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Add a section to mpm-event's documentation to advertise new changes

I tried to add a summary of Stefan's last patches just backported to
2.4.x today. I've read all of them and tried to report Stefan's comment
from PR 53555 as much as possible. Please review and let me know if I wrong
something incorrect or not precise enough.

Fixed some wording in mpm-event's doc page

Added some notes in mpm-event's doc page

Submitted by: elukey



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Follow up to r1773761: restore EOC semantic.


Submitted by: ylavic
Reviewed/backported by: jim


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short-circuit some kinds of looping in RewriteRule.

PR60478

Submitted By: Jeff Wheelouse <apache wheelhouse.org>
Committed By: covener



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propose


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Translated by: Nilgün Belma Bugüner <nilgun belgeler.gen.tr>
Reviewed by:  Orhan Berent <berent belgeler.gen.tr> 


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Allow for initual burst at full speed


Some "error" reporting if we overflow


rate limit notes


xhtml

Reviewed/backported by: jim


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add buzz word

Reviewed/backported by: jim


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html elements

Reviewed/backported by: jim


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heh... bring memcache up to redis :)
mod_status info

From Norm:
NWGNUsocachmem needs to find mod_status.h

Reviewed/backported by: jim


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change error handling for bad resp headers

 - avoid looping between ap_die and the http filter
 - remove the header that failed the check
 - keep calling apr_table_do until our fn stops matching


This is still not great. We get the original body, a 500 status
code and status line.

(r1773285 + fix for first return from check_headers)




Follow up to r1773293.
When check_headers() fails, clear anything (headers and body) from original/errorneous
response before returning 500.


Follow up to r1773761: don't check_headers() more than once.

Follow up to r1773761: don't recurse on internal redirects.

Follow up to r1773761: don't recurse on ap_send_error_response() either.

Follow up to r1773761: we need to check both ap_send_error_response() and internal redirect recursions.

Follow up to r1773761: improved recursion detection.
Submitted by: covener, ylavic, ylavic, ylavic, ylavic, ylavic, ylavic
Reviewed/backported by: jim


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drop proposal

surafe two showstoppers discussed elsewhere in STATUS



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After eliminating unusual whitespace in Unsafe mode (e.g. \f \v), we are left
with the same behavior in both of these cases. Simplify. Noted by rpluem.


Submitted by: wrowe
Reviewed/backported by: jim


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Partial port of proposed r1773158 for httpd-2.x only; this change causes all
illegible protocol args to be rejected, irrespective of the strict toggle as
we expect this to occur with a garbage raw SP embedded in the request URI.

Simplifies the code using the protocol 0.9 sentinal to set up an http/1.0
error response.

String duplication of r1773158 is uninteresting, httpd-2.x has a const protocol
member.

Submitted by: rpluem, wrowe


Submitted by: wrowe
Reviewed/backported by: jim


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Drop C-L header and message-body from HTTP 204 responses.

The C-L header can be set in a fcgi/cgi backend or in other
filters like ap_content_length_filter (with the value of 0),
meanwhile the message-body can be returned incorrectly
by any backend. The idea is to remove unnecessary bytes
from a HTTP 204 response.

PR 51350

Submitted by: elukey
Reviewed/backported by: jim


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ProxyPass ! doesn't block per-directory ProxyPass

 *) mod_proxy: Honor a server scoped ProxyPass exception when ProxyPass is
     configured in <Location>, like in 2.2. PR 60458.
     [Eric Covener]


Submitted by: covener
Reviewed/backported by: jim


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