mixed: HTTP 200; incomplete; resolved=2/3
all_found: HTTP 200; resolved; resolved=3/3
missing: HTTP 200; invalid_batch; resolved=0/3
duplicate: HTTP 200; invalid_batch; resolved=0/3
unknown: HTTP 200; invalid_batch; resolved=0/3
outer_failure: HTTP 503; invalid_batch; resolved=0/3
PASS: 6 loopback batches; item identity, status and completeness checked; no retries
