Error: Form responses must redirect to another location with Firefox

2

I notice that this happens wherever the action of the form is the same route as show page.

I found this problem when I want to redirect to index page after a successful create.
And this only happens when I use Firefox, but not in Chrome.

Adding created status will make the redirection work for me:

redirect_to posts_path, status: :created

But for update, i just add a random param to the path to make the url different , for example:

redirect_to post_path(@post, redirecting: true)
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