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]
项目主页：https://www.varnish-cache.org/
下载地址：https://repo.varnish-cache.org/source/varnish-4.0.1.tar.gz
来自:开源中国社区
