Operation returned an invalid status code 'BadRequest'

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Version

Latest v4 SDK

Describe the bug

I am using a simple Adaptive Card to display an image using base64 encoded image value. It works fine on my local workstation with Bot Emulator. When I deploy this to Azure App Service I get an error.

To Reproduce

Here’s my JSON with shorted base64. For full JSON and original image see attachment.

{
  "type": "AdaptiveCard",
  "$schema": "http://adaptivecards.io/schemas/adaptive-card.json",
  "version": "1.0",
  "body": [
    {
      "type": "Image",
      "url": "data:image/png;base64,iVBORw0KGgoAAAANS....ggg=="
    }
  ]
}

On Azure I get the following error:

Microsoft.Bot.Schema.ErrorResponseException: Operation returned an invalid status code 'BadRequest'
  at Microsoft.Bot.Connector.Conversations.ReplyToActivityWithHttpMessagesAsync(String conversationId, String activityId, Activity activity, Dictionary`2 customHeaders, CancellationToken cancellationToken)
  at Microsoft.Bot.Connector.ConversationsExtensions.ReplyToActivityAsync(IConversations operations, String conversationId, String activityId, Activity activity, CancellationToken cancellationToken)
  at Microsoft.Bot.Builder.BotFrameworkAdapter.SendActivitiesAsync(ITurnContext turnContext, Activity[] activities, CancellationToken cancellationToken)at Microsoft.Bot.Builder.TurnContext.<>c__DisplayClass22_0.<<SendActivitiesAsync>g__SendActivitiesThroughAdapter|1>d.MoveNext()

Expected behavior

Image is displayed

Screenshots

If applicable, add screenshots to help explain your problem.

Additional context

If I try to dispay image via URL it works just fine.

[bug]

[fknince]

I fixed same problem with removing empty contents in my json text.

[jnair7291]

@exdunn thank you so much bro…this actually saved my time debugging the entire code