rpc error: batch requests are disabled

[bap2pecs]

Problem

I was testing the quickstart and saw L2 tx went through in my Metamask. However, it doesn't show up in the explorer

Root cause analysis

I checked that my node config has:

[RPC]
...
MaxRequestsPerIPAndSecond = 5000
...

however, I still get this error:

zkevm-explorer-l2  | Retrying.
zkevm-explorer-l2  | 2024-01-16T07:04:06.434 application=indexer fetcher=block_catchup first_block_number=2 last_block_number=0 missing_block_count=3 shrunk=false [info] Index had to catch up.
zkevm-explorer-l2  | 2024-01-16T07:04:06.434 application=indexer fetcher=block_catchup [info] Checking if index needs to catch up in 2500ms.
zkevm-explorer-l2  | 2024-01-16T07:04:08.947 application=indexer fetcher=block_catchup first_block_number=2 last_block_number=0 [error] ** (EthereumJSONRPC.DecodeError) Failed to decode Ethereum JSONRPC response:
zkevm-explorer-l2  | 
zkevm-explorer-l2  |   request:
zkevm-explorer-l2  | 
zkevm-explorer-l2  |     url: http://zkevm-explorer-json-rpc:8124
zkevm-explorer-l2  | 
zkevm-explorer-l2  |     body: [{"id":0,"jsonrpc":"2.0","method":"eth_getBlockByNumber","params":["0x2",true]},{"id":1,"jsonrpc":"2.0","method":"eth_getBlockByNumber","params":["0x1",true]},{"id":2,"jsonrpc":"2.0","method":"eth_getBlockByNumber","params":["0x0",true]}]
zkevm-explorer-l2  | 
zkevm-explorer-l2  |   response:
zkevm-explorer-l2  | 
zkevm-explorer-l2  |     status code: 400
zkevm-explorer-l2  | 
zkevm-explorer-l2  |     body: batch requests are disabled
...

I can also curl to reproduce it and get "batch requests are disabled" response with:

curl -X POST -H "Content-Type: application/json" --data '[
  {
    "id": 0,
    "jsonrpc": "2.0",
    "method": "eth_getBlockByNumber",
    "params": ["0x2", true]
  },
  {
    "id": 1,
    "jsonrpc": "2.0",
    "method": "eth_getBlockByNumber",
    "params": ["0x1", true]
  },
  {
    "id": 2,
    "jsonrpc": "2.0",
    "method": "eth_getBlockByNumber",
    "params": ["0x0", true]
  }
]' http://localhost:8124

the RPC service is defined in the compose file as:

  zkevm-explorer-json-rpc:
    container_name: zkevm-explorer-json-rpc
    image: hermeznetwork/cdk-validium-node:v0.0.3-RC2
    ports:
      - 8124:8124
      - 8134:8134 # needed if WebSockets enabled
    environment:
      - ZKEVM_NODE_STATE_DB_HOST=zkevm-state-db
      - ZKEVM_NODE_POOL_DB_HOST=zkevm-pool-db
      - ZKEVM_NODE_RPC_PORT=8124
      - ZKEVM_NODE_RPC_WEBSOCKETS_PORT=8134
    volumes:
      - ./config/node/config.toml:/app/config.toml
      - ./config/node/genesis.config.json:/app/genesis.json
    command:
      - "/bin/sh"
      - "-c"
      - "/app/zkevm-node run --network custom --custom-network-file /app/genesis.json --cfg /app/config.toml --components rpc --http.api eth,net,debug,zkevm,txpool,web3"

which seems alright. so I don't know why I got this error. any ideas?

[bap2pecs]

it's now fixed after setting BatchRequestsEnabled