.htaccess non-www to www and http to https redirects - apache

Question

For some reason my redirects are not working. I just want non-www to go to www and non-https to go to https. Here's what I've got. It's from this post.
RewriteCond %{HTTP_HOST} ^example\.com$ [NC]
RewriteRule (.*) https://www.example.com/$1 [R=301,L]
RewriteCond %{HTTP_HOST} ^www\.example\.com$ [NC]
RewriteCond %{HTTP:X-Forwarded-Proto} !=https
RewriteRule (.*) https://www.example.com/$1 [R=301,L]
EDIT: Here is my whole file.
# BEGIN WordPress
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /
RewriteCond %{HTTPS} Off
RewriteRule ^ https://%{HTTP_HOST}%{REQUEST_URI} [R=301,L]
RewriteCond %{HTTP_HOST} blog.example.com
RewriteRule ^(.*)$ https://www.example.com/blog/$1 [R=permanent,L]
RewriteCond %{HTTP_HOST} ^example.com/blog/$ [NC]
RewriteRule (.*) https://www.exmaple.com/blog/$1 [R=301,L]
RewriteCond %{HTTP_HOST} ^www.example.com/blog/$ [NC]
RewriteCond %{HTTP:X-Forwarded-Proto} !=https
RewriteRule (.*) https://www.example.com/blog/$1 [R=301,L]
RewriteBase /
RewriteRule ^index\.php$ - [L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /index.php [L]
</IfModule>
# END WordPress

Answer 1

I just want non-www to go to www and non-https to go to https.
What you had initially was close, but it depends on how the SSL cert is managed. If the SSL is managed by a front-end proxy (eg. Cloudflare flexible-SSL/FREE option) then it maybe OK. However, if the SSL cert is installed directly on your server then probably not.
Try something like:
# Non-www to www
RewriteCond %{HTTP_HOST} !^www\.
RewriteRule (.*) https://www.%{HTTP_HOST}/$1 [R,L]
# Non-SSL to SSL
RewriteCond %{HTTPS} off
RewriteRule (.*) https://%{HTTP_HOST}/$1 [R,L]
This assumes you only have example.com and www.example.com, and no other subdomains. However, in your edited code you make reference to a blog subdomain - this will be OK, provided you include the blog redirect first.
This is currently a temporary (302) redirect. Change the R to R=301 (permanent) only when you are sure it's working OK.
Make sure you browser catch is clear before testing.
Summary
The complete code would look something like:
# Redirect blog subdomain to main domain (required?)
RewriteCond %{HTTP_HOST} ^(www\.)?blog\.example\.com
RewriteRule (.*) https://www.example.com/blog/$1 [R=301,L]
# Non-www to www
RewriteCond %{HTTP_HOST} !^www\.
RewriteRule (.*) https://www.%{HTTP_HOST}/$1 [R=301,L]
# Non-SSL to SSL
RewriteCond %{HTTPS} off
RewriteRule (.*) https://%{HTTP_HOST}/$1 [R=301,L]
# BEGIN WordPress
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /
RewriteRule ^index\.php$ - [L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /index.php [L]
</IfModule>
# END WordPress
It is best not to edit between the # BEGIN WordPress blocks to avoid your custom code being overwritten by WordPress.
Only include the RewriteBase directive once in your code (only the last instance will do anything). Currently, the RewriteBase directive is not actually doing anything anyway, since you have no relative path substitutions.