message: handle error for fetch
diff: @@ -232,7 +232,20 @@ export default class Matic {
  ])
  // fetch header object & header proof
  - const header = await this.getHeaderObject(txProof.blockNumber)
  + let header = null
  + try {
  + header = await this.getHeaderObject(txProof.blockNumber)
  + } catch (e) {
  + // ignore error
  + }
  +
  + // check if header block found
  + if (!header) {
  + throw new Error(
  + `No corresponding checkpoint/header block found for ${txId}.`
  + )
  + }
  +
  const headerProof = await this.getHeaderProof(txProof.blockNumber, header)
  const withdrawTx = this._rootChainContract.methods.withdraw(
  @@ -402,6 +415,11 @@ export default class Matic {
  },
  body: data.body ? JSON.stringify(data.body) : null,
  }).then(res => {
  + if (!res.ok) {
  + const err = new Error(res.statusText || 'Unknown error occurred')
  + err.response = res
  + throw err
  + }
  return res.json()
  })
  }
  