HTTPS can now be used for free on GAE, so I tried it to see if it really works.

Hello.
I'm Mandai, in charge of Wild on the development team.

Shocking (well, I thought it would happen eventually) news came to me.
Google App Engine (GAE) now allows you to use HTTPS for free at all times!

This time, I tried to see if it was really possible to use HTTPS for free.

 

Let's go right away

When I log in to the console and look at the settings of the existing instance...

It's written!

To access this screen, select "Custom Domain" → "Add Custom Domain" from "Settings".

By the way, when you press "Register new domain", you will be redirected to Google Domains.

 

First, check that you own the domain

Select the registrar where you acquired your domain in Webmaster Central.
If you are purchasing from a registrar that is not on this list, or if you are unsure, select "Other" at the bottom to register and check the TXT record or CNAME record.
This time, I checked by using CNAME.

Check the TTL and if it has been updated appropriately, press the confirm button to confirm.
Once confirmed, proceed to the next step.

 

Create domain mapping information

Next, set the domain to be mapped to the GAE instance.

Normally, two types of domains are mapped: the entered one and the domain with www added, but if you have any other subdomains that you want to map, enter them here.
Once saved, the display will look like the one below.

Once input is complete, the A record, AAAA record, and CNAME record will be displayed.

Register this in DNS and press Finish to complete the registration.

It says that the SSL certificate can be granted in a few minutes, but SSL will not be valid unless the above DNS is registered.
I waited for a while because I thought it wouldn't take effect, but it turned out to be true...

Once the settings are complete, it should look like this:

If you check it in your browser, you will see that it is enabled properly.

As of September 19th, this feature is in alpha version, so please ignore it!

 
That's it.