Dart

Remove a MIME Header Field

Demonstrates the Chilkat Mime.RemoveHeaderField method, which removes header fields whose name matches case-insensitively. The first argument is the field name and the second (bAllOccurrences) selects whether to remove all matches or only the first. It is a void method.

Note: The file path is relative to the application's current working directory. Absolute paths may also be used. Supply the path to your own file.

Background: Stripping headers is common when reprocessing a message — removing spam-scoring X- headers, clearing an old Content-Length before re-serializing, or deleting routing headers before forwarding. The all-occurrences flag matters for headers that can repeat: pass true to purge every instance, or false to drop just the first.

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Dart

import 'package:chilkat/chilkat.dart';

void main() {
  final mime = CkMime();
  try {
    mime.loadMimeFile('qa_data/message.eml');
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  // Remove header fields whose name matches (case-insensitively).  The 1st argument is the field
  // name and the 2nd (bAllOccurrences) selects whether to remove all matches or only the first.
  // RemoveHeaderField is a void method.

  // Remove every X-Spam-Status header.
  final bAllOccurrences = true;
  mime.removeHeaderField('X-Spam-Status', bAllOccurrences);

  print('Removed the header field(s).');
}