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Description:

cancellation token http

Dart Cancellation Token: HTTP #
A fork of Dart's HTTP package with request cancellation using cancellation_token.
Currently based on version 0.13.5 of the HTTP package.
Features #

Retains all original functionality of the HTTP package.
Cancel HTTP requests using CancellationTokens.
Pair with the cancellation_token package to make a cancellable API request and parse the response JSON in a cancellable isolate using a single token.

Using #
This package keeps the same APIs as the base HTTP package, but with the addition of optional cancellationToken parameters. For more information on CancellationTokens, refer to CancellationTokens.
import 'package:cancellation_token_http/http.dart' as http;

var token = http.CancellationToken();
try {
// A single CancellationToken can be used for multiple requests
var readResponse = await http.read(
Uri.parse('https://example.com/foobar.txt'),
cancellationToken: token,
);
var postResponse = await http.post(
Uri.parse('https://example.com/whatsit/create'),
body: {'name': 'doodle', 'color': 'blue'},
cancellationToken: token,
);
print('Read response: $readReponse');
print('Post response status: ${postResponse.statusCode}');
print('Post response body: ${postResponse.body}');
} on http.CancelledException {
// If `token.cancel()` is called, the request will be cancelled and a
// CancelledException will be thrown
print('Request cancelled');
}
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Parsing JSON in an isolate #
To parse JSON responses in a cancellable isolate, add the cancellation_token package to your project and use the same CancellationToken for both the API request and cancellableCompute():
import 'package:cancellation_token/cancellation_token.dart';
import 'package:cancellation_token_http/http.dart' as http;

Future<void> makeRequest() async {
var token = CancellationToken();
try {
var response = await http.get(
Uri.parse('https://example.com/bigjson'),
cancellationToken: token,
);
var parsedResponse = cancellableCompute(
_readAndParseJson,
response.body,
token,
);
print('Request and parse complete');
} on CancelledException {
// If `token.cancel()` is called, the request and response parsing will be
// cancelled and a CancelledException will be thrown
print('Request and parse cancelled');
}
}

static ChunkyApiResponse _readAndParseJson(String json) {
final Map<String, dynamic> decodedJson = jsonDecode(json);
return ChunkyApiResponse.fromJson(decodedJson);
}
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