Bug 62184

Summary: Documentation: UNIQUE_ID length change from 24 to 27 characters
Product: Apache httpd-2 Reporter: nada <apache_bugzilla>
Component: DocumentationAssignee: HTTP Server Documentation List <docs>
Status: NEW ---    
Severity: normal CC: apache-bugzilla
Priority: P2    
Version: 2.4.29   
Target Milestone: ---   
Hardware: PC   
OS: Linux   

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.