add headers for NetworkImage

example/lib/main.dart

@@ -146,6 +146,7 @@ class _MyHomePageState extends State<MyHomePage> {
       body: SingleChildScrollView(
         child: Html(
           data: htmlData,
+          imageHeaders: {"cookie": "kkk"},
           //Optional parameters:
           style: {
             "html": Style(

lib/flutter_html.dart

@@ -34,6 +34,7 @@ class Html extends StatelessWidget {
   Html({
     Key key,
     @required this.data,
+    this.imageHeaders,
     this.onLinkTap,
     this.customRender,
     this.onImageError,
@@ -45,6 +46,7 @@ class Html extends StatelessWidget {
   }) : super(key: key);
 
   final String data;
+  final Map<String, String> imageHeaders;
   final OnTap onLinkTap;
   final ImageErrorListener onImageError;
   final bool shrinkWrap;
@@ -74,6 +76,7 @@ class Html extends StatelessWidget {
       width: width,
       child: HtmlParser(
         htmlData: data,
+        imageHeaders: imageHeaders,
         onLinkTap: onLinkTap,
         onImageTap: onImageTap,
         onImageError: onImageError,

lib/html_parser.dart

@@ -24,6 +24,7 @@ typedef CustomRender = Widget Function(
 
 class HtmlParser extends StatelessWidget {
   final String htmlData;
+  final Map<String, String> imageHeaders;
   final OnTap onLinkTap;
   final OnTap onImageTap;
   final ImageErrorListener onImageError;
@@ -36,6 +37,7 @@ class HtmlParser extends StatelessWidget {
 
   HtmlParser({
     @required this.htmlData,
+    this.imageHeaders,
     this.onLinkTap,
     this.onImageTap,
     this.onImageError,
@@ -54,6 +56,7 @@ class HtmlParser extends StatelessWidget {
       customRender?.keys?.toList() ?? [],
       blacklistedElements,
       navigationDelegateForIframe,
+      imageHeaders
     );
     StyledElement styledTree = applyCSS(lexedTree);
     StyledElement inlineStyledTree = applyInlineStyles(styledTree);
@@ -96,11 +99,13 @@ class HtmlParser extends StatelessWidget {
     List<String> customRenderTags,
     List<String> blacklistedElements,
     NavigationDelegate navigationDelegateForIframe,
+      Map<String,String> header
   ) {
     StyledElement tree = StyledElement(
       name: "[Tree Root]",
       children: new List<StyledElement>(),
       node: html.documentElement,
+      map: header
     );
 
     html.nodes.forEach((node) {
@@ -109,6 +114,7 @@ class HtmlParser extends StatelessWidget {
         customRenderTags,
         blacklistedElements,
         navigationDelegateForIframe,
+        header
       ));
     });
 
@@ -124,6 +130,7 @@ class HtmlParser extends StatelessWidget {
     List<String> customRenderTags,
     List<String> blacklistedElements,
     NavigationDelegate navigationDelegateForIframe,
+    Map <String,String>header
   ) {
     List<StyledElement> children = List<StyledElement>();
 
@@ -133,6 +140,7 @@ class HtmlParser extends StatelessWidget {
         customRenderTags,
         blacklistedElements,
         navigationDelegateForIframe,
+        header
       ));
     });
 
@@ -146,7 +154,7 @@ class HtmlParser extends StatelessWidget {
       } else if (INTERACTABLE_ELEMENTS.contains(node.localName)) {
         return parseInteractableElement(node, children);
       } else if (REPLACED_ELEMENTS.contains(node.localName)) {
-        return parseReplacedElement(node, navigationDelegateForIframe);
+        return parseReplacedElement(node, navigationDelegateForIframe, header);
       } else if (LAYOUT_ELEMENTS.contains(node.localName)) {
         return parseLayoutElement(node, children);
       } else if (TABLE_CELL_ELEMENTS.contains(node.localName)) {

lib/src/replaced_element.dart

@@ -64,11 +64,13 @@ class TextContentElement extends ReplacedElement {
 /// https://developer.mozilla.org/en-US/docs/Web/HTML/Element/img
 class ImageContentElement extends ReplacedElement {
   final String src;
+  final Map<String, String> imageHeaders;
   final String alt;
 
