Sandeep, are you talking about customizing your Dynatrace Managed url? If so, you can find the details here: https://answers.dynatrace.com/spaces/482/dynatrace...
If not, could you please elaborate your question.
You will have to do the redirection by yourself. You will need a webserver listening at tcp port 80 that will redirect all requests to the https at 443. (For example apache with mod_rewrite module enabled).
Dynatrace managed installation has a built-in nginx (for balancing between dynatrace servers in your environment), but i'd strongly recommend not to touch its configuration.