6

I have form which is submitted via GET method. The problem is that after submit the URL looks very bad, with lots of parameters like form_build_id & form_token. How can I get rid of them? Thanks

  • Why you do not use POST method ? I think some parameters like form_build_id and form_token should not be removed. – Sithu Aug 3 '12 at 6:31
  • I have no validation & no submit functions. I just needed to add some parameters to the url, that's it – Marius Ilie Aug 3 '12 at 9:11
  • Related: drupal.org/node/821932 – rooby Oct 12 '16 at 21:18
6

I ended up doing this:

$form = drupal_get_form('my_form_id');
unset($form['form_build_id']);
unset($form['form_id']);
unset($form['form_token']);
  • 1
    I'd be very careful about doing this. The docs have a comment that all three of those values are needed for form processing and validation. The last value is used to protect against CSRF so is a potential security risk (depending on what the link does). The form cache won't work without form_build_id, and I don't know what other problems might occur! – Andy Aug 3 '12 at 8:09
  • I don't think they matter for forms submitted via GET. Anyway, I have no validation or submit functions, I just needed to add some params to the url, that's it – Marius Ilie Aug 3 '12 at 8:47
  • 1
    It doesn't do anything, just adds the params to the url – Marius Ilie Aug 3 '12 at 9:57
  • 1
    But presumably at some point something's using those params yeah? The question is what are they used for? – Andy Aug 3 '12 at 10:07
  • 1
    A little late but an example of where this may be needed is when creating a custom form that is used as a 'search block'. This search block uses the 'get' method and sends the request to view. No updates or creation. – Amarjit Apr 13 '16 at 12:28
3

These values shouldn't be needed for GET forms, but might be. Using POST instead is not a suitable fix, that has other side effects.

According to the specs:

  • GET should be used to change the content of the page displayed
  • POST should be used to pass data or instructions to the server

A POST request should therefore be treated with care, as you might use it for something like adding an answer to a question. You don't want to accidentally send that answer twice, or it will show on the site twice - that's why browsers will warn you when you reload a page that you sent POSTDATA to. You also don't want another site to pretend to be you and answer a question on your behalf (that's called XSRF or cross-site request forgery).

These variables are included to protect against these dangers of POST, but they are not necessary if you are doing a (read-only) GET request. Other advantages of using GET at that the response can be cached, bookmarked and indexed by search engines.

A final warning: although you're not meant to change anything as the result of a GET request, there's nothing stopping you from doing so. That's probably why Drupal includes this protection.

2

Following what views does with the views_exposed_form you can easily do this to hide form_build_id form_token and form_id. Considering views is one of the top contrib modules I would say this is pretty safe:

/**
 * Implement hook_form_alter for the exposed form.
 *
 * Since the exposed form is a GET form, we don't want it to send a wide
 * variety of information.
 */
function MYMODULE_form_MY_FORM_ID_alter(&$form, &$form_state) {
  $form['form_build_id']['#access'] = FALSE;
  $form['form_token']['#access'] = FALSE;
  $form['form_id']['#access'] = FALSE;
}

See views.module and views_exposed_form() and views_form_views_exposed_form_alter()

0

Following worked for me...

function mymodule_form(&$form_state){
  // Form fields go here....
  // Then...
  $form['#token'] = false;
  // You have to call it in after_build
  $form['#after_build'] = array('_unset_form_elements');
  return $form;
}

function _unset_form_elements($form){
  unset($form['#build_id'], $form['form_build_id'], $form['form_id']);
  return $form;
}

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