HTTPX 1.8.0 for Ruby introduces several new plugins and features: a `:server_sent_events` plugin for handling text/event-stream responses, a `:cache` plugin extracted from the existing `:response_cache` plugin, and a `:ntlm_v2_auth` plugin for Microsoft NTLM v2 authentication. New timeout options include `:total_request_timeout` (covering redirects and retries) and `:ping_timeout` for connection liveness probing. The `:ssrf_filter` plugin gains options for custom unsafe and safe IP ranges. The `:auth` plugin adds token expiry options (`:reset_auth_header_expires_in/at`) used by the `:oauth` plugin for proactive token refresh. New response limits include `:max_response_body_size`, `:max_response_headers`, and `:max_response_header_value_size`. DNS resolver file caching enables cross-process DNS entry sharing. Bug fixes address fiber scheduler compatibility in Ruby 4, proxy auth encoding, retry backoff calculations, tracing span timing, and Datadog gem v2.34+ integration.
