I get a "Bad Request" error when making an HTTP GET request

I get a "Bad Request" error when making an HTTP GET request

I tried to make two GET requests in the 'HTTP Request' module, setting up the flow as described in the exercise 4A and 4B in the fundamentals course (session 5 slides 8 and 9), but got an error:
Could not download flow assemblies (727f83ba-352e-88e3-0109-72efd96e9cc2) - Bad Request
The URLs seem to work, here they are:

What could be the problem?

Update: attached screenshots of my flow settings and the error.