Confirm form resubmission?

Question

Browsers

Hello!
Made a search engine. I write a word there, it finds it in the database and displays it.
For example, like this (something could not load the picture):
Found 2 matches
1. The Green Bridge Institute will be created at KazNITU
2. How do they “make” their career. The experience of graduates of the Institute of Geology and Oil and Gas. K. Turysova (all this is clickable, that is, a href = "") is registered.
Next, I go into some information found, it opens.
And now when I click on the back button in chrome, an error is displayed:
Confirm the resubmission of the form
For the correct display of the web page, the data entered earlier is required. They can be sent again, but in this case, all actions on the page will be performed again.
And I want to display that found information again.
If I refresh the page, everything is displayed normally again.
Made via POST.
What else needs to be written in order for everything to work. Thank you!