data
data: string | Uint8Array
OptionaldisableFetchKeepAlive
disableFetchKeepAlive?: boolean
OptionaldisableXhrSync
disableXhrSync?: boolean
Optionalheaders
headers?: { 
    [name: string]: string; 
}
Optionaltimeout
timeout?: number
urlString
urlString: string
IPayloadData describes interface of payload sent via POST channel