send method
Future<StreamedResponse>
send(
- BaseRequest request, {
- CancellationToken? cancellationToken,
override
Sends an HTTP request and asynchronously returns the response.
Implementation
@override
Future<StreamedResponse> send(
BaseRequest request, {
CancellationToken? cancellationToken,
}) async {
if (cancellationToken?.isCancelled ?? false) {
throw cancellationToken!.exception!;
} else if (_isClosed) {
throw ClientException(
'HTTP request failed. Client is already closed.', request.url);
}
HttpRequest? xhr = HttpRequest();
final completer = CancellableCompleter<StreamedResponse>.sync(
cancellationToken,
onCancel: () {
_xhrs.remove(xhr);
xhr.abort();
},
);
unawaited(request.finalize().toBytes().then((bytes) async {
// Don't continue if the request has been cancelled at this point
if (cancellationToken?.isCancelled ?? false) return;
// Prepare the request
_xhrs.add(xhr);
xhr
..open(request.method, '${request.url}', async: true)
..responseType = 'arraybuffer'
..withCredentials = withCredentials;
request.headers.forEach(xhr.setRequestHeader);
// Prepare the response handler
unawaited(xhr.onLoad.first.then((_) {
var body = (xhr.response as ByteBuffer).asUint8List();
completer.complete(StreamedResponse(
ByteStream.fromBytes(body),
xhr.status!,
contentLength: body.length,
request: request,
headers: xhr.responseHeaders,
reasonPhrase: xhr.statusText,
));
_xhrs.remove(xhr);
}));
// Prepare the error handler
unawaited(xhr.onError.first.then((_) {
// Unfortunately, the underlying XMLHttpRequest API doesn't expose any
// specific information about the error itself.
completer.completeError(
ClientException('XMLHttpRequest error.', request.url),
StackTrace.current,
);
_xhrs.remove(xhr);
}));
// Send the request
xhr.send(bytes);
}));
return completer.future;
}