RequestHelper

Class of network request helper，requests made through methods in this class automatically add signature information to the Http Header.

RequestHelper

Parameter	Type	Remarks
appKey	string	App in authentication information issued by authorized party
securityKey	string	Security in authentication information issued by authorized party
domain	string	Domain of network request, starting with http or https

This method provides the capability to send post requests asynchronously.

Parameters：

Parameter	Type	Remarks
url	string	The specific path of the network request, exclusive of the domain part.
postData	`Dictionary<string, object>`	Request parameters
sign	string	Signature value of this request
nonce	string	Nonce of this request
timestamp	string	Time stamp of this request

Return：

Task<string>

Possible exceptions：

Exception information	Exception cause	Exception type
Signature verification failure	Unauthorized	HttpRequestException
Request target internal error	InternalServerError	HttpRequestException
Request path not found	NotFound	HttpRequestException
Request failure	Other	HttpRequestException

This method provides the capability to send post requests asynchronously.

This method is an overload of the previous method. Except for different parameters, other behaviors are consistent.

Parameter：

Parameter	Type	Remarks
url	string	The specific path of the network request, exclusive of the domain part.
postData	`Dictionary<string, object>`	Request parameters

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