USPS: Unsecure HTTP Endpoint Retirement

[jouriy]

Preconditions (*)

1. Effective June 24 th , 2021, USPS Web Tools will remove support for all unsecure HTTP endpoints. According to the USPS Web Tools API Release Notes https://www.usps.com/business/web-tools-apis/2021-web-tools-release-notes.pdf (section 2.6.1 on page 6):
   After this change, all requests to an unsecure HTTP endpoint will fail when attempting to access the Web Tools APIs and integrators may see an error message. To continue using the Web Tools APIs, all requests must be made using the secure HTTPS endpoints listed below. Integrators currently using an unsecure HTTP endpoint should transition as soon as possible to the appropriate secure HTTPS endpoint below to prevent any loss of service. This change will impact only the API endpoints; the API request and response schemas will not change.

Environment | Unsecure | HTTP Endpoint Retirement Date | New Secure HTTPS Endpoint
TEST | http://stg-production.shippingapis.com | 06/24/2021 | https://stg-production.shippingapis.com
PROD | http://production.shippingapis.com | 06/24/2021 | https://production.shippingapis.com

The endpoint is defined in app/code/core/Mage/Usa/Model/Shipping/Carrier/Usps.php

magento-lts/app/code/core/Mage/Usa/Model/Shipping/Carrier/Usps.php

Line 115 in 7526749

protected $_defaultGatewayUrl = 'http://production.shippingapis.com/ShippingAPI.dll';

and app/code/core/Mage/Usa/etc/config.xml

magento-lts/app/code/core/Mage/Usa/etc/config.xml

Line 197 in 7526749

<gateway_url>http://production.shippingapis.com/ShippingAPI.dll</gateway_url>

Steps to reproduce (*)

N/A

Expected result (*)

USPS gateway endpoint URL should be updated to HTTPS schema: https://production.shippingapis.com prior to June 24, 2021.

Actual result (*)

N/A