Solution as:

Check the proxy host by curl http://node3.example.com

Solution as:
# pwd
/home/admin/ansible/
# vim web.yml
---
- name:
hosts: dev
tasks:
- name: create group
yum:
name: httpd
state: latest
- name: create group
group:
name: apache
state: present
- name: creating directiory
file:
path: /webdev
state: directory
mode: '2775'
group: apache
- sefcontext:
target: '/webdev/index.html'
setype: httpd_sys_content_t
state: present
- name: Apply new SELinux file context to filesystem
command: restorecon -irv
- name: creating symbolic link
file:
src: /webdev
dest: /var/www/html/webdev
state: link
force: yes
- name: creating file
file:
path: /webdev/index.html
sate: touch
- name: Adding content to index.html file
copy:
dest: /webdev/index.html
content: "Development"
- name: add service to the firewall
firewalld:
service: http
permanent: yes
state: enabled
immediate: yes
- name: active http service
service:
name: httpd
state: restarted
enabled: yes
:wq
# ansible-playbook web.yml --syntax-check
# ansible-playbook web.yml

in /home/sandy/ansible/roles
vim requirements.yml

Run the requirements file from the roles directory:
ansible-galaxy install -r requirements.yml -p /home/sandy/ansible/roles