https://bz.apache.org/bugzilla/show_bug.cgi?id=69256
Bug ID: 69256
Summary: RewriteMap prg: details missing
Product: Apache httpd-2
Version: 2.4.62
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P2
Component: Documentation
Assignee: docs@httpd.apache.org
Reporter: ch...@chead.ca
Target Milestone: ---
The documentation for RewriteMap prg: here
<https://httpd.apache.org/docs/2.4/rewrite/rewritemap.html#prg> left me with a
number of questions that I could not find the answer to:
* “it expects one argument via STDIN” What exactly does this mean? Each key fed
to stdin is followed by a newline? A space? Something else? There’s an example,
but that’s not very useful for those of us who don’t read Perl.
* “If there is no corresponding lookup value, the map program should return the
four-character string "NULL" to indicate this.” Does this mean there’s no way
for the mapping program to return the actual literal string NULL as the mapped
value, since trying to do so indicates failure to map instead?
* The documentation explains how stdin and stdout are used. What does Apache do
with the mapping program’s stderr? Connect it to /dev/null? Not open it at all?
Something else?
* What happens if the mapping program terminates? The text “Remember that there
is only one copy of the program, started at server startup.” suggests that it
will just stay dead and mappings will fail until Apache is restarted, but is
that actually true?
* What happens when Apache terminates? Does it send a signal to terminate the
mapping program? If so, what signal? Or does it just close stdin and expect the
mapping program to terminate when it sees EOF? Since the mapping program is a
child process of Apache, does Apache wait for it to terminate before finishing
shutdown, or does it orphan it and let PID 1 deal with it?
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