Fix a failing test

[tsuzu]

While I'm executing tests, I've got an error like:

=== RUN   TestLoaderHTTPMalformedURL
    fileloader_test.go:689: 
        	Error Trace:	/home/runner/work/kustomize/kustomize/api/internal/loader/fileloader_test.go:689
        	Error:      	Not equal: 
        	            	expected: "HTTP Error: status code 500 (Internal Server Error)"
        	            	actual  : "HTTP Error: status code 400 (Bad Request)"
        	            	
        	            	Diff:
        	            	--- Expected
        	            	+++ Actual
        	            	@@ -1 +1 @@
        	            	-HTTP Error: status code 500 (Internal Server Error)
        	            	+HTTP Error: status code 400 (Bad Request)
        	Test:       	TestLoaderHTTPMalformedURL

I'm not sure why is's caused, but it would be due to example.com-side changes.

[k8s-ci-robot]

Skipping CI for Draft Pull Request.
If you want CI signal for your change, please convert it to an actual PR.
You can still manually trigger a test run with /test all

[tsuzu]

/kind bug

[TerryHowe]

The 400 response makes more sense although this shouldn't really hit example.com

[koba1t]

It seems to reproduce on the master branch.
I agree with the opinion that this error is caused by changes on the part of example.com.
Thank you!

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: koba1t, TerryHowe, tsuzu

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