safari 11.1 https to http post method trouble

We are encountering the same problem also.

Happening since iOS 11.3.

Using Safari, we open a page served over HTTPS. From this page, we submit a HTML form to a HTTP URL. We get a prompt "This form is not secure. Are you sure you want to submit it?". After clicking submit on the prompt, safari is stuck on the same page. This happens when submitting the from using both post and get.

When I submit from HTTPS to HTTPS, safari loads the next page correctly.

But, when submitting from HTTPS to HTTP, safari does not load the next page after confirming the prompt.

What happens when you try? More information would help.

we meet the same problem

Please explain exactly what you are trying to do. In order for someone to help, more information would help.