Truncated or oversized response headers in daemon mode - flask

Question

I've a weird error in a flask website.
Important : The first page (a form) is running, but when I submit, I've a 505.
I try severals things thaks to StackOverflow :), but I cannot find the solution.
Here the log :
Mon Feb 25 09:17:37.863313 2019] [wsgi:info] [pid 30874:tid 140525377849088] [remote 192.168.56.1:61092] mod_wsgi (pid=30874, process='flask_my_app', application=''): Loading WSGI script '/var/www/my_app/my_app/flask_my_app/flask_my_app.wsgi'.
[Mon Feb 25 09:17:38.191855 2019] [wsgi:error] [pid 30874:tid 140525377849088] /home/vagrant/.virtualenvs/my_app/lib/python2.7/site-packages/psycopg2/__init__.py:144: UserWarning: The psycopg2 wheel package will be renamed from release 2.8; in order to keep installing from binary please use "pip install psycopg2-binary" instead. For details see: <http://initd.org/psycopg/docs/install.html#binary-install-from-pypi>.
[Mon Feb 25 09:17:38.191899 2019] [wsgi:error] [pid 30874:tid 140525377849088] """)
[Mon Feb 25 09:17:44.995445 2019] [wsgi:error] [pid 30781:tid 140525239768832] [client 192.168.56.1:3595] Truncated or oversized response headers received from daemon process 'flask_my_app': /var/www/my_app/my_app/flask_my_app/flask_my_app.wsgi, referer: http://vm.my_app/
==> /var/log/apache2/error.log <==
[Mon Feb 25 09:17:45.562808 2019] [core:notice] [pid 30767:tid 140525508945792] AH00051: child pid 30874 exit signal Segmentation fault (11), possible coredump in /etc/apache2
==> /var/log/apache2/my_app-error.log <==
[Mon Feb 25 09:17:45.589899 2019] [wsgi:info] [pid 30956:tid 140525508945792] mod_wsgi (pid=30956): Attach interpreter ''.
[Mon Feb 25 09:17:45.591070 2019] [wsgi:info] [pid 30956:tid 140525508945792] mod_wsgi (pid=30956): Adding '/var/www/my_app/my_app' to path.
[Mon Feb 25 09:17:45.595458 2019] [wsgi:info] [pid 30956:tid 140525508945792] mod_wsgi (pid=30956): Adding '/home/vagrant/.virtualenvs/my_app/lib/python2.7/site-packages' to path.
[Mon Feb 25 09:17:45.608611 2019] [wsgi:info] [pid 30956:tid 140525377849088] [remote 192.168.56.1:61092] mod_wsgi (pid=30956, process='flask_my_app', application=''): Loading WSGI script '/var/www/my_app/my_app/flask_my_app/flask_my_app.wsgi'.
[Mon Feb 25 09:17:45.916197 2019] [wsgi:error] [pid 30956:tid 140525377849088] /home/vagrant/.virtualenvs/my_app/lib/python2.7/site-packages/psycopg2/__init__.py:144: UserWarning: The psycopg2 wheel package will be renamed from release 2.8; in order to keep installing from binary please use "pip install psycopg2-binary" instead. For details see: <http://initd.org/psycopg/docs/install.html#binary-install-from-pypi>.
[Mon Feb 25 09:17:45.916224 2019] [wsgi:error] [pid 30956:tid 140525377849088] """)
My Virtual Host in Apache 2.7 is here :
<VirtualHost *:80>
ServerName vm.my_app
ServerAlias vm.my_app
DocumentRoot /var/www/my_app/my_app
LogLevel info
WSGIDaemonProcess flask_my_app python-path=/var/www/my_app/my_app:/home/vagrant/.virtualenvs/my_app/lib/python2.7/site-packages display-name=%{GROUP}
WSGIProcessGroup flask_my_app
WSGIScriptAlias / /var/www/my_app/my_app/flask_my_app/flask_my_app.wsgi
WSGIApplicationGroup %{GLOBAL}
#Alias /favicon.ico /var/www/my_app/my_app/static/favicon.ico
Alias /site_media/ /var/www/my_app/my_app/site_media/
Alias /media/ /var/www/my_app/my_app/media/
Alias /static/ /var/www/my_app/my_app/static/
AliasMatch /([/]*\.css) /var/www/my_app/my_app/static/css/$1
<Directory /var/www/my_app/my_app>
Order allow,deny
Allow from all
Require all granted
</Directory>
<Directory /var/www/my_app/my_app/flask_my_app>
Order allow,deny
Allow from all
Require all granted
</Directory>
ErrorLog ${APACHE_LOG_DIR}/my_app-error.log
CustomLog ${APACHE_LOG_DIR}/my_app-access.log combined
</VirtualHost>
The python version is 2.7.12, and I use "virtual env wrapper".
The version of the wsgi module is old I think :
lrwxrwxrwx 1 root root 15 mai 3 2016 mod_wsgi.so -> mod_wsgi.so-2.7*
-rwxrwxrwx 1 root root 223K mai 3 2016 mod_wsgi.so-2.7*
The wsgi file is "classic", and the requirements.txt file :
$ cat ../requirements.txt
click==6.7
Flask==1.0.2
Flask-Assets==0.12
Flask-Caching==1.4.0
Flask-Login==0.4.1
Flask-SQLAlchemy==2.3.2
Flask-WTF==0.14.2
itsdangerous==0.24
Jinja2==2.10
MarkupSafe==1.0
pbr==5.1.1
psycopg2==2.7.5
six==1.12.0
SQLAlchemy==1.2.8
stevedore==1.30.0
webassets==0.12.1
Werkzeug==0.14.1
WTForms==2.2.1
Can anobody helps me ?
Thanks a lot
F.

Answer 1

It's maybe useful to others, that my issue was fixed by desactivating the SSL support !!!, in postgresql.conf :
80 ssl = off # (change requires restart)
the log :
==> /var/log/postgresql/postgresql-9.6-main.log <==
2019-03-07 15:28:28.573 CET [5346] [unknown]#[unknown] LOG: could not accept SSL connection: EOF detected