Ferron 3 change log

Stay updated with a Ferron 3 change log, featuring bug fixes, new features, and enhancements for each release.

Ferron 2 Ferron 2 LTS Ferron 1.x Ferron 3 (beta)

Ferron 3.0.0-beta.1

Released in May 5, 2026

Added

  • CLI utility for hashing passwords.
  • CLI utility for pre-compressing static files.
  • CLI utility for translating Ferron 2 configurations into Ferron 3 ones.
  • CLI utility for zero-configuration serving.

Changed

  • Non-existent webroots now lead to 404 Not Found errors instead of 500 Internal Server Error errors.

Fixed

  • Partial hostname resolution match in HTTP server could lead to incorrect routing.
  • Redirects configured with status directive didn’t have some placeholder locations (such as $1) replaced when using a regex match.
  • Redirects configured with status directive didn’t lead to any destination.
  • Reverse proxy was sometimes routed to wrong backend server.
  • Some default cache paths were unwritable in some cases.
  • Unknown directives in global blocks for status directive (even though they’re known in host blocks) caused the web server to fail to start.
  • When using OTLP, access logs were emitted with “access_log” body, not actual access logs.

Ferron 3.0.0-alpha.3

Released in April 23, 2026

Added

  • Multiple DNS providers for DNS-01 ACME challenge.
  • Support for CGI (Common Gateway Interface).
  • Support for FastCGI (including PHP-FPM).
  • Support for forwarded authentication.
  • Support for SCGI (Simple Common Gateway Interface).

Fixed

  • Connections to HTTP/2 backends in reverse proxy were aborted.
  • Error interception configuration blocks weren’t applied properly.
  • HTTP to HTTPS redirect wasn’t enabled by default.
  • HTTP upgrades weren’t performed properly.
  • HTTP-01 ACME challenge failed due to challenge not being served for implicit automatic TLS.
  • On-demand automatic TLS wasn’t functioning correctly.
  • Some ACME events were logged only to the console, not observability backends.
  • TLS certificates with local CA weren’t checked if they’re expired.

Ferron 3.0.0-alpha.2

Released in April 17, 2026

Added

  • Active health checking in reverse proxy support.
  • Automatic TLS with local certificate authority (CA).
  • Experimental HTTP/3 support.
  • map directive for mapping variables.
  • Prometheus metrics export support.
  • Response body string replacement support.
  • Support for body interpolation in status directives.
  • Support for interpolated strings in header values.
  • W3C Trace Context (traceparent and tracestate) propagation and generation.

Changed

  • Improved the request URL normalization.
  • Requests with multiple Host headers are now rejected.

Fixed

  • PROXY protocol setting, connection retry setting and error interception weren’t working for reverse proxy.
  • Zerocopy static file serving wasn’t working properly on Linux, because it wasn’t enabled.

Ferron 3.0.0-alpha.1

Released in April 10, 2026

Changed

  • First alpha release of Ferron 3.