Not working over SSL

Getting this error when trying to run the script over a secure connection.

[blocked] The page at 'http://blaaah.com' was loaded over HTTPS, 
but ran insecure content from 
'http://mylist.us3.list-manage1.com/subscribe/post-json?
u=04f8c1cd24075695174280554_1393032436879&
EMAIL=email%40gmail.com&_=1393032436880': 
this content should also be loaded over HTTPS.

When I try to prefix with https it also fails, and says it was trying to submit a GET request, which seems strange.

[i3inary]

$('#region-signup-form').ajaxChimp({
    url: 'https://mylist.us3.list-manage.com/subscribe/post?u=af7e4.......a03&id=2b.....7c'
});

[joshreisner]

@jprichardson helped me and I wasn’t even using the plugin. I was getting ERR_INSECURE_RESPONSE on a homegrown AJAX script for a Shopify theme. Removing the 1 fixed it for me. Appreciate it.