VB.NET

curl with Variable Substitution in the Request Body

See more CURL Examples

This example demonstrates using variables located in the request body with the {{variable_name}} syntax. VB.NET

Dim success As Boolean = False

' 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}}}'

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

Dim curl As New 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.
Dim sbRawRequest As New Chilkat.StringBuilder
success = curl.ToRawRequest(sbCurl.GetAsString(),sbRawRequest)
If (success = False) Then
    Debug.WriteLine(curl.LastErrorText)
    Exit Sub
End If


Debug.WriteLine(sbRawRequest.GetAsString())

' 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 False

curl.EnableBodyVars = False

success = curl.ToRawRequest(sbCurl.GetAsString(),sbRawRequest)
If (success = False) Then
    Debug.WriteLine(curl.LastErrorText)
    Exit Sub
End If


Debug.WriteLine(sbRawRequest.GetAsString())

' The raw request with body variable substitution disable:

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