Redirect from HTTP to HTTPS in Apache with ".htaccess"

1. Redirect all files in a directory
Add these contents into the ".htaccess" file under your directory.
##################
RewriteEngine On
RewriteCond %{HTTPS} !on
RewriteRule (.*) https://%{HTTP_HOST}%{REQUEST_URI}
##################
Then:
"http://domain/dir/a.php" will redirect into "https://domain/dir/a.php",
"http://domain/dir/b.php" will redirect into "https://domain/dir/b.php",
"http://domain/dir/c.php" will redirect into "https://domain/dir/c.php".

2. Redirect a single file in a directory
Add these contents into the ".htaccess" file under the directory containing your file.
##################
<FilesMatch "^login\.php$">
  RewriteEngine On
  RewriteCond %{HTTPS} !on
  RewriteRule (.*) https://%{HTTP_HOST}%{REQUEST_URI}
</FilesMatch>
##################
Then:
"http://domain/dir/login.php" will redirect into "https://domain/dir/login.php"
"http://domain/dir/other_files.php" will not redirect.

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