respond method

Future<void> respond({ int? status, Map<String, String>? headers, String? contentType, dynamic body, })

Fulfills request with given response. To use this, request interception should be enabled with page.setRequestInterception. Exception is thrown if request interception is not enabled.

An example of fulfilling all requests with 404 responses:

await page.setRequestInterception(true);
page.onRequest.listen((request) {
  request.respond(status: 404, contentType: 'text/plain', body: 'Not Found!');
});

NOTE Mocking responses for dataURL requests is not supported. Calling request.respond for a dataURL request is a noop.

Parameters:

• status: Response status code, defaults to 200.
• headers: Optional response headers
• contentType: If set, equals to setting Content-Type response header
• body: Optional response body

Implementation

Future<void> respond(
    {int? status,
    Map<String, String>? headers,
    String? contentType,
    body}) async {
  // Mocking responses for dataURL requests is not currently supported.
  if (url.startsWith('data:')) return;
  assert(allowInterception, 'Request Interception is not enabled!');
  assert(!_interceptionHandled, 'Request is already handled!');
  _interceptionHandled = true;

  headers ??= {};

  if (contentType != null) {
    headers['content-type'] = contentType;
  }

  List<int>? bodyBytes;
  if (body is String) {
    bodyBytes = utf8.encode(body);
  }
  if (body is List<int>) {
    bodyBytes = body;
  }

  if (bodyBytes != null && !headers.containsKey('content-length')) {
    headers['content-length'] = bodyBytes.length.toString();
  }

  await _fetchApi
      .fulfillRequest(fetch.RequestId(interceptionId!), status ?? 200,
          responseHeaders: headers.entries
              .map((e) => fetch.HeaderEntry(
                  name: e.key.toLowerCase(), value: e.value))
              .toList(),
          responsePhrase: _statusTexts[status ?? 200],
          body: body != null ? base64.encode(bodyBytes!) : null)
      .catchError((error) {
    // In certain cases, protocol will return error if the request was already canceled
    // or the page was closed. We should tolerate these errors.
    _logger.finer('[Request.respond] swallow error: $error');
  });
}