Using Gravity Forms ‘gform_webhooks_request_headers’ PHP filter

The gform_webhooks_request_headers filter allows you to modify the webhook HTTP request headers.


To apply this filter to all forms:

add_filter('gform_webhooks_request_headers', 'your_function_name', 10, 4);

To target a specific form, append the form id to the hook name:

add_filter('gform_webhooks_request_headers_14', 'your_function_name', 10, 4);


  • $request_headers (array): HTTP request headers.
  • $feed (Feed Object): The feed object.
  • $entry (Entry Object): The current entry.
  • $form (Form Object): The form object.

More information

See Gravity Forms Docs: gform_webhooks_request_headers

This filter is located in GF_Webhooks::process_feed() in gravityformswebhooks/class-gf-webhooks.php.


Set the From header

Modify the ‘From’ header for the webhook request:

add_filter('gform_webhooks_request_headers', 'set_headers', 10, 4);
function set_headers($request_headers, $feed, $entry, $form) {
    $request_headers['From'] = '[email protected]';
    return $request_headers;

Set the authorization header with a bearer token

Generate and add a bearer token to the authorization header using a third-party service:

add_filter('gform_webhooks_request_headers', function ($request_headers) {
    $token = 'your_bearer_token';
    $request_headers['Authorization'] = 'Bearer ' . $token;
    return $request_headers;

Set the authorization header using JWT Library and Zoom API

Generate and add a bearer token to the authorization header using the JWT PHP Library and Zoom API:

add_filter('gform_webhooks_request_headers', function ($request_headers) {
    // Requires JWT PHP Library:
    if (class_exists('JWT')) {
        $key = '<zoom_api_key>';
        $secret = '<zoom_api_secret>';
        $token = array(
            "iss" => $key,
            "exp" => time() + 60

        $request_headers['Authorization'] = 'Bearer ' . JWT::encode($token, $secret);
    return $request_headers;

Set the Basic Authorization header

Add the Basic Authorization header to authenticate a request:

add_filter('gform_webhooks_request_headers', function ($request_headers) {
    $username = 'your_username';
    $password = 'your_password';
    $request_headers['Authorization'] = 'Basic ' . base64_encode($username . ':' . $password);
    return $request_headers;
}, 10, 2);

Note: Replace your_username and your_password with your actual credentials.