Expose full response headers object

Summary

It is now possible to get the entire response headers object from the query/insert/command/exec methods. With query, you can access the ResultSet.response_headers property; other methods (insert/command/exec) return it as parts of their response objects as well.

For example:

  const rs = await client.query({
    query: 'SELECT * FROM system.numbers LIMIT 1',
    format: 'JSONEachRow',
  })
  console.log(rs.response_headers['content-type'])

This will print: application/x-ndjson; charset=UTF-8. It can be used in a similar way with the other methods.

Checklist

[x] Unit and integration tests covering the common scenarios were added
[x] A human-readable description of the changes was provided to include in CHANGELOG
[ ] For significant changes, documentation in https://github.com/ClickHouse/clickhouse-docs was updated with further explanations or tutorials

ClickHouse / clickhouse-js

Expose full response headers object #288

Summary

Checklist

Quality Gate passed