Common Request Header Fields

**Table 1** Common request header fields
Name	Description	Mandatory	Example
x-sdk-date	Time when a request is sent. The format is yyyyMMdd'T'HHmmss'Z'. The value is the current GMT time of the system.	No Mandatory for AK/SK authentication	20160629T101459Z
Authorization	Authentication information. It is the result of request signing. For details, see Signing a Request.	No Mandatory for AK/SK authentication	-
Host	Information about the requested server, in the hostname[:port] format. The value can be obtained from the URL of the service API. If the port number is not specified, the default port is used. The default port number for https is 443.	No Mandatory for AK/SK authentication	mkt-euro.myhuaweicloud.com
Content-type	MIME type of the body in the request.	Yes	application/json