Redirect POST htaccess

Question

This question is very similar to: Is it possible to redirect post data? (asked eariler) but that answer does not seem to work for me.

I have a form:

Answer 1

Your "add trailing slash" rule forces a header redirect:

 [R=301,L]

a header redirect will drop POST values.

You will have to drop that rule, or disable it for POST submissions:

# Forces a trailing slash to be added

RewriteCond %{REQUEST_METHOD}  !=POST
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteCond %{REQUEST_URI} !(\.[a-zA-Z0-9]{1,5}|/)$
RewriteRule (.*)$ /$1/ [R=301,L]