Module @helia/block-brokers

Example: Customizing fetch requests with custom headers

It is possible to modify outgoing requests to (for example) include authentication information (such as a JWT token in a header).

import { createHelia } from 'helia'
import { trustlessGateway } from '@helia/block-brokers'
import { unixfs } from '@helia/unixfs'
import { CID } from 'multiformats/cid'
import { concat } from 'uint8arrays/concat'
import all from 'it-all'

const helia = await createHelia({
  blockBrokers: [
    trustlessGateway({
      transformRequestInit: (requestInit) => {
        // modify the request init object as required
        requestInit.headers = {
          ...requestInit.headers,
          'User-Agent': 'Helia Example Script'
        }
        return requestInit
      }
    })
  ]
})

const cid = CID.parse('bafkreife2klsil6kaxqhvmhgldpsvk5yutzm4i5bgjoq6fydefwtihnesa')
const fs = unixfs(helia)

for await (const chunk of fs.cat(cid, {
  signal: AbortSignal.timeout(10_000)
})) {
  console.info(chunk)
}
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