Cannot modify header information - headers already sent by (output started at /app/blog/web/app/plugins/wp-stateless/vendor/symfony/finder/Iterator/FilenameFilterIterator.php:21) (500 Internal Server Error)

Exception

ErrorException

in /app/blog/web/wp/wp-includes/rest-api/class-wp-rest-server.php (line 1802)

* Any LWS that occurs between field-content MAY be replaced with a
* single SP before interpreting the field value or forwarding the
* message downstream.
*/
$value = preg_replace('/\s+/', ' ', $value);
header(sprintf('%s: %s', $key, $value));
}
/**
* Sends multiple HTTP headers.
*

in /app/blog/vendor/roots/acorn/src/Roots/Acorn/Bootstrap/HandleExceptions.php -> handleError (line 54)

* @throws \ErrorException
*/
public function handleError($level, $message, $file = '', $line = 0, $context = [])
{
try {
parent::handleError($level, $message, $file, $line, $context);
} catch (Throwable $e) {
if (! apply_filters('acorn/throw_error_exception', true, $e)) {
return false;
}

HandleExceptions->handleError()

header() in /app/blog/web/wp/wp-includes/rest-api/class-wp-rest-server.php (line 1802)

* Any LWS that occurs between field-content MAY be replaced with a
* single SP before interpreting the field value or forwarding the
* message downstream.
*/
$value = preg_replace('/\s+/', ' ', $value);
header(sprintf('%s: %s', $key, $value));
}
/**
* Sends multiple HTTP headers.
*

WP_REST_Server->send_header() in /app/blog/web/wp/wp-includes/rest-api/class-wp-rest-server.php (line 320)

if (isset($_GET['_jsonp'])) {
$jsonp_callback = $_GET['_jsonp'];
}
$content_type = ($jsonp_callback && $jsonp_enabled) ? 'application/javascript' : 'application/json';
$this->send_header('Content-Type', $content_type.'; charset='.get_option('blog_charset'));
$this->send_header('X-Robots-Tag', 'noindex');
$api_root = get_rest_url();
if (! empty($api_root)) {
$this->send_header('Link', '<'.sanitize_url($api_root).'>; rel="https://api.w.org/"');

WP_REST_Server->serve_request() in /app/blog/web/wp/wp-includes/rest-api.php (line 419)

// Fire off the request.
$route = untrailingslashit($GLOBALS['wp']->query_vars['rest_route']);
if (empty($route)) {
$route = '/';
}
$server->serve_request($route);
// We're done.
exit();
}

rest_api_loaded() in /app/blog/web/wp/wp-includes/class-wp-hook.php (line 318)

// Avoid the array_slice() if possible.
if ($the_['accepted_args'] == 0) {
$value = call_user_func($the_['function']);
} elseif ($the_['accepted_args'] >= $num_args) {
$value = call_user_func_array($the_['function'], $args);
} else {
$value = call_user_func_array($the_['function'], array_slice($args, 0, (int) $the_['accepted_args']));
}
}
} while (next($this->iterations[$nesting_level]) !== false);

WP_Hook->apply_filters() in /app/blog/web/wp/wp-includes/class-wp-hook.php (line 343)

* @param array $args Parameters to pass to the callback functions.
*/
public function do_action($args)
{
$this->doing_action = true;
$this->apply_filters('', $args);
// If there are recursive calls to the current action, we haven't finished it until we get to the last one.
if (! $this->nesting_level) {
$this->doing_action = false;
}

WP_Hook->do_action() in /app/blog/web/wp/wp-includes/plugin.php (line 573)

if (! isset($wp_filter['all'])) {
$wp_current_filter[] = $hook_name;
}
$wp_filter[$hook_name]->do_action($args);
array_pop($wp_current_filter);
}
/**

do_action_ref_array() in /app/blog/web/wp/wp-includes/class-wp.php (line 412)

*
* @since 2.1.0
*
* @param WP $wp Current WordPress environment instance (passed by reference).
*/
do_action_ref_array('parse_request', [&$this]);
return true;
}
/**

WP->parse_request() in /app/blog/web/wp/wp-includes/class-wp.php (line 800)

*/
public function main($query_args = '')
{
$this->init();
$parsed = $this->parse_request($query_args);
if ($parsed) {
$this->query_posts();
$this->handle_404();
$this->register_globals();

WP->main() in /app/blog/web/wp/wp-includes/functions.php (line 1369)

