ServiceError with basic Direct Line interaction

Question

I've got a basic bot that I am trying to interact with via Direct Line. Following this example, these are what my requests look like:

Start Conversation

Send Activity

The error it responds with is difficult to investigate with such minimal information. The bot itself is working perfectly on other channels.

Has anyone seen this before?

Answer 1

Apologies for answering my own question. It turns out, the Send Activity request was sent as application/text instead of application/json.

I wish the error was more clear on why it was rejecting it but that fixed my issue.