struct OP_REPLY { MsgHeader header; // standard message header int32 responseFlags; // bit vector - see details below int64 cursorID; // cursor id if client needs to do get more's int32 startingFrom; // where in the cursor this reply is starting int32 numberReturned; // number of documents in the reply document* documents; // documents } Response Flags: %0%: *CursorNotFound*: getMore: ~Cursor ID~ not valid %1%: *QueryFailure*: Is set when query failed. %2%: *ShardConfigStale*: mongos only: is set, it needs to update config from the server. %3%: *AwaitCapable*: Always set. %4-31%: *Reserved*