Classic ASP Requires Chilkat v11.5.0+
curl with Variable Substitution in the Request Body

This example demonstrates using variables located in the request body with the {{variable_name}} syntax.
Chilkat Classic ASP Downloads

Classic ASP
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
</head>
<body>
<%
success = 0

'  Variables can also be used within the HTTP request body.
'  Variable names are enclosed between {{ and }}

'  Here is a curl command with two variables {{name}} and {{age}} located in the data.

'  curl -X POST https://api.example.com/data \
'    -H "Content-Type: application/json" \
'    -d '{"name":"{{name}}","age":{{age}}}'

set sbCurl = Server.CreateObject("Chilkat.StringBuilder")
success = sbCurl.AppendLn("curl -X POST https://api.example.com/data \")
success = sbCurl.AppendLn("  -H ""Content-Type: application/json"" \")
success = sbCurl.AppendLn("  -d '{""name"":""{{name}}"",""age"":{{age}}}'")

set curl = Server.CreateObject("Chilkat.HttpCurl")

'  Provide values for variables.
curl.SetVar "name","Alice"
curl.SetVar "age","30"

'  To demonstrate how the variables are replaced, this example does not execute the curl command. 
'  Instead, it generates the raw HTTP request that would be sent if the curl command were run.
set sbRawRequest = Server.CreateObject("Chilkat.StringBuilder")
success = curl.ToRawRequest(sbCurl.GetAsString(),sbRawRequest)
If (success = 0) Then
    Response.Write "<pre>" & Server.HTMLEncode( curl.LastErrorText) & "</pre>"
    Response.End
End If

Response.Write "<pre>" & Server.HTMLEncode( sbRawRequest.GetAsString()) & "</pre>"

'  Output:

'  POST /data HTTP/1.1
'  Host: api.example.com
'  Content-Type: application/json
'  Content-Length: 25
'  
'  {"name":"Alice","age":30}

'  --------------------------------------------------------------------------------------------------
'  Note: Variable substitution in the request body can be turned off by 
'  setting the EnableBodyVars property equal to 0

curl.EnableBodyVars = 0

success = curl.ToRawRequest(sbCurl.GetAsString(),sbRawRequest)
If (success = 0) Then
    Response.Write "<pre>" & Server.HTMLEncode( curl.LastErrorText) & "</pre>"
    Response.End
End If

Response.Write "<pre>" & Server.HTMLEncode( sbRawRequest.GetAsString()) & "</pre>"

'  The raw request with body variable substitution disable:

'  Host: api.example.com
'  Content-Type: application/json
'  Content-Length: 33
'  
'  {"name":"{{name}}","age":{{age}}}

%>
</body>
</html>