How-to send HTTP message to Bing Image Search API?

问题:

Try to use Bing Image Search API, like how-to explained here. But I get an error.

Parameter: Query is not of type String Any idea?

howto:

me: (in the popup both for username and password I set the Primary Account Key) Tried without %27, ay you see I did not set any header field, hopefully it is not problem.