<form id = "myForm" action="localhost" method="get">
<input name="liftString" type="text">
<input type="submit">
</form>
This form doesn't do anything when clicking the submit button. I'm not redirected to localhost.
If I change the action attribute to "/localhost" it tries to take me to file:///localhost?liftString=d when running the form locally.
If I change action to "http://localhost", it correctly takes me to http://localhost/?liftString=f.
What is happening in the form example posted? Why does the form do nothing when I click submit?
CLARIFICATION: I understand what's going on when action="/localhost" and action="https://localhost". What I don't understand is why NOTHING happens when I have action="localhost".
A URL that doesn't start with a scheme (such as http://) or the scheme-relative indicator (//) is relative to the current URL (unless overridden with <base>.
So the browser takes the URL of the current page, strips off everything after the last / in it, appends the relative URL (localhost) then adds a query string after that.
Since you are using a file:// scheme to view the page, the form would submit to a file on your computer with no HTTP server to process the form data. Since the file localhost doesn't exist, the browser just ignores the form submission request instead.
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