Add the ability to configure the max connections to a host. (#790)

Author: brianquinlan

pkgs/cupertino_http/CHANGELOG.md

@@ -1,3 +1,8 @@
+## 0.0.6
+
+* Make the number of simulateous connections allowed to the same host
+  configurable.
+
 ## 0.0.5
 
 * Add the ability to set network service type.

pkgs/cupertino_http/example/integration_test/url_session_configuration_test.dart

@@ -42,6 +42,12 @@ void testProperties(URLSessionConfiguration config) {
       expect(config.httpCookieAcceptPolicy,
           HTTPCookieAcceptPolicy.httpCookieAcceptPolicyNever);
     });
+    test('httpMaximumConnectionsPerHost', () {
+      config.httpMaximumConnectionsPerHost = 6;
+      expect(config.httpMaximumConnectionsPerHost, 6);
+      config.httpMaximumConnectionsPerHost = 23;
+      expect(config.httpMaximumConnectionsPerHost, 23);
+    });
     test('httpShouldSetCookies', () {
       config.httpShouldSetCookies = true;
       expect(config.httpShouldSetCookies, true);

pkgs/cupertino_http/lib/cupertino_http.dart

@@ -214,6 +214,15 @@ class URLSessionConfiguration
   set httpCookieAcceptPolicy(HTTPCookieAcceptPolicy value) =>
       _nsObject.HTTPCookieAcceptPolicy = value.index;
 
+  // The maximun number of connections that a URLSession can have open to the
+  // same host.
+  //
+  // See [NSURLSessionConfiguration.HTTPMaximumConnectionsPerHost](https://developer.apple.com/documentation/foundation/nsurlsessionconfiguration/1407597-httpmaximumconnectionsperhost).
+  int get httpMaximumConnectionsPerHost =>
+      _nsObject.HTTPMaximumConnectionsPerHost;
+  set httpMaximumConnectionsPerHost(int value) =>
+      _nsObject.HTTPMaximumConnectionsPerHost = value;
+
   /// Whether requests should include cookies from the cookie store.
   ///
   /// See [NSURLSessionConfiguration.HTTPShouldSetCookies](https://developer.apple.com/documentation/foundation/nsurlsessionconfiguration/1411589-httpshouldsetcookies)
@@ -296,6 +305,7 @@ class URLSessionConfiguration
       'discretionary=$discretionary '
       'httpCookieAcceptPolicy=$httpCookieAcceptPolicy '
       'httpShouldSetCookies=$httpShouldSetCookies '
+      'httpMaximumConnectionsPerHost=$httpMaximumConnectionsPerHost '
       'httpShouldUsePipelining=$httpShouldUsePipelining '
       'requestCachePolicy=$requestCachePolicy '
       'sessionSendsLaunchEvents=$sessionSendsLaunchEvents '

pkgs/cupertino_http/pubspec.yaml

@@ -2,7 +2,7 @@ name: cupertino_http
 description: >
   A macOS/iOS Flutter plugin that provides access to the Foundation URL
   Loading System.
-version: 0.0.5
+version: 0.0.6
 repository: https://github.com/dart-lang/http/tree/master/pkgs/cupertino_http
 
 environment: