Plugin Author
Dan
(@dangoodman)
The error means the plugin can’t reach the USPS API server.
It might be a temporary network connectivity issue. However, if you still see the error, please check your WordPress setup for WP_HTTP_BLOCK_EXTERNAL and WP_ACCESSIBLE_HOSTS settings.
WP_HTTP_BLOCK_EXTERNAL is not set thus the whitelist for WP_ACCESSIBLE_HOSTS is not set either in the wordpress config file.
And the crash is still occurring.
The problem is there’s a hard crash and the cart is then corrupted and inaccessible if the API connection is down. Your error checking should provide a graceful fail if you get an error reply out of the API.