Swift Requires Chilkat v11.5.0+

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. Swift

func chilkatTest() {
    var success: Bool = 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}}}'

    let sbCurl = CkoStringBuilder()!
    sbCurl.appendLn(str: "curl -X POST https://api.example.com/data \\")
    sbCurl.appendLn(str: "  -H \"Content-Type: application/json\" \\")
    sbCurl.appendLn(str: "  -d '{\"name\":\"{{name}}\",\"age\":{{age}}}'")

    let curl = CkoHttpCurl()!

    //  Provide values for variables.
    curl.setVar(varName: "name", varValue: "Alice")
    curl.setVar(varName: "age", varValue: "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.
    let sbRawRequest = CkoStringBuilder()!
    success = curl.toRawRequest(curlCommand: sbCurl.getAsString(), sb: sbRawRequest)
    if success == false {
        print("\(curl.lastErrorText!)")
        return
    }

    print("\(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(curlCommand: sbCurl.getAsString(), sb: sbRawRequest)
    if success == false {
        print("\(curl.lastErrorText!)")
        return
    }

    print("\(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}}}

}