*/
function wp($query_vars = '')
{
global $wp, $wp_query, $wp_the_query;
$wp->main($query_vars);
if (! isset($wp_the_query)) {
$wp_the_query = $wp_query;
}
}

wp() in /app/blog/web/wp/wp-blog-header.php (line 13)

// Load the WordPress library.
require_once __DIR__.'/wp-load.php';
// Set up the WordPress query.
wp();
// Load the theme template.
require_once ABSPATH.WPINC.'/template-loader.php';
}

require('/app/blog/web/wp/wp-blog-header.php') in /app/blog/web/index.php (line 6)

<?php
/**
* WordPress View Bootstrapper
*/
define('WP_USE_THEMES', true);
require __DIR__.'/wp/wp-blog-header.php';

Stack Trace

ErrorException
ErrorException: Cannot modify header information - headers already sent by (output started at /app/blog/web/app/plugins/wp-stateless/vendor/symfony/finder/Iterator/FilenameFilterIterator.php:21) at /app/blog/web/wp/wp-includes/rest-api/class-wp-rest-server.php:1802 at Illuminate\Foundation\Bootstrap\HandleExceptions->handleError() (/app/blog/vendor/roots/acorn/src/Roots/Acorn/Bootstrap/HandleExceptions.php:54) at Roots\Acorn\Bootstrap\HandleExceptions->handleError() at header() (/app/blog/web/wp/wp-includes/rest-api/class-wp-rest-server.php:1802) at WP_REST_Server->send_header() (/app/blog/web/wp/wp-includes/rest-api/class-wp-rest-server.php:320) at WP_REST_Server->serve_request() (/app/blog/web/wp/wp-includes/rest-api.php:419) at rest_api_loaded() (/app/blog/web/wp/wp-includes/class-wp-hook.php:318) at WP_Hook->apply_filters() (/app/blog/web/wp/wp-includes/class-wp-hook.php:343) at WP_Hook->do_action() (/app/blog/web/wp/wp-includes/plugin.php:573) at do_action_ref_array() (/app/blog/web/wp/wp-includes/class-wp.php:412) at WP->parse_request() (/app/blog/web/wp/wp-includes/class-wp.php:800) at WP->main() (/app/blog/web/wp/wp-includes/functions.php:1369) at wp() (/app/blog/web/wp/wp-blog-header.php:13) at require('/app/blog/web/wp/wp-blog-header.php') (/app/blog/web/index.php:6)

ErrorException

ErrorException:
Cannot modify header information - headers already sent by (output started at /app/blog/web/app/plugins/wp-stateless/vendor/symfony/finder/Iterator/FilenameFilterIterator.php:21)

  at /app/blog/web/wp/wp-includes/rest-api/class-wp-rest-server.php:1802
  at Illuminate\Foundation\Bootstrap\HandleExceptions->handleError()
     (/app/blog/vendor/roots/acorn/src/Roots/Acorn/Bootstrap/HandleExceptions.php:54)
  at Roots\Acorn\Bootstrap\HandleExceptions->handleError()
  at header()
     (/app/blog/web/wp/wp-includes/rest-api/class-wp-rest-server.php:1802)
  at WP_REST_Server->send_header()
     (/app/blog/web/wp/wp-includes/rest-api/class-wp-rest-server.php:320)
  at WP_REST_Server->serve_request()
     (/app/blog/web/wp/wp-includes/rest-api.php:419)
  at rest_api_loaded()
     (/app/blog/web/wp/wp-includes/class-wp-hook.php:318)
  at WP_Hook->apply_filters()
     (/app/blog/web/wp/wp-includes/class-wp-hook.php:343)
  at WP_Hook->do_action()
     (/app/blog/web/wp/wp-includes/plugin.php:573)
  at do_action_ref_array()
     (/app/blog/web/wp/wp-includes/class-wp.php:412)
  at WP->parse_request()
     (/app/blog/web/wp/wp-includes/class-wp.php:800)
  at WP->main()
     (/app/blog/web/wp/wp-includes/functions.php:1369)
  at wp()
     (/app/blog/web/wp/wp-blog-header.php:13)
  at require('/app/blog/web/wp/wp-blog-header.php')
     (/app/blog/web/index.php:6)

Symfony Exception

ErrorException

HTTP 500 Internal Server Error

Cannot modify header information - headers already sent by (output started at /app/blog/web/app/plugins/wp-stateless/vendor/symfony/finder/Iterator/FilenameFilterIterator.php:21)

Exception

ErrorException

Stack Trace