   ImageContentElement({
     String name,
     Style style,
+    this.imageHeaders,
     this.src,
     this.alt,
     dom.Element node,
@@ -122,14 +124,15 @@ class ImageContentElement extends ReplacedElement {
       );
     } else {
       precacheImage(
-        NetworkImage(src),
+        NetworkImage(src, headers: imageHeaders),
         context.buildContext,
         onError: (exception, StackTrace stackTrace) {
           context.parser.onImageError?.call(exception, stackTrace);
         },
       );
       Completer<Size> completer = Completer();
-      Image image = Image.network(src, frameBuilder: (ctx, child, frame, _) {
+      Image image = Image.network(src, headers: imageHeaders,
+          frameBuilder: (ctx, child, frame, _) {
         if (frame == null) {
           completer.completeError("error");
           return child;
@@ -138,26 +141,27 @@ class ImageContentElement extends ReplacedElement {
         }
       });
       image.image.resolve(ImageConfiguration()).addListener(
-        ImageStreamListener(
-              (ImageInfo image, bool synchronousCall) {
-            var myImage = image.image;
-            Size size = Size(myImage.width.toDouble(), myImage.height.toDouble());
-            completer.complete(size);
-          }, onError: (object, stacktrace) {
-            completer.completeError(object);
-          }
-        ),
-      );
+            ImageStreamListener((ImageInfo image, bool synchronousCall) {
+              var myImage = image.image;
+              Size size =
+                  Size(myImage.width.toDouble(), myImage.height.toDouble());
+              completer.complete(size);
+            }, onError: (object, stacktrace) {
+              completer.completeError(object);
+            }),
+          );
       imageWidget = FutureBuilder<Size>(
         future: completer.future,
         builder: (BuildContext buildContext, AsyncSnapshot<Size> snapshot) {
           if (snapshot.hasData) {
             return new Image.network(
               src,
+              headers: imageHeaders,
               width: snapshot.data.width,
               frameBuilder: (ctx, child, frame, _) {
                 if (frame == null) {
-                  return Text(alt ?? "", style: context.style.generateTextStyle());
+                  return Text(alt ?? "",
+                      style: context.style.generateTextStyle());
                 }
                 return child;
               },
@@ -392,9 +396,9 @@ class RubyElement extends ReplacedElement {
 }
 
 ReplacedElement parseReplacedElement(
-  dom.Element element,
-  NavigationDelegate navigationDelegateForIframe,
-) {
+    dom.Element element,
+    NavigationDelegate navigationDelegateForIframe,
+    Map<String, String> imageHeaders) {
   switch (element.localName) {
     case "audio":
       final sources = <String>[
@@ -426,6 +430,7 @@ ReplacedElement parseReplacedElement(
     case "img":
       return ImageContentElement(
         name: "img",
+        imageHeaders: imageHeaders,
         src: element.attributes['src'],
         alt: element.attributes['alt'],
         node: element,

lib/src/styled_element.dart

@@ -20,6 +20,7 @@ class StyledElement {
     this.children,
     this.style,
     dom.Element node,
+    Map<String ,String> map,
   }) : this._node = node;
 
   bool matchesSelector(String selector) =>

pubspec.yaml

@@ -20,7 +20,7 @@ dependencies:
 
   # Plugins for rendering the <video> tag.
   video_player: ^1.0.1
-  chewie: ^0.12.0
+  chewie: ^0.12.1
 
   # Plugin for rendering the <iframe> tag.
   webview_flutter: ^1.0.0

test/html_parser_test.dart

@@ -34,6 +34,7 @@ void testNewParser() {
       [],
       [],
       null,
+      null,
     );
     print(tree.toString());
   });
@@ -44,6 +45,7 @@ void testNewParser() {
             "Hello, World! <a href='https://example.com'>This is a link</a>"),
         [],
         [],
+        null,
         null);
     print(tree.toString());
   });
@@ -54,6 +56,7 @@ void testNewParser() {
       [],
       [],
       null,
+      null
     );
     print(tree.toString());
   });
@@ -65,6 +68,7 @@ void testNewParser() {
       [],
       [],
       null,
+      null
     );
     print(tree.toString());
   });
@@ -78,7 +82,7 @@ void testNewParser() {
        Your browser does not support the video tag.
       </video>
     """).getElementsByTagName("video")[0],
-      null,
+      null, null
     );
 
     expect(videoContentElement, isA<VideoContentElement>());
@@ -98,7 +102,7 @@ void testNewParser() {
         <source src='audio.wav' type='audio/wav'>
         Your browser does not support the audio tag.
       </audio>
-    """).getElementsByTagName("audio")[0],
+    """).getElementsByTagName("audio")[0], null,
       null,
     );
     expect(audioContentElement, isA<AudioContentElement>());