scripts/send-error-report: fetch /Errors/ instead of /.
If HTTP_PROXY or http_proxy is set when the send-error-report script
is run, it will check to see if fetching / on the specified server
returns 200 without the proxy set. If it does it will assume that the
proxy is not needed. However this check can never work because
fetching / always redirects to /Errors/ in the current code and
thus returns code 301. This is fixed by fetching /Errors/ instead of /.
