gcc: How to make sure form's relative URL works?

vendredi 17 avril 2015

This is my webpage


http://ift.tt/1yzQLLc

To update the product, I should submit to this URL


http://ift.tt/1JbyWCF

In the product page, I have these forms to submit data


<form method="post" action="update">
    <input type="submit" />
</form>

<form method="post" action="./update">
    <input type="submit" />
</form>

Both forms do not work, because it will submit to


http://ift.tt/1OO8tii

They only work if URL is


http://ift.tt/1yBMZ4g

If I hard code the product id in action


<form method="post" action="1/update">
    <input type="submit" />
</form>

Then http://ift.tt/1yBMZ4g will not work, because it will submit to http://ift.tt/1OO8tik

What value should the action be to make sure the form can submit to correct URL?

If it is possible, I don't want to render absolute path or product id in form action.

gcc