I add a site to Cloudflare and try activate flexible SSL plan for it.I was able to add SSL by adding page rules to main domain (example.com) and www as well.It's working nicely and browser shows https also.Then I added SSL to subdomain of my domain blog (blog.example.com).But it's not working.I activate SSL for subdomain by giving URL patter as  *.example.com.How can I resolve this thing ? Thanks !
Cloudflare free SSL not working for Subdomain due to mixed content issue (Solved)
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Got it solved.That directory which is forwarded my subdomain consist wordpress blog.It happens like this because of mixed content issue.Here is the solution. https://blog.cloudflare.com/flexible-ssl-wordpress-fixing-mixed-content-errors/