if(isset($_REQUEST['vid']) ){

    $id=$_REQUEST['vid'];

    $post_title = 'sasa';

    $post_content ='zxczxczxc';

    $new_post = array(
      'ID' => '',
      'post_author' => $user->ID,
      'post_content' => $post_content,
      'post_title' => $post_title,
      'post_status' => 'publish',
      // NOW IT'S ALREADY AN ARRAY

    );

    $post_id = wp_insert_post($new_post);

    // This will redirect you to the newly created post
    $post = get_post($post_id);
    $url=$post->guid;

    wp_redirect($post->guid);

}

//..... code as in question
$post_id = wp_insert_post($new_post);
$url = get_permalink( $post_id );
wp_redirect($url);
exit();

<?php
/**
 * .. Template comments
 */

 get_header();

 if(...) {
    ...
    if(...) {
      ...
      wp_redirect($url);
      exit();
    }
 }
 ?>

<?php
/**
 * .. Template comments
 */


 if(...) {
    ...
    if(...) {
      ...
      wp_redirect($url);
      exit();
    }
 }
 get_header();
 ?>

wp_redirect( get_permalink( $post_id ) );
exit(); // always exit

$url = 'http://example.com';
wp_redirect($url);
exit();

wp_redirect(get_permalink($post->ID));
exit;