Gmail removing hyperlinks from email. Why?

My application is expected to send email verification link to user.

When I open such an email in Gmail, the links are not shown, Gmail removes them.

If I select [Show original] option, I can see that the links are there.

• Why is it so?

• How can I fix this ?

Note: I’m on development server.

Displayed Email:

Hi from Team!

You just subscribed to our newsletter. Please click the link below in order to confirm:

Thank You!
Team

Original Email:

Content-Type: text/plain; charset="utf-8"
MIME-Version: 1.0
Content-Transfer-Encoding: 7bit


Hi from Team!

You just subscribed to our newsletter. Please click the link below in order to confirm:
http://127.0.0.1:8000/newsletter/verify_email/MTQ/bmq8o8-15cab7bf32186aab16c2c086e9beaec3/

Thank You!
Team

Thanks!