Fixed problem in proxy_test with to specific error condition check.
Fixed problem in proxy_test with to specific error condition check.

- Actual error message depends on curl version

pixelated/pixelated-dispatcher,pixelated-project/pixelated-dispatcher,pixelated-project/pixelated-dispatcher,pixelated/pixelated-dispatcher,pixelated/pixelated-dispatcher,pixelated-project/pixelated-dispatcher