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### Description of problem:
"ProxyAddHeaders Off" does not become effective when it's defined outside <Proxy> setting. X-Forwarded-For, X-Forwarded-Host and X-Forwarded-Server http headers are still passed to the backend server.
~~~
ProxyPass / http://localhost:8080/
ProxyPassReverse / http://localhost:8080/
ProxyAddHeaders Off
<Proxy "*">
Require all granted
# ...(any other config)...
</Proxy>
~~~
### Version-Release number of selected component (if applicable):
httpd-2.4.6-45.el7.x86_64
### How reproducible:
Anytime
### Steps to Reproduce:
1. Configure the above proxy config in Apache httpd
2. Start Apache httpd and backend server
3. Send http request
4. See if X-Forwarded-For, X-Forwarded-Host and X-Forwarded-Server headers are passed to the backend server
### Actual results:
X-Forwarded-For, X-Forwarded-Host and X-Forwarded-Server headers are still passed to the backend server.
### Expected results:
X-Forwarded-For, X-Forwarded-Host and X-Forwarded-Server headers does not exist in the forwarded request header to the backend server.
### Additional info:
Workaround exists. When moving "ProxyAddHeaders Off" inside <Proxy> setting, it works like a charm:
~~~
ProxyPass / http://localhost:8080/
ProxyPassReverse / http://localhost:8080/
<Proxy "*">
ProxyAddHeaders Off
Require all granted
# ...(any other config)...
</Proxy>
~~~
This like a bug in 2.4, mod_proxy.c is not merging the config properly.
static void *merge_proxy_dir_config(apr_pool_t *p, void *basev, void *addv)
...
new->add_forwarded_headers = add->add_forwarded_headers;
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.
For information on the advisory, and where to find the updated
files, follow the link below.
If the solution does not work for you, open a new bug report.
https://access.redhat.com/errata/RHBA-2018:0826