获取当前请求的所有HTTP 请求头信息,如: ~~~ $headers = $request->header(); print_r($headers); ~~~ 直接获取某个请求头信息,如: ~~~ $token = $request->header('XX-Token'); ~~~ HTTP请求头信息的名称不区分大小写,并且下划线会自动转换为-,所以下面的写法都是等效的: ~~~ $token = $request->header('xx-token'); $token = $request->header('XX-Token'); $token = $request->header('xx_token'); ~~~