●Change8

Migrating to HAProxy v3.4-dev8

Version v3.4-dev8 introduces 1 breaking change. This guide details how to update your code.

Released: 4/3/2026

1
Breaking Changes
1
Migration Steps
38
Affected Symbols

⚠️ Check Your Code

If you use any of these symbols, you need to read this guide:

log.do_loglog.do_log_ctxsock.accept()qpackschedmux-h2acme_x509_req()http_htxbuffersquicdynbufconfightxhtx_xfer_blkshtx_xferhttp-anachunkstreamstconntcpcheckproxyssl/clissl/ocspmap/climux-h1http_actstatsbackendsserversssl/lognet_helperresolversacmegit-show-backportscheckconnectionsserverprotocols

Breaking Changes

●Issue #1

The `htx_xfer_blks()` function has been replaced by `htx_xfer()`. Code using `htx_xfer_blks()` will need to be updated to use the new function.

Migration Steps

  1. 1
    Update code that uses `htx_xfer_blks()` to use `htx_xfer()` instead.

Release Summary

This release introduces significant improvements to logging, scheduling, and buffer management, alongside numerous bug fixes and new features for ACME, HTTP actions, and TCP checks. Key changes include the split of logging functions, enhanced scheduler behavior, and the introduction of small buffer support across various modules.

Need More Details?

View the full release notes and all changes for HAProxy v3.4-dev8.

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