如何仅回复我们的网络表单

This may be a generic question.

I have a web form on my web server at example.com. Data is posted (POST) to a PHP page which returns some data.

But how to prevent my PHP page to respond to any copy of the form hosted anywhere ?

secure form

I know HTTP_REFERER is a bad idea as it can be changed client side. I thought about a JSON Web Token (JWT) in a hidden field but it can be scraped from the form page and used in the localhost form.

Is there a secured way for this problem ?

No.

Nothing beyond the edge of your webserver is under your control.

Anyone can submit any HTTP request they like, using whatever client they like (including a telnet client into which they type raw HTTP commands).

An Anti-CSRF token (which is what you appear to be going for with JWT) can prevent a third party from tricking a logged-in user from submitting a bad request: but that's the best you are going to get.

You are thinking about CRSF Token - but it can be scrapped by curl and used in any other form. As @Quentin mentioned - it only will get harder to use by others - not secure You at all.

I partially disagree with @quentin's answer.

You can create unique token via php, save it on server side and pass it to an obfuscated js code block. The obfuscated js will then write the token to a COOKIE or local storage that will be used to match against the server token on form submission, needless to say that clients without js enabled (curl, wget, etc...) won't be able to run this code.
The point of having an obfuscated js instead of regular js is to prevent clients without js to scrap our webpage, steal the unique token and use it to submit the form posing as a valid user, as mentioned on @bigwolks's answer.
Make sure the token in valid only for a limited amount of time to prevent reuse.
This setup needs customization to fit each particular project, but it has proven to be a valid defensive measure against automated submissions from non js clients on my projects.

Obfuscated js example:

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PS: Not all JavaScript obfuscators are effective. I've found obfuscator.io to be one of the best due the high number of options, specially the Domain lock and Debug Protection options.
According to the creator, It's "impossible" to revert the obfuscated code (please read the comments regarding "impossible"):

enter image description here

</div>