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In PR 58231 is was brought up that httpd adds the
Vary: Host header whenever a condition is set to true
in mod_rewrite or in an <If> block.

The https://tools.ietf.org/html/rfc7231#section-7.1.4
section seems to disallow this use case:

"The "Vary" header field in a response describes "
"what parts of a request message, "
"aside from the method, Host header field, [...]"

I had a chat with the folks in #traffic-server and
they don't see much point in having a Vary: Host header,
plus it was reported that Varnish doesn't like it very
much (namely it does not cache the response when
it sees the header, links of the report in the PR).

I don't see much value in this behavior of httpd so
I am inclined to remove this response header value,
but I'd be glad to get a more experienced opinion.



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mod_md: v0.9.6: a "MDRequireHttps permament" configured domain automatically sends out HSTS (rfc 6797) headers in https: responses. 



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mod_ssl: adding ssl_policies.h[.in] for policy cipher/protocol definitions. Use 
     update_policies.py to update manually from Mozilla JSON definitions at
     https://statics.tls.security.mozilla.org/server-side-tls-conf.json



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mod_md: v0.9.5:
     - New directive (srly: what do you expect at this point?) "MDMustStaple on|off" to control if
       new certificates are requested with the OCSP Must Staple extension.
     - Known limitation: when the server is configured to ditch and restart child processes, for example
       after a certain number of connections/requests, the mod_md watchdog instance might migrate 
       to a new child process. Since not all its state is persisted, some messsages might appear a
       second time in the logs.
     - Adding checks when 'MDRequireHttps' is used. It is considered an error when 'MDPortMap 443:-'
       is used - which negates that a https: port exists. Also, a warning is logged if no 
       VirtualHost can be found for a Managed Domain that has port 443 (or the mapped one) in
       its address list.
     - New directive 'MDRequireHttps' for redirecting http: traffic to a Managed Domain, permanently
       or temporarily.
     - Fix for using a fallback certificate on initial signup of a Managed Domain. Requires also
       a changed mod_ssl patch (v5) to take effect.
     - compatibility with libressl



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  length filter to avoid arbitrary memory consumption for streaming
  responses (e.g. large CGI script output).  Ensures C-L is still
  generated in common cases (static content, small CGI script output),
  but this DOES change behaviour and some responses will end up
  chunked rather than C-L computed.

PR: 61222
Submitted by: jorton, rpluem


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Creditis to Humbedooh for all the work.



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Procedure that I've used:

1) Copy https://httpd.apache.org/docs/trunk/mod/directives.html
   to a text file.
2) Generate a csv with something like 
   cat /tmp/trunk_directives | sort | tr "\n" ","
3) Replace the content of CONFIG_KEYWORDS in prettify.js
   with the list generated in 2)
4) Run the command the MINIFY command to generate prettify.min.js

This commit should hopefully allow a better syntax highlighting
in our docs examples.



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mod_ssl: properly initializing server for fallback certificates provided by mod_md.



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Based on the work of Bernard Spil <brnrd freebsd org>.

PR: 61512


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Fix mixed declarations and code [-Wdeclaration-after-statement].



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Reported by: Hanno Böck
PR: 61511



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This commit is a follow up of r1802040 based on Jacob's
feedback, namely inserting the FLUSH buckets only when
really needed and useful, not always.



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