No view required.
请注意，这会带来一些额外的开销，因为文件是由 PHP 处理的，而不仅仅是网络服务器 (Apache/Nginx).只有当您需要对请求有一些业务逻辑时才有意义，例如日志记录或授权(尽管即使没有 PHP 也可以完成).如果您只是输出图像，最好直接链接到文件并将 PHP 排除在外.
Please note though that this is a bit of extra overhead as the file is processed by PHP instead of just the webserver (Apache/Nginx). It only makes sense if you need to have some business logic on the request, such as logging or authorization (though even that can be done without PHP). If you are just outputing the image it is therefor better to link straight to file and leave PHP out of it.
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