Common Request Headers

**Table 1** Common request headers
Name	Description	Mandatory	Example
X-Auth-Token	User token.	Yes for token-based authentication	-
Content-Type	Content type, which is application/json;charset=utf-8.	Yes	application/json;charset=utf8
x-sdk-date	Time to send a request, which is in the format of YYYYMMDD'T'HHMMSS'Z'. GMT time is used.	Yes for Access Key ID/Secret Access Key (AK/SK)-based authentication	20160629T101459Z
Authorization	Signature authentication information, which is obtained from the result of request signing.	Yes for AK/SK-based authentication	-
Host	Request server information, which is obtained from the URL of a service API. The value is hostname[:port]. If no port is specified, the default port will be used. For HTTPS, port 443 is used by default.	Yes for AK/SK-based authentication	-