Dart 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. Dart

import 'package:chilkat/chilkat.dart';

void main() {
  // 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}}}'

  final sbCurl = 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}}}\'');

  final curl = 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.
  final sbRawRequest = CkStringBuilder();
  try {
    curl.toRawRequest(sbCurl.getAsString(), sbRawRequest);
  } on ChilkatException catch (e) {
    print(e.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;

  try {
    curl.toRawRequest(sbCurl.getAsString(), sbRawRequest);
  } on ChilkatException catch (e) {
    print(e.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}}}
}