(JavaScript) curl with Variable Substitution in the Request Body

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Note: This example requires Chilkat v11.5.0 or greater.

Note

This example is intended for running within a Chilkat.Js embedded JavaScript engine. All Chilkat JavaScript examples require Chilkat v11.4.0 or greater.

var success = 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}}}'

var sbCurl = new CkStringBuilder();
sbCurl.AppendLn("curl -X POST https://api.example.com/data \\");
sbCurl.AppendLn("  -H \"Content-Type: application/json\" \\");
sbCurl.AppendLn("  -d '{\"name\":\"{{name}}\",\"age\":{{age}}}'");

var curl = new CkHttpCurl();

// 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.
var sbRawRequest = new CkStringBuilder();
success = curl.ToRawRequest(sbCurl.GetAsString(),sbRawRequest);
if (success == false) {
    console.log(curl.LastErrorText);
    return;
}

console.log(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) {
    console.log(curl.LastErrorText);
    return;
}

console.log(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}}}