[MET-3] Added 404 test case
[MET-3] Implemented multi retrieve feature
[MET-3] Added error, code 002
[MET-3] Shortened log messages
[MET-3] Changed error code for multi + shortened log messages
[MET-3] Typo
[MET-4] Added perf test script (mono case)
[MET-3] Q&D web client (WIP)
[MET-3] Q&D web client (WIP)