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DataFlex Examples

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(DataFlex) Creating an application/json HTTP POST Request

Demonstrates how to create an HTTP POST request having the Content-Type application/json, where the body of the HTTP request is the following JSON:

{
   "username" : "my_username",
   "password" : "my_password",
   "validation-factors" : {
      "validationFactors" : [
         {
            "name" : "remote_address",
            "value" : "127.0.0.1"
         }
      ]
   }
}

The generated HTTP request looks like this:

POST /something HTTP/1.1
Content-Type: application/json
Accept: application/json
Host: domain
Content-Length: 216

{
  "username": "my_username",
  "password": "my_password",
  "validation-factors": {
    "validationFactors": [
      {
        "name": "remote_address",
        "value": "127.0.0.1"
      }
    ]
  }
}

Chilkat ActiveX Downloads

ActiveX for 32-bit and 64-bit Windows

Use ChilkatAx-9.5.0-win32.pkg

Procedure Test
    Handle hoReq
    Handle hoJson
    Variant vVFactors
    Handle hoVFactors
    Variant vVArray
    Handle hoVArray
    Variant vFactorObj
    Handle hoFactorObj
    String sRequestMime
    String sTemp1

    //  This example demonstrates building an application/json request.

    Get Create (RefClass(cComChilkatHttpRequest)) To hoReq
    If (Not(IsComObjectCreated(hoReq))) Begin
        Send CreateComObject of hoReq
    End

    //  The ContentType, HttpVerb, and Path properties should
    //  always be explicitly set.
    Set ComHttpVerb Of hoReq To "POST"
    Set ComPath Of hoReq To "/something"
    Set ComContentType Of hoReq To "application/json"

    //  We may wish to add an "Accept" header to the request.
    //  This tells the server we'll accept an application/json response.
    Send ComAddHeader To hoReq "Accept" "application/json"

    //  We'll use Chilkat's JSON API to create the JSON body of the HTTP request.
    Get Create (RefClass(cComChilkatJsonObject)) To hoJson
    If (Not(IsComObjectCreated(hoJson))) Begin
        Send CreateComObject of hoJson
    End
    Get ComAppendString Of hoJson "username" "my_username" To iSuccess
    Get ComAppendString Of hoJson "password" "my_password" To iSuccess
    Get ComAppendObject Of hoJson "validation-factors" To vVFactors
    If (IsComObject(vVFactors)) Begin
        Get Create (RefClass(cComChilkatJsonObject)) To hoVFactors
        Set pvComObject Of hoVFactors To vVFactors
    End
    Get ComAppendArray Of hoVFactors "validationFactors" To vVArray
    If (IsComObject(vVArray)) Begin
        Get Create (RefClass(cComChilkatJsonArray)) To hoVArray
        Set pvComObject Of hoVArray To vVArray
    End
    Get ComAddObjectAt Of hoVArray 0 To iSuccess
    Get ComObjectAt Of hoVArray 0 To vFactorObj
    If (IsComObject(vFactorObj)) Begin
        Get Create (RefClass(cComChilkatJsonObject)) To hoFactorObj
        Set pvComObject Of hoFactorObj To vFactorObj
    End
    Get ComAppendString Of hoFactorObj "name" "remote_address" To iSuccess
    Get ComAppendString Of hoFactorObj "value" "127.0.0.1" To iSuccess
    Send Destroy of hoFactorObj
    Send Destroy of hoVArray
    Send Destroy of hoVFactors

    //  Use the JSON for the HTTP request body
    //  By default, the Emit method will output compact JSON.
    //  This is best for generating the smallest size request.
    //  To generate a more human-readable (pretty-printed) JSON request body,
    //  set the EmitCompact property to FALSE
    Set ComEmitCompact Of hoJson To False
    Get ComEmit Of hoJson To sTemp1
    Get ComLoadBodyFromString Of hoReq sTemp1 "utf-8" To iSuccess

    //  View the request that would be sent if SynchronousRequest was called:
    Get ComGenerateRequestText Of hoReq To sRequestMime
    Showln sRequestMime

    //  A few important comments about the HTTP request that is generated:
    // 
    //  1) The Content-Length header is automatically generated based on the actual length of the MIME message
    //     that follows the intial (topmost) MIME header.
    //  2) The HOST header will automatically get filled in with the actual domain when SynchronousRequest
    //     is called.


End_Procedure

 

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