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');

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