Add an HTTP library that wraps dart:io.

pkg/http/lib/http.dart

Index: pkg/http/lib/http.dart
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+// Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+/// A composable, [Future]-based library for making HTTP requests.
+///
+/// The easiest way to use this library is via the top-level functions. They
+/// allow you to make individual HTTP requests with minimal hassle:
+///
+///     import 'package:http/http.dart' as http;
+///
+///     var url = "http://example.com/whatsit/create";
+///     http.post(url, fields: {"name": "doodle", "color": "blue"})
+///         .then((response) {
+///       print("Response status: ${response.statusCode}");
+///       print("Response body: ${response.body}");
+///     });
+///
+///     http.read("http://example.com/foobar.txt").then(print);
+///
+/// If you're making multiple requests to the same server, you can keep open a
+/// persistent connection by using a [Client] rather than making one-off
+/// requests. If you do this, make sure to close the client when you're done:
+///
+///     var client = new http.Client();
+///     client.post(
+///         "http://example.com/whatsit/create",
+///         fields: {"name": "doodle", "color": "blue"})
+///       .chain((response) => client.get(response.bodyFields['uri']))
+///       .transform((response) => print(response.body))
+///       .onComplete((_) => client.close());
+///
+/// You can also exert more fine-grained control over your requests and
+/// responses by creating [Request] or [StreamedRequest] objects yourself and
+/// passing them to [Client.send].
+///
+/// This package is designed to be composable. This makes it easy for external
+/// libraries to work with one another to add behavior to it. Libraries wishing
+/// to add behavior should create a subclass of [BaseClient] that wraps another
+/// [BaseClient] and adds the desired behavior:
+///
+///     class UserAgentClient extends http.BaseClient {
+///       final String userAgent;
+///       final HttpClient _inner;
+///
+///       UserAgentClient(this.userAgent, this._inner);
+///
+///       Future<StreamedResponse> send(BaseRequest request) {
+///         request.headers[HttpHeaders.USER_AGENT] = userAgent;
+///         return _inner.send(request);
+///       }
+///     }
+///
+/// In turn, libraries using [Client] should take a [BaseClient] so that the
+/// decorated clients can be used transparently.
+
+library http;
+
+import 'dart:scalarlist';
+import 'dart:uri';
+
+import 'src/client.dart';
+import 'src/response.dart';
+
+export 'src/base_client.dart';
+export 'src/base_request.dart';
+export 'src/base_response.dart';
+export 'src/client.dart';
+export 'src/request.dart';
+export 'src/response.dart';
+export 'src/streamed_request.dart';
+export 'src/streamed_response.dart';
+
+/// Sends an HTTP HEAD request with the given headers to the given URL, which
+/// can be a [Uri] or a [String].
+///
+/// This automatically initializes a new [Client] and closes that client once
+/// the request is complete. If you're planning on making multiple requests to
+/// the same server, you should use a single [Client] for all of those requests.
+///
+/// For more fine-grained control over the request, use [Request] instead.
+Future<Response> head(url, {Map<String, String> headers}) =>
+  _withClient((client) => client.head(url, headers: headers));
+
+/// Sends an HTTP GET request with the given headers to the given URL, which can
+/// be a [Uri] or a [String].
+///
+/// This automatically initializes a new [Client] and closes that client once
+/// the request is complete. If you're planning on making multiple requests to
+/// the same server, you should use a single [Client] for all of those requests.
+///
+/// For more fine-grained control over the request, use [Request] instead.
+Future<Response> get(url, {Map<String, String> headers}) =>
+  _withClient((client) => client.get(url, headers: headers));
+
+/// Sends an HTTP POST request with the given headers and fields to the given
+/// URL, which an be a [Uri] or a [String]. If any fields are specified, the
+/// content-type is automatically set to `"application/x-www-form-urlencoded"`.
+///
+/// This automatically initializes a new [Client] and closes that client once
+/// the request is complete. If you're planning on making multiple requests to
+/// the same server, you should use a single [Client] for all of those requests.
+///
+/// For more fine-grained control over the request, use [Request] or
+/// [StreamedRequest] instead.
+Future<Response> post(url,
+    {Map<String, String> headers,
+     Map<String, String> fields}) =>
+  _withClient((client) => client.post(url, headers: headers, fields: fields));
+
+/// Sends an HTTP POST request with the given headers and fields to the given
+/// URL, which can be a [Uri] or a [String]. If any fields are specified, the
+/// content-type is automatically set to `"application/x-www-form-urlencoded"`.
+///
+/// This automatically initializes a new [Client] and closes that client once
+/// the request is complete. If you're planning on making multiple requests to
+/// the same server, you should use a single [Client] for all of those requests.
+///
+/// For more fine-grained control over the request, use [Request] or
+/// [StreamedRequest] instead.
+Future<Response> put(url,
+    {Map<String, String> headers,
+     Map<String, String> fields}) =>
+  _withClient((client) => client.put(url, headers: headers, fields: fields));
+
+/// Sends an HTTP DELETE request with the given headers to the given URL, which
+/// can be a [Uri] or a [String].
+///
+/// This automatically initializes a new [Client] and closes that client once
+/// the request is complete. If you're planning on making multiple requests to
+/// the same server, you should use a single [Client] for all of those requests.
+///
+/// For more fine-grained control over the request, use [Request] instead.
+Future<Response> delete(url, {Map<String, String> headers}) =>
+  _withClient((client) => client.delete(url, headers: headers));
+
+/// Sends an HTTP GET request with the given headers to the given URL, which can
+/// be a [Uri] or a [String], and returns a Future that completes to the body of
+/// the response as a [String].
+///
+/// The Future will emit an [HttpException] if the response doesn't have a
+/// success status code.
+///
+/// This automatically initializes a new [Client] and closes that client once
+/// the request is complete. If you're planning on making multiple requests to
+/// the same server, you should use a single [Client] for all of those requests.
+///
+/// For more fine-grained control over the request and response, use [Request]
+/// instead.
+Future<String> read(url, {Map<String, String> headers}) =>
+  _withClient((client) => client.read(url, headers: headers));
+
+/// Sends an HTTP GET request with the given headers to the given URL, which can
+/// be a [Uri] or a [String], and returns a Future that completes to the body of
+/// the response as a list of bytes.
+///
+/// The Future will emit an [HttpException] if the response doesn't have a
+/// success status code.
+///
+/// This automatically initializes a new [Client] and closes that client once
+/// the request is complete. If you're planning on making multiple requests to
+/// the same server, you should use a single [Client] for all of those requests.
+///
+/// For more fine-grained control over the request and response, use [Request]
+/// instead.
+Future<Uint8List> readBytes(url, {Map<String, String> headers}) =>
+  _withClient((client) => client.readBytes(url, headers: headers));
+
+Future _withClient(Future fn(Client)) {
+  var client = new Client();
+  var future = fn(client);
+  future.onComplete((_) => client.close());
+  return future;
+}