Hi there,

I'm hoping someone can help me out here :-)

*Problem description:*
- When setting the Django settings option "DEBUG = False" (typically used 
to switch to production settings) I get a "Gateway Timeout" from Apache. 
When "DEBUG = True" everything works just fine!
- Apache error: *mod_wsgi Timeout when reading response headers from daemon 
process.*

*Setup:*
- I have a vanilla install of Ubuntu16.04 with Apache 2.4. As per the 
"mod_wsgi" documentation I am making use of the virtual environment to load 
up the "mod_wsgi" environment into Apache.
- I have a Python virtual environment running where all of my required 
Python libraries / modules are located (including "mod_wsgi"). All Python 
libraries / modules are at the latest stable versions.
- I have only used the default package managers i.e.: apt and pipenv 
respectively on this clean install.
- The Apache user / group "www-data" is the owner of the default 
"/var/www/" directory.

*Apache virtual host configuration:*
"""
<VirtualHost *:80>
    ServerName www.blah.com
    ServerAlias blah.com
    RewriteEngine On
    RewriteCond %{HTTP:X-Forwarded-Proto} !https
    RewriteRule . https://www.blah.com%{REQUEST_URI} [L,R=permanent]
</VirtualHost>

<VirtualHost *:443>
    ServerName www.blah.com
    ServerAlias blah.com

    SSLEngine on
    SSLCertificateFile /var/www/.ssl/blah.com.pem
    SSLCertificateKeyFile /var/www/.ssl/blah.com.key

    LogLevel info
    ErrorLog /var/www/logs/error-blah.log
    CustomLog /var/www/logs/access-blah.log combined

    DocumentRoot /var/www/blah.com

    Alias /static 
/var/www/.virtualenvs/www-elNfpBxP/lib/python3.5/site-packages/django/contrib/admin/static/

    <Directory /var/www/blah.com>
        Require all granted
    </Directory>

    WSGIDaemonProcess blah processes=5 inactivity-timeout=300 
display-name=%{GROUP} python-home=/var/www/.virtualenvs/www-elNfpBxP/ 
python-path=/var/www/blah.com/
    WSGIProcessGroup blah
    WSGIApplicationGroup %{GLOBAL}
    WSGIScriptAlias / /var/www/blah.com/etc/wsgi/production_platform.py 
process-group=blah application-group=%{GLOBAL}
    WSGIPassAuthorization On
</VirtualHost>

LoadModule wsgi_module 
/var/www/.virtualenvs/www-elNfpBxP/lib/python3.5/site-packages/mod_wsgi/server/mod_wsgi-py35.cpython-35m-x86_64-linux-gnu.so
WSGIRestrictEmbedded On
WSGILazyInitialization On
"""

*Apache configuration output:*
"""
*$ apachectl -V*

Server version: Apache/2.4.18 (Ubuntu)
Server built:   2017-09-18T15:09:02
Server's Module Magic Number: 20120211:52
Server loaded:  APR 1.5.2, APR-UTIL 1.5.4
Compiled using: APR 1.5.2, APR-UTIL 1.5.4
Architecture:   64-bit
Server MPM:     event
  threaded:     yes (fixed thread count)
    forked:     yes (variable process count)
Server compiled with....
 -D APR_HAS_SENDFILE
 -D APR_HAS_MMAP
 -D APR_HAVE_IPV6 (IPv4-mapped addresses enabled)
 -D APR_USE_SYSVSEM_SERIALIZE
 -D APR_USE_PTHREAD_SERIALIZE
 -D SINGLE_LISTEN_UNSERIALIZED_ACCEPT
 -D APR_HAS_OTHER_CHILD
 -D AP_HAVE_RELIABLE_PIPED_LOGS
 -D DYNAMIC_MODULE_LIMIT=256
 -D HTTPD_ROOT="/etc/apache2"
 -D SUEXEC_BIN="/usr/lib/apache2/suexec"
 -D DEFAULT_PIDLOG="/var/run/apache2.pid"
 -D DEFAULT_SCOREBOARD="logs/apache_runtime_status"
 -D DEFAULT_ERRORLOG="logs/error_log"
 -D AP_TYPES_CONFIG_FILE="mime.types"
 -D SERVER_CONFIG_FILE="apache2.conf"

*$ apachectl -M*

Loaded Modules:
 core_module (static)
 so_module (static)
 watchdog_module (static)
 http_module (static)
 log_config_module (static)
 logio_module (static)
 version_module (static)
 unixd_module (static)
 access_compat_module (shared)
 alias_module (shared)
 auth_basic_module (shared)
 authn_core_module (shared)
 authn_file_module (shared)
 authz_core_module (shared)
 authz_host_module (shared)
 authz_user_module (shared)
 autoindex_module (shared)
 deflate_module (shared)
 dir_module (shared)
 env_module (shared)
 filter_module (shared)
 mime_module (shared)
 mpm_event_module (shared)
 negotiation_module (shared)
 rewrite_module (shared)
 setenvif_module (shared)
 socache_shmcb_module (shared)
 ssl_module (shared)
 status_module (shared)
 wsgi_module (shared)

*$ ~/.virtualenvs/www-elNfpBxP/lib/python3.5/site-packages/mod_wsgi/server$ 
ldd mod_wsgi-py35.cpython-35m-x86_64-linux-gnu.so*

linux-vdso.so.1 =>  (0x00007fffa35db000)
libpython3.5m.so.1.0 => /usr/lib/x86_64-linux-gnu/libpython3.5m.so.1.0 
(0x00007fd6159e1000)
libpthread.so.0 => /lib/x86_64-linux-gnu/libpthread.so.0 
(0x00007fd6157c4000)
libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007fd6153fa000)
libexpat.so.1 => /lib/x86_64-linux-gnu/libexpat.so.1 (0x00007fd6151d1000)
libz.so.1 => /lib/x86_64-linux-gnu/libz.so.1 (0x00007fd614fb7000)
libdl.so.2 => /lib/x86_64-linux-gnu/libdl.so.2 (0x00007fd614db3000)
libutil.so.1 => /lib/x86_64-linux-gnu/libutil.so.1 (0x00007fd614bb0000)
libm.so.6 => /lib/x86_64-linux-gnu/libm.so.6 (0x00007fd6148a7000)
/lib64/ld-linux-x86-64.so.2 (0x00007fd6162a3000)
"""

Any ideas as to how I can isolate the what is causing the problem or point 
me in the right direction before I go down the proverbial rabbit hole?

Thanks in advance.
Thomas

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