It's not possible to send binary data with the HttpSend activity

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Version

Latest

Describe the bug

It’s not possible to send binary data with the HttpSend activity

To Reproduce

Steps to reproduce the behavior:

1. Add a property to assign a binary value using an expression. You can use base64ToBinary as an example =base64ToBinary("<base 64 string>")
2. Add a http send activity, try to use the above property in the body (using an expression) e.g. =dialog.myBinaryData
3. Observe the output, you will see that it just posts the value Byte[].

Its because its converting the data to string content before posting here

https://github.com/microsoft/botbuilder-dotnet/blob/main/libraries/Microsoft.Bot.Builder.Dialogs.Adaptive/Actions/HttpRequest.cs#L296

Expected behavior

It should allow you to post binary content.

[stevkan]

@jamesemann - Thank you for your patience. I was able to repro the issue you are encountering. I’ve been testing the above and have found that the values do appear to be in the created object. If you pass in an index value like dialog.myBinaryData[0], it will return a value for that index location. You could convert myBinaryData to an array using something like subArray, which works, but then it is no longer a binary array which I’m guessing you want for the HttpSend action.

In the meantime, I need to test a few more scenarios and then connect with one of the devs on this. I will keep you posted when I know more. Based on the above info, if you should find a workaround, please let me know.

[stevkan]

@jamesemann - Thank you for reporting this. I’ll investigate and let you know what I find.