don't always send 500 if couldn't get request
don't always send 500 if couldn't get request

No need to send 500 if connection closed. We may want to send other
responses in other cases (e.g., 400).

Signed-off-by: Yehuda Sadeh <48638f9c2a62c4fd20be28d0bdad68f5cd041402@redhat.com>

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