Dart

Send HTTP POST using non-UTF8 such as Windows-1250

See more HTTP Examples

Demonstrates how to specify the character encoding (charset) to be used for the body of an HTTP POST. Dart

import 'package:chilkat/chilkat.dart';

void main() {
  // This example requires the Chilkat API to have been previously unlocked.
  // See Global Unlock Sample for sample code.

  final http = CkHttp();

  final req = CkHttpRequest();

  // Load a JSON file containing strings with Polish chars.
  final json = CkJsonObject();
  try {
    json.loadFile('qa_data/json/has_polish_chars.json');
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  // Add the request params expected by the server-side:
  req.addParam('tytul', json.stringOf('tytul'));
  req.addParam('tresc', json.stringOf('tresc'));

  // Indicate we wish to explicitly send the charset attribute in the HTTP request header.
  req.sendCharset = true;

  // Send the POST
  // You can send the POST to the URL below.  It will respond with the request body in quoted-printable format.
  // Using quoted-printable, we can easily see the binary bytes for the accented chars.

  req.httpVerb = 'POST';
  req.contentType = 'application/x-www-form-urlencoded';

  final resp = CkHttpResponse();
  try {
    http.httpReq('https://www.chilkatsoft.com/echoPost.cshtml', req, resp);
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  print(http.lastHeader);
  print(resp.bodyStr);

  // Sample output:

  // --------------------------------------------------
  // POST /echoPost.cshtml HTTP/1.1
  // Host: www.chilkatsoft.com
  // Content-Type: application/x-www-form-urlencoded; charset=utf-8
  // Content-Length: 79
  // 
  // <pre>tytul=3DPrzyk%C5%82ad&amp;tresc=3DPrzyk%C5%82ad
  // %82oszenie</pre>
  // --------------------------------------------------

  // We can see by the %C5%82 that utf-8 was sent, because %C5%82 is the 2-byte representation of a particular Polish char.

  // -----------------------
  // However.. we can change the charset used for the HTTP request by specifying the request object's charset.

  req.sendCharset = true;
  req.charset = 'windows-1250';
  req.httpVerb = 'POST';
  req.contentType = 'application/x-www-form-urlencoded';

  try {
    http.httpReq('https://www.chilkatsoft.com/echoPost.cshtml', req, resp);
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  print(http.lastHeader);
  print(resp.bodyStr);

  // Sample output...
  // You can see how the bytes used for the Polish chars are now 1-byte per char (i.e. using Windows-1250) 

  // --------------------------------------------------
  // POST /echoPost.cshtml HTTP/1.1
  // Host: www.chilkatsoft.com
  // Content-Type: application/x-www-form-urlencoded; charset=windows-1250
  // Content-Length: 70
  // 
  // <pre>tytul=3DPrzyk%B3ad&amp;tresc=3DPrzyk%B3ad
  // e</pre>
  // --------------------------------------------------
}