(DataFlex) Debug REST HTTP Request

Demonstrates how to generate the HTTP Request (with all headers intact) without actually sending the request.

Note: This example requires Chilkat v9.5.0.77 or later.

Chilkat ActiveX Downloads ActiveX for 32-bit and 64-bit Windows

Use ChilkatAx-win32.pkg

Procedure Test
    Handle hoRest
    Boolean iBTls
    Integer iPort
    Boolean iBAutoReconnect
    Boolean iSuccess
    Handle hoJson
    Variant vSbRequestBody
    Handle hoSbRequestBody
    Variant vSbResponseBody
    Handle hoSbResponseBody
    Variant vBdRequest
    Handle hoBdRequest
    String sTemp1
    Integer iTemp1

    // This example requires the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    // This example will connect to the web server, but does not actually send a request.
    // When in DebugMode, the request is composed in memory and can be retrieved by calling
    // GetLastDebugRequest.

    Get Create (RefClass(cComChilkatRest)) To hoRest
    If (Not(IsComObjectCreated(hoRest))) Begin
        Send CreateComObject of hoRest
    End

    // Connect Code...
    // URL: https://test-api.service.hmrc.gov.uk/organisations/vat/MY_HMRC_VRN/returns
    Move True To iBTls
    Move 443 To iPort
    Move True To iBAutoReconnect
    Get ComConnect Of hoRest "test-api.service.hmrc.gov.uk" iPort iBTls iBAutoReconnect To iSuccess
    If (iSuccess <> True) Begin
        Get ComConnectFailReason Of hoRest To iTemp1
        Showln "ConnectFailReason: " iTemp1
        Get ComLastErrorText Of hoRest To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    // Build the request body...
    Get Create (RefClass(cComChilkatJsonObject)) To hoJson
    If (Not(IsComObjectCreated(hoJson))) Begin
        Send CreateComObject of hoJson
    End
    Get ComUpdateString Of hoJson "periodKey" "A001" To iSuccess
    Get ComUpdateNumber Of hoJson "vatDueSales" "105.50" To iSuccess
    Get ComUpdateNumber Of hoJson "vatDueAcquisitions" "-100.45" To iSuccess
    Get ComUpdateNumber Of hoJson "totalVatDue" "5.05" To iSuccess
    Get ComUpdateNumber Of hoJson "vatReclaimedCurrPeriod" "105.15" To iSuccess
    Get ComUpdateNumber Of hoJson "netVatDue" "100.10" To iSuccess
    Get ComUpdateInt Of hoJson "totalValueSalesExVAT" 300 To iSuccess
    Get ComUpdateInt Of hoJson "totalValuePurchasesExVAT" 300 To iSuccess
    Get ComUpdateInt Of hoJson "totalValueGoodsSuppliedExVAT" 3000 To iSuccess
    Get ComUpdateInt Of hoJson "totalAcquisitionsExVAT" 3000 To iSuccess
    Get ComUpdateBool Of hoJson "finalised" True To iSuccess

    // Add Headers...
    Get ComAddHeader Of hoRest "Accept" "application/vnd.hmrc.1.0+json" To iSuccess
    Get ComAddHeader Of hoRest "Authorization" "Bearer HMRC_ACCESS_TOKEN" To iSuccess
    Get ComAddHeader Of hoRest "Content-Type" "application/json" To iSuccess

    Get Create (RefClass(cComChilkatStringBuilder)) To hoSbRequestBody
    If (Not(IsComObjectCreated(hoSbRequestBody))) Begin
        Send CreateComObject of hoSbRequestBody
    End
    Get pvComObject of hoSbRequestBody to vSbRequestBody
    Get ComEmitSb Of hoJson vSbRequestBody To iSuccess

    // Set DebugMode so that no request is actually sent.
    Set ComDebugMode Of hoRest To True

    Get Create (RefClass(cComChilkatStringBuilder)) To hoSbResponseBody
    If (Not(IsComObjectCreated(hoSbResponseBody))) Begin
        Send CreateComObject of hoSbResponseBody
    End
    Get pvComObject of hoSbRequestBody to vSbRequestBody
    Get pvComObject of hoSbResponseBody to vSbResponseBody
    Get ComFullRequestSb Of hoRest "POST" "/organisations/vat/MY_HMRC_VRN/returns" vSbRequestBody vSbResponseBody To iSuccess
    If (iSuccess <> True) Begin
        Get ComLastErrorText Of hoRest To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    // Get the exact contents of what would've been sent.
    // This includes the HTTP start line, the HTTP request headers, and the request body.
    // Given that it's possible for the request body to contain binary data,
    // the GetLastDebugRequest fetches into a BinData object.
    // In this case, however, our request body contained JSON, so we can
    // examine it as a string..
    Get Create (RefClass(cComChilkatBinData)) To hoBdRequest
    If (Not(IsComObjectCreated(hoBdRequest))) Begin
        Send CreateComObject of hoBdRequest
    End
    Get pvComObject of hoBdRequest to vBdRequest
    Get ComGetLastDebugRequest Of hoRest vBdRequest To iSuccess

    Showln "----"
    Get ComGetString Of hoBdRequest "utf-8" To sTemp1
    Showln sTemp1
    Showln "----"

    // The output for the above case:

    // POST /organisations/vat/MY_HMRC_VRN/returns HTTP/1.1
    // Accept: application/vnd.hmrc.1.0+json
    // Host: test-api.service.hmrc.gov.uk
    // Authorization: Bearer HMRC_ACCESS_TOKEN
    // Content-Type: application/json
    // Content-Length: 281
    // 
    // {"periodKey":"A001","vatDueSales":105.50, ... ,"finalised":true}
    // 
    // 


End_Procedure