Bug 62184 - Documentation: UNIQUE_ID length change from 24 to 27 characters
Summary: Documentation: UNIQUE_ID length change from 24 to 27 characters
Status: NEW
Alias: None
Product: Apache httpd-2
Classification: Unclassified
Component: Documentation (show other bugs)
Version: 2.4.29
Hardware: PC Linux
: P2 normal (vote)
Target Milestone: ---
Assignee: HTTP Server Documentation List
Depends on:
Reported: 2018-03-16 10:49 UTC by nada
Modified: 2021-02-28 12:21 UTC (History)
1 user (show)


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Description nada 2018-03-16 10:49:42 UTC
The length of UNIQUE_ID changed in 2.4.29 from 24 to 27 bytes. This should also be changed in the docs.

This change was introduced with r1501827.

See also https://lists.apache.org/thread.html/79fad060f1b129a3c57172887b923b0f110c202508a0dd2aaac481cc@%3Cusers.httpd.apache.org%3E

File to change: docs/manual/mod/mod_unique_id.html (and translations)
Comment 1 nada 2018-03-16 10:51:34 UTC
This was the merge to 2.4.x: r1812267
Comment 2 Christophe JAILLET 2021-02-28 12:21:57 UTC
There is much more to change in the mod_unique_id documentation.

As noted in a comment in r1501827:

  * Note: previous implementations used 32-bits of IP address plus pid
  * in place of the PRNG output in the "root" field.  This was
  * insufficient for IPv6-only hosts, required working DNS to determine
  * a unique IP address (fragile), and needed a [0, 1) second sleep
  * call at startup to avoid pid reuse.  Use of the PRNG avoids all
  * these issues.