Symfony 1.4: Second app on custom domain? - mod-rewrite

Question

PHP start scripts:
Primary app:
~ec2-user/project/web/index.php
Secondary app:
~ec2-user/project/web/api1.php
Apache configuration:
Excerpt from /etc/httpd/conf/httpd.conf:
<VirtualHost *:80>
ServerName example.com
DocumentRoot /home/ec2-user/project/web
DirectoryIndex index.html index.php
<Directory /home/ec2-user/project/web>
AllowOverride All
Allow from All
</Directory>
</VirtualHost>
<VirtualHost *:80>
ServerName 1.api.example.com # 1: version number
DocumentRoot /home/ec2-user/project/web
<Directory /home/ec2-user/project/web>
AllowOverride None
</Directory>
RewriteEngine On
RewriteRule ^(.*)$ /api1_dev.php [QSA,L]
</VirtualHost>
~ec2-user/project/web/.htaccess (should only apply to primary app):
Options +FollowSymLinks +ExecCGI
<IfModule mod_rewrite.c>
RewriteEngine On
# uncomment the following line, if you are having trouble
# getting no_script_name to work
#RewriteBase /
# we skip all files with .something
#RewriteCond %{REQUEST_URI} \..+$
#RewriteCond %{REQUEST_URI} !\.html$
#RewriteRule .* - [L]
# we check if the .html version is here (caching)
RewriteRule ^$ index.html [QSA]
RewriteRule ^([^.]+)$ $1.html [QSA]
RewriteCond %{REQUEST_FILENAME} !-f
# no, so we redirect to our front web controller
RewriteRule ^(.*)$ index.php [QSA,L]
</IfModule>
What loads as expected:
http://example.com: home page
http://example.com/api1.php/foo/bar: some JSON data
What doesn't load:
http://1.app.example.com/foo/bar:
404 | Not Found | sfError404Exception
Empty module and/or action after parsing the URL "/" (/).
[…]
What am I missing?

Answer 1

In ~ec2-user/project/web/.htaccess,
Uncomment RewriteBase /, it becomes this:
Options +FollowSymLinks +ExecCGI
RewriteEngine On
# uncomment the following line, if you are having trouble
# getting no_script_name to work
RewriteBase /
# we skip all files with .something
#RewriteCond %{REQUEST_URI} \..+$
#RewriteCond %{REQUEST_URI} !\.html$
#RewriteRule .* - [L]
# we check if the .html version is here (caching)
RewriteRule ^$ index.html [QSA]
RewriteRule ^([^.]+)$ $1.html [QSA]
RewriteCond %{REQUEST_FILENAME} !-f
# no, so we redirect to our front web controller
RewriteRule ^(.*)$ index.php [QSA,L]

Answer 2

I got it to work by changing:
RewriteRule ^(.*)$ /api1_dev.php [QSA,L]
into:
RewriteRule ^(.*)$ /api1_dev.php/$1 [QSA,L]
Makes sense. I only wonder why in the .htaccess for example.com, the $1
is not necessary:
RewriteRule ^(.*)$ index.php [QSA,L]