Why the lack of the trailing slash in url adds :8080 to redirect? - html

Question

I have two website on an Ubuntu/Apache server.
One is in directory
/var/www/html/dir1
and is configured as virtual server in apache with FollowSymlink option activated. Replies to
http://example.com
The second is a webpage index.html in
/var/www/html/dir2
To obtain a simple way to link the second page to url
http://example.com/dir2
I made a soft link inside /var/www/html/dir1 to /var/www/html/dir2 named dir1 and all went ok.
Visiting
http://example.com/dir2/
lead to the page index.html in /var/www/html/dir2.
So far so good.
Though, visiting
http://example.com/dir2
(note the lack of the trailing slash)
cause the redirect to
http://example.com:8080/dir2/
Why in this case the port gets added? How can I easily remove it?
EDIT: I need to remove the port because from index.html some post request is made and the :8080 part is causing me some cors problems.
EDIT: Virtual Host conf
<VirtualHost *:8080>
DocumentRoot "/var/www/dir1/drupal"
ErrorLog /var/log/apache2/dir1-error.log
CustomLog /var/log/apache2/dir1-access.log combined
<Directory "/var/www/dir1/drupal/">
Options ExecCGI FollowSymLinks
AllowOverride all
Allow from all
Order allow,deny
</Directory>
</VirtualHost>
htaccess in dir1
#
# Apache/PHP/Drupal settings:
#
# Protect files and directories from prying eyes.
<FilesMatch "/fb/|/phpMyAdmin/|\.(engine|inc|info|install|make|module|profile|test|po|sh|.*sql|theme|tpl(\.php)?|xtmpl)$|^(\..*|Entries.*|Repository|Root|Tag|Template)$">
Order allow,deny
</FilesMatch>
# Don't show directory listings for URLs which map to a directory.
Options -Indexes
# Follow symbolic links in this directory.
Options +FollowSymLinks
# Make Drupal handle any 404 errors.
ErrorDocument 404 /index.php
# Set the default handler.
DirectoryIndex index.php index.html index.htm
# Override PHP settings that cannot be changed at runtime. See
# sites/default/default.settings.php and drupal_initialize_variables() in
# includes/bootstrap.inc for settings that can be changed at runtime.
# PHP 5, Apache 1 and 2.
<IfModule mod_php5.c>
php_flag magic_quotes_gpc off
php_flag magic_quotes_sybase off
php_flag register_globals off
php_flag session.auto_start off
php_value mbstring.http_input pass
php_value mbstring.http_output pass
php_flag mbstring.encoding_translation off
php_value upload_max_filesize 100M
php_value post_max_size 100M
</IfModule>
# Requires mod_expires to be enabled.
<IfModule mod_expires.c>
# Enable expirations.
ExpiresActive On
# Cache all files for 2 weeks after access (A).
ExpiresDefault A1209600
<FilesMatch \.php$>
ExpiresActive Off
</FilesMatch>
</IfModule>
# Various rewrite rules.
<IfModule mod_rewrite.c>
RewriteEngine on
RewriteRule "(^|/)\." - [F]
RewriteRule ^js\/(.*)$ /sites/all/modules/ets/jslib/$1 [L]
RewriteRule (.*)jslib\/\d+\/(.*)$ $1jslib/$2 [L,QSA]
RewriteRule (.*)experiments\/\d+\/(.*)$ $1experiments/$2 [L,QSA]
RewriteRule (.*)exp_packages\/\d+\/(.*)$ $1exp_packages/$2 [L,QSA]
# Pass all requests not referring directly to files in the filesystem to
# index.php. Clean URLs are handled in drupal_environment_initialize().
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteCond %{REQUEST_URI} !=/favicon.ico
RewriteRule ^ index.php [L]
# Rules to correctly serve gzip compressed CSS and JS files.
# Requires both mod_rewrite and mod_headers to be enabled.
<IfModule mod_headers.c>
# Serve gzip compressed CSS files if they exist and the client accepts gzip.
RewriteCond %{HTTP:Accept-encoding} gzip
RewriteCond %{REQUEST_FILENAME}\.gz -s
RewriteRule ^(.*)\.css $1\.css\.gz [QSA]
# Serve gzip compressed JS files if they exist and the client accepts gzip.
RewriteCond %{HTTP:Accept-encoding} gzip
RewriteCond %{REQUEST_FILENAME}\.gz -s
RewriteRule ^(.*)\.js $1\.js\.gz [QSA]
# Serve correct content types, and prevent mod_deflate double gzip.
RewriteRule \.css\.gz$ - [T=text/css,E=no-gzip:1]
RewriteRule \.js\.gz$ - [T=text/javascript,E=no-gzip:1]
<FilesMatch "(\.js\.gz|\.css\.gz)$">
# Serve correct encoding type.
Header set Content-Encoding gzip
# Force proxies to cache gzipped & non-gzipped css/js files separately.
Header append Vary Accept-Encoding
</FilesMatch>
</IfModule>
</IfModule>

Answer 1

Add this rule just below RewriteEngine On line:
# add a trailing slash to directories
RewriteCond %{REQUEST_FILENAME} -d
RewriteRule [^/]$ %{REQUEST_URI}/ [L,NE,R=301]
and retest in a new browser or completely clear browser cache.