Request sending time

Time format： RFC1123 Format

format：EEE, DD MM YYYY HH:MM:SS ZZZ

Sample：Thu, 04 Nov 2021 03:39:28 GMT

Notice: Greenwich Mean Time (GMT) is Beijing Time (GMT+8) minus 8 hours.
When the time is more than 15 minutes different from the server time, the request will be
be denied, and a HTTP 401 returned.

The standard HTTP header carries the authentication signature.

Format: WallTech < Token>: <Base64 Encoded HMAC SHA-1 Hash>

Sample：WallTech test5AdbzO5OEeOpvgAVXUFE0A:LhpcUyKXCaGcn3tVPwY4nX44XTA=

Explain:

<Access Token>: API Token
<Base64 Encoded HMAC SHA-1 Hash>

Through the key, such as key=79db9e5OEeOpvgAVXUFWSD, use the SecretKeySpec
SecretKeySpec class to encrypt the key in HmacSHA1 mode, and then initialize a Mac object with the
the algorithm HmacSHA1, and then use the key to initialize the Mac object. Finally, the Mac
Mac objectis processed as Byte, and then Base64 conversion operation is performed on it.