dart-lang#184

Remove charset from "Content-Type" header

Now the null value will be reflected for the charset in the header.

lib/src/base_client.dart

@@ -152,24 +152,27 @@ abstract class BaseClient implements Client {
     if (url is String) url = Uri.parse(url);
     var request = new Request(method, url);
 
-    if (headers != null) request.headers.addAll(headers);
-   if(encoding != null) request.encoding = encoding; else {
-     request.isIgnoreEncoding = true;
-   }
-      if (body != null) {
-        if (body is String) {
-          request.body = body;
-        } else if (body is List) {
-          request.bodyBytes = body.cast<int>();
-        } else if (body is Map) {
-          request.bodyFields = body.cast<String, String>();
-        } else {
-          throw new ArgumentError('Invalid request body "$body".');
-        }
+    if (headers != null) {
+      request.headers.addAll(headers);
+    }
+    if (encoding != null) {
+      request.encoding = encoding;
+    } else {
+      request.isIgnoreEncoding = true;
+    }
+    if (body != null) {
+      if (body is String) {
+        request.body = body;
+      } else if (body is List) {
+        request.bodyBytes = body.cast<int>();
+      } else if (body is Map) {
+        request.bodyFields = body.cast<String, String>();
+      } else {
+        throw new ArgumentError('Invalid request body "$body".');
       }
+    }
 
-      return Response.fromStream(await send(request));
-
+    return Response.fromStream(await send(request));
   }
 
   /// Throws an error if [response] is not successful.

lib/src/request.dart

@@ -58,10 +58,11 @@ class Request extends BaseRequest {
     _defaultEncoding = value;
     var contentType = _contentType;
     if (contentType == null) return;
-    if (isIgnoreEncoding)
+    if (isIgnoreEncoding) {
       _contentType = contentType.change(parameters: {});
-    else
+    } else {
       _contentType = contentType.change(parameters: {'charset': value.name});
+    }
   }
 
   // TODO(nweiz): make this return a read-only view