curl_easy_recv calls Curl_read which calls Curl_read_plain.
curl_easy_recv only assumes an error occurred if Curl_read returns -1.
Curl_read (and Curl_read_plain) can return CURLE_RECV_ERROR (56). That
error code gets returned to curl_easy_recv which only checks for -1 and
thus thinks there's no error.

This is in the latest 7.19.4 source
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