Dart

Send a Staged REST Request from a StringBuilder

Demonstrates Rest.SendReqSb, which sends a request whose text body is read from a StringBuilder, then reads the response in separate steps.

Background. The staged request model separates sending from reading: a SendReq method transmits the request, ReadResponseHeader reads the status line and headers, and a ReadResp method reads the body. This gives fine control over large or streamed messages compared with the single-call full-request methods.

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Dart

import 'package:chilkat/chilkat.dart';

void main() {
  final rest = CkRest();
  final bTls = true;
  final bAutoReconnect = true;
  try {
    rest.connect('example.com', 443, bTls, bAutoReconnect);
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  rest.addHeader('Content-Type', 'application/json');

  // Send a request whose text body is read from a StringBuilder.
  final sbBody = CkStringBuilder();
  sbBody.append('{ "query": "chilkat" }');
  try {
    rest.sendReqSb('POST', '/api/search', sbBody);
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  // After sending, read the response status line and header fields.  The return value is the HTTP
  // status code, or -1 if no response was received.
  final statusCode = rest.readResponseHeader();
  if (statusCode < 0) {
    print(rest.lastErrorText);
    return;
  }

  print('Response status code: $statusCode');

  // Read the response body as text.
  final String responseBody;
  try {
    responseBody = rest.readRespBodyString();
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  print(responseBody);
}