AutoIt Requires Chilkat v11.5.0+

curl with Variable Substitution in a JSON Request Body

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This example shows how to use variables inside a JSON request body using the {{variable_name}} syntax. When the HTTP request’s Content-Type indicates JSON, Chilkat automatically applies proper JSON escaping to each substituted value, ensuring the resulting JSON remains valid. AutoIt

Local $bSuccess = False

;  Variable names are enclosed between {{ and }}
;  Important: The variable {{var_name}} should be placed inside the quotes.

;  This is correct:
;  curl -X POST https://api.example.com/messages \
;    -H "Content-Type: application/json" \
;    -d '{"text":"{{message}}"}'

;  This is incorrect:
;    -d '{"text":{{message}}}'

$oSbCurl = ObjCreate("Chilkat.StringBuilder")
$oSbCurl.AppendLn("curl -X POST https://api.example.com/messages \")
$oSbCurl.AppendLn("  -H ""Content-Type: application/json"" \")
$oSbCurl.AppendLn("  -d '{""text"":""{{message}}""}'")

$oCurl = ObjCreate("Chilkat.HttpCurl")

;  In this example, the value we'll provide for the "message" variable
;  will contain chars that require JSON escaping.
$oCurl.SetVar "message","He said ""Hello, world!"""

;  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.
$oSbRawRequest = ObjCreate("Chilkat.StringBuilder")
$bSuccess = $oCurl.ToRawRequest($oSbCurl.GetAsString(),$oSbRawRequest)
If ($bSuccess = False) Then
    ConsoleWrite($oCurl.LastErrorText & @CRLF)
    Exit
EndIf

ConsoleWrite($oSbRawRequest.GetAsString() & @CRLF)

;  The output is shown below.
;  Notice that the quote chars around "Hello World!" are properly JSON escaped.

;  POST /messages HTTP/1.1
;  Host: api.example.com
;  Content-Type: application/json
;  Content-Length: 36
;  
;  {"text":"He said \"Hello, world!\""}