ASP.NET+Azure 400 Bad Request doesn't return JSON data

Question

There is an action in my ASP.NET MVC controller that returns JSON data with a 400 Bad Request when invalid parameters are passed to the action.

[HttpDelete]
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Answer 1

Add the following entry to your 'web.config'.

<system.webServer>
  <httpErrors existingResponse="PassThrough"/>
</system.webServer>

This will allow HTTP errors to pass through un-molested.