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v2.0.0-rc10

vercel-labs/agent-browserv2.0.0-rc10Dec 22, 2025by qdm12

AI Summary

This Release Candidate introduces connection pooling for DNS over TLS, adds a health server endpoint, and enhances logging for debugging. It includes several fixes regarding local TLDs, logging verbosity, and IPv6 handling on Windows.

Key Highlights

  • DNS over TLS now uses a pool of connections to re-use TCP connections when possible
  • New `HEALTH_SERVER_ADDRESS` option defaults to 127.0.0.1:9999
  • New `REBINDING_PROTECTION_EXEMPT_HOSTNAMES` configuration option
  • Middleware logging now includes reasons for blocked elements
  • Grafana dashboard updated to schema version 3

Breaking Changes

  • `pkg/nameserver::GetDNSServers` no longer returns localhost IPs if no nameserver is found
  • `pkg/nameserver::GetDNSServers` now returns an eventual error
  • `pkg/nameserver::GetDNSServers` returns `[]netip.Addr` instead of `[]netip.AddrPort`

New Features

  • DNS over TLS connection pooling
  • Health server address configuration
  • Rebinding protection exemption option
  • Middleware logging for blocked elements

Full Release Notes

## Features

- DNS over TLS now uses a pool of connections to re-use TCP connections when possible (#150)
- `HEALTH_SERVER_ADDRESS` option, defaulting to `127.0.0.1:9999`
- by default log i/o timeout errors are logged at debug level because these are fairly common
- `REBINDING_PROTECTION_EXEMPT_HOSTNAMES` option
- `pkg/middlewares/filter`: log blocked elements with a reason

## Fixes

- `internal/local`: "site" and "network" TLDs are public, not local
- `pkg/middlewares/localdns`:
  - do not log request twice on errors
  - do not debug log NXDOMAIN coded responses since these happen often especially with search domains
- `internal/support/ipv6`: handle Windows error message
- Grafana dashboard plain DNS section updated

## Go API breaking changes

- `pkg/nameserver`: `GetDNSServers`
  - does not return localhost IPs if no nameserver is found 
  - returns an eventual error
  - returns []netip.Addr instead of []netip.AddrPort since it can only be an ip address without port

## Maintenance

- Grafana JSON dashboard upgraded to newer schema version 3
- Fix documentation URLs and CI links check
- bump markdownlint from v11 to v21