This basically grabs the request parameter with the image name, looks it up in the database, and returns all the information about that image, separated by pipes (| s), just like the spec said.

上述代码会获得请求参数以及图像名称、在数据库中查找它并返回所有有关此图像的信息(由管道符|分隔)，正如规范所规定的一样。