缓存代理Varnish 4.0.1发布。2014-06-25 上个版本是2014-04-10的4.0.0，这是4.0第一个补丁版。代理现在国内主流基本是Squid,Varnish,Apache Traffic server三种。

完全改进：

Changes from 4.0.0 to 4.0.1 (2014-06-24)

New since 4.0.0:

• New functions in vmod_std: real2time, time2integer, time2real, real.

• Chunked requests are now supported. (pass)

• Add std.querysort() that sorts GET query arguments. (from libvmod-boltsort)

• Varnish will no longer reply with "200 Not Modified".

• Backend IMS is now only attempted when last status was 200.

• Packaging now uses find-provides instead of find-requires. [redhat]

• Two new counters: n_purges and n_obj_purged.

• Core size can now be set from /etc/sysconfig/varnish [redhat]

• Via header set is now RFC compliant.

• Removed "purge" keyword in VCL. Use return(purge) instead.

• fallback director is now documented.

• %D format flag in varnishncsa is now truncated to an integer value.

• persistent storage backend is now deprecated. https://www.varnish-cache.org/docs/trunk/phk/persistent.html

• Added format flags %I (total bytes received) and %O (total bytes sent) for varnishncsa.

• python-docutils >= 0.6 is now required.

• Support year (y) as a duration in VCL.

• VMOD ABI requirements are relaxed, a VMOD no longer have to be run on the same git revision as it was compiled for. Replaced by a major/minor ABI counter.

Bugs fixed

• 1269 - Use correct byte counters in varnishncsa when piping a request.

• 1524 - Chunked requests should be pipe-able.

• 1530 - Expire old object on successful IMS fetch.

• 1475 - time-to-first-byte in varnishncsa was potentially dishonest.

• 1480 - Porting guide for 4.0 is incomplete.

• 1482 - Inherit group memberships of -u specified user.

• 1473 - Fail correctly in configure when rst2man is not found.

• 1486 - Truncate negative Age values to zero.

• 1488 - Don't panic on high request rates.

• 1489 - req.esi should only be available in client threads.

• 1490 - Fix thread leak when reducing number of threads.

• 1491 - Reorder backend connection close procedure to help test cases.

• 1498 - Prefix translated VCL names to avoid name clashes.

• 1499 - Don't leak an objcore when HSH_Lookup returns expired object.

• 1493 - vcl_purge can return synth or restart.

• 1476 - Cope with systems having sys/endian.h and endian.h.

• 1496 - varnishadm should be consistent in argv ordering.

• 1494 - Don't panic on VCL-initiated retry after a backend 500 error.

• 1139 - Also reset keep (for IMS) time when purging.

• 1478 - Avoid panic when delivering an object that expires during delivery.

• 1504 - ACLs can be unreferenced with vcc_err_unref=off set.

• 1501 - Handle that a director couldn't pick a backend.

• 1495 - Reduce WRK_SumStat contention.

• 1510 - Complain on symbol reuse in VCL.

• 1514 - Document storage.NAME.free_space and .used_space [docs]

• 1518 - Suppress body on 304 response when using ESI.

• 1519 - Round-robin director does not support weight. [docs]

下载：https://repo.varnish-cache.org/source/varnish-4.0.1.tar.gz