Fix #104 Support for setting HTTP headers

examples/widgets/http_post.dart

@@ -2,6 +2,8 @@
 // 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.
 
+import 'dart:async';
+
 import 'package:flutter/http.dart' as http;
 import 'package:flutter/material.dart';
 
@@ -30,15 +32,18 @@ class PostDemoState extends State<PostDemo> {
     super.initState();
   }
 
-  void _refresh() {
+  Future _refresh() async {
     setState(() {
       _response = null;
     });
-    http.post("http://httpbin.org/post", body: "asdf=42").then((http.Response response) {
+    http.Response response = await http.post(
+      "http://httpbin.org/post",
+      body: "asdf=42",
+      headers: { "foo": "bar" }
+    );
     setState(() {
       _response = response.body;
     });
-    });
   }
 
   Widget build(BuildContext context)  {

packages/flutter/lib/src/http/http.dart

@@ -29,15 +29,16 @@ Future<Response> head(url) =>
 /// 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.
-Future<Response> get(url) =>
-  _withClient((client) => client.get(url));
+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 body to the given URL,
 /// which can be a [Uri] or a [String].
 ///
 /// [body] sets the body of the request.
-Future<Response> post(url, {body}) =>
-  _withClient((client) => client.post(url, body: body));
+Future<Response> post(url, {Map<String, String> headers, body}) =>
+  _withClient((client) => client.post(url,
+      headers: headers, body: body));
 
 /// Sends an HTTP PUT request with the given headers and body to the given URL,
 /// which can be a [Uri] or a [String].
@@ -46,8 +47,9 @@ Future<Response> post(url, {body}) =>
 /// a [Map<String, String>]. If it's a String, it's encoded using [encoding] and
 /// used as the body of the request. The content-type of the request will
 /// default to "text/plain".
-Future<Response> put(url, {String body}) =>
-  _withClient((client) => client.put(url, body: body));
+Future<Response> put(url, {Map<String, String> headers, body}) =>
+  _withClient((client) => client.put(url,
+      headers: headers, body: body));
 
 /// Sends an HTTP PATCH request with the given headers and body to the given
 /// URL, which can be a [Uri] or a [String].
@@ -68,8 +70,9 @@ Future<Response> put(url, {String body}) =>
 ///
 /// For more fine-grained control over the request, use [Request] or
 /// [StreamedRequest] instead.
-Future<Response> patch(url, { body }) =>
-  _withClient((client) => client.patch(url, body: body));
+Future<Response> patch(url, {Map<String, String> headers, body}) =>
+  _withClient((client) => client.patch(url,
+      headers: headers, body: body));
 
 /// Sends an HTTP DELETE request with the given headers to the given URL, which
 /// can be a [Uri] or a [String].
@@ -79,8 +82,8 @@ Future<Response> patch(url, { body }) =>
 /// 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) =>
-  _withClient((client) => client.delete(url));
+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
@@ -95,8 +98,8 @@ Future<Response> delete(url) =>
 ///
 /// For more fine-grained control over the request and response, use [Request]
 /// instead.
-Future<String> read(url) =>
-  _withClient((client) => client.read(url));
+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
@@ -111,8 +114,8 @@ Future<String> read(url) =>
 ///
 /// For more fine-grained control over the request and response, use [Request]
 /// instead.
-Future<Uint8List> readBytes(url) =>
-  _withClient((client) => client.readBytes(url));
+Future<Uint8List> readBytes(url, {Map<String, String> headers}) =>
+  _withClient((client) => client.readBytes(url, headers: headers));
 
 Future _withClient(Future fn(MojoClient client)) {
   var client = new MojoClient();

packages/flutter/lib/src/http/mojo_client.dart

@@ -12,6 +12,7 @@ import 'package:mojo_services/mojo/url_loader.mojom.dart' as mojo;
 import 'package:mojo/core.dart' as mojo;
 import 'package:mojo/mojo/url_request.mojom.dart' as mojo;
 import 'package:mojo/mojo/url_response.mojom.dart' as mojo;
+import 'package:mojo/mojo/http_header.mojom.dart' as mojo;
 
 import 'response.dart';
 
@@ -63,10 +64,17 @@ class MojoClient {
 
   Future<Response> _send(String method, url,
       Map<String, String> headers, [body, Encoding encoding]) async {
-
     mojo.UrlLoaderProxy loader = new mojo.UrlLoaderProxy.unbound();
+    List<mojo.HttpHeader> mojoHeaders = <mojo.HttpHeader>[];
+    headers.forEach((String name, String value) {
+      mojo.HttpHeader header = new mojo.HttpHeader()
+        ..name = name
+        ..value = value;
+      mojoHeaders.add(header);
+    });
     mojo.UrlRequest request = new mojo.UrlRequest()
       ..url = url.toString()
+      ..headers = mojoHeaders
       ..method = method;
     if (body != null) {
       mojo.MojoDataPipe pipe = new mojo.MojoDataPipe();