Using JavaScript to properly sign a string using HmacSHA256
问题 In the Houndify API Docs for Authentication, you have the following block of content: An Example of Authenticating a Request Let's assume we have the following information: UserID: ae06fcd3-6447-4356-afaa-813aa4f2ba41 RequestID: 70aa7c25-c74f-48be-8ca8-cbf73627c05f Timestamp: 1418068667 ClientID: KFvH6Rpy3tUimL-pCUFpPg== ClientKey: KgMLuq-k1oCUv5bzTlKAJf_mGo0T07jTogbi6apcqLa114CCPH3rlK4c0RktY30xLEQ49MZ-C2bMyFOVQO4PyA== Concatenate the UserID string, RequestID string, and TimeStamp string in