Error 500 because of invalid headers

[jvoisin]

It seems that something went wrong when creating the database of PHP, because elixir produces non-working pages:

==> /var/log/apache2/error.log <==
[Tue Jun 27 08:42:12.979348 2017] [http:error] [pid 11443:tid 116669335639808] [client 192.168.135.96:60244] AH02429: Response header name '<!--' contains invalid characters, aborting request, referer: http://10.1.76.1/php/php-7.1.6/ident/zend_string

==> /var/log/apache2/other_vhosts_access.log <==
elixir.example.com:80 192.168.135.96 - - [27/Jun/2017:08:42:12 +0000] "GET /php/php-7.1.6/source/Zend/zend_API.c HTTP/1.1" 500 777 "http://10.1.76.1/php/php-7.1.6/ident/zend_string" "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Ubuntu Chromium/58.0.3029.110 Chrome/58.0.3029.110 Safari/537.36"

Here is my Apache2 configuration:

<Directory /data/git/elixir/http/>
    Options +ExecCGI
    AllowOverride None
    Require all granted
    SetEnv PYTHONIOENCODING utf-8
    SetEnv LXR_PROJ_DIR /data/git/elixir-data
</Directory>

AddHandler cgi-script .py

<VirtualHost *:80>
    ServerName elixir.example.com
    DocumentRoot /data/git/elixir/http

    RewriteEngine on
    RewriteRule "^/$" "/php/latest/source" [R]
    RewriteRule "^/.*/(source|ident|search)" "/web.py" [PT]
</VirtualHost>

[tookilt]

try to add HttpProtocolOptions Unsafe

[jvoisin]

Wonderful, this fixes my issue ♥

[ibnbd]

@tookilt unfortunately I am encountering same problem, I am sorry I am not that pro with codes. Where exactly should I place HttpProtocolOptions Unsafe ?
on .htaccess or on my httpd.conf?
Thank You