TYPO3 - 404 custom page never display, only 400 - typo3

Question

Below my website configuration :
TYPO3 6.2
RealURL
I have a www.mysite.com/404/ page, that's work perfectly.
BUT TYPO3 never redirect to it when an error appears, I get a 400 Bad Request page.
I already did :
edit my localconf.php
edit via the "All Configuration" back-end module
Edit the realurl_conf.php
What am I missing ?

Answer 1

I always have something like (in realurl_conf.php):
$TYPO3_CONF_VARS['FE']['pageNotFound_handling'] = 'index.php?id=35';
$TYPO3_CONF_VARS['FE']['pageNotFound_handling_statheader'] = 'HTTP/1.0 404 Not Found';
Hope it helps :)
UPDATE:
<?php
$GLOBALS['TYPO3_CONF_VARS']['EXTCONF']['realurl'] = array (
'_DEFAULT' => array (
'init' => array (
'enableCHashCache' => '1',
'appendMissingSlash' => 'ifNotFile',
'enableUrlDecodeCache' => '1',
'enableUrlEncodeCache' => '1',
),
'redirects' => array (
),
'preVars' => array (
'0' => array (
'GETvar' => 'no_cache',
'valueMap' => array (
'nc' => '1',
),
'noMatch' => 'bypass'
),
'1' => array (
'GETvar' => 'L',
'valueMap' => array (
'nl' => '0',
'en' => '2',
'de' => '1',
),
'noMatch' => 'bypass',
),
'2' => array (
'GETvar' => 'lang',
'valueMap' => array (
'de' => 'de',
'en' => 'en',
'nl' => 'nl'
),
'noMatch' => 'bypass',
),
),
'pagePath' => array (
'type' => 'user',
'userFunc' => 'EXT:realurl/class.tx_realurl_advanced.php:&tx_realurl_advanced->main',
'spaceCharacter' => '-',
'languageGetVar' => 'L',
'expireDays' => '7',
'rootpage_id' => $rootpageId,
),
'fixedPostVars' => array(
'newsDetailConfiguration' => array(
array(
'GETvar' => 'tx_news_pi1[action]',
'valueMap' => array(
'detail' => '',
),
'noMatch' => 'bypass'
),
array(
'GETvar' => 'tx_news_pi1[controller]',
'valueMap' => array(
'News' => '',
),
'noMatch' => 'bypass'
),
array(
'GETvar' => 'tx_news_pi1[news]',
'lookUpTable' => array(
'table' => 'tx_news_domain_model_news',
'id_field' => 'uid',
'alias_field' => 'title',
'addWhereClause' => ' AND NOT deleted',
'useUniqueCache' => 1,
'useUniqueCache_conf' => array(
'strtolower' => 1,
'spaceCharacter' => '-'
),
'languageGetVar' => 'L',
'languageExceptionUids' => '',
'languageField' => 'sys_language_uid',
'transOrigPointerField' => 'l10n_parent',
'autoUpdate' => 1,
'expireDays' => 180,
)
)
),
'newsCategoryConfiguration' => array(
array(
'GETvar' => 'tx_news_pi1[overwriteDemand][categories]',
'lookUpTable' => array(
'table' => 'sys_category',
'id_field' => 'uid',
'alias_field' => 'title',
'addWhereClause' => ' AND NOT deleted',
'useUniqueCache' => 1,
'useUniqueCache_conf' => array(
'strtolower' => 1,
'spaceCharacter' => '-'
)
)
)
),
'newsTagConfiguration' => array(
array(
'GETvar' => 'tx_news_pi1[overwriteDemand][tags]',
'lookUpTable' => array(
'table' => 'tx_news_domain_model_tag',
'id_field' => 'uid',
'alias_field' => 'title',
'addWhereClause' => ' AND NOT deleted',
'useUniqueCache' => 1,
'useUniqueCache_conf' => array(
'strtolower' => 1,
'spaceCharacter' => '-'
)
)
)
),
'CompanyDetailConfiguration' => array(
array(
'GETvar' => 'tx_dswmediacompanies_companies[action]',
'valueMap' => array(
'detail' => '',
),
'noMatch' => 'bypass'
),
array(
'GETvar' => 'tx_dswmediacompanies_companies[controller]',
'valueMap' => array(
'Companies' => '',
),
'noMatch' => 'bypass'
),
array(
'GETvar' => 'tx_dswmediacompanies_companies[uid]',
'lookUpTable' => array(
'table' => 'tx_dswmediacompanies_domain_model_companies',
'id_field' => 'uid',
'alias_field' => 'name',
'addWhereClause' => ' AND NOT deleted',
'useUniqueCache' => 1,
'useUniqueCache_conf' => array(
'strtolower' => 1,
'spaceCharacter' => '-'
),
'languageGetVar' => 'L',
'languageExceptionUids' => '',
'languageField' => 'sys_language_uid',
'transOrigPointerField' => 'l10n_parent',
'autoUpdate' => 1,
'expireDays' => 180,
)
)
),
'15' => 'newsDetailConfiguration',
),
'postVarSets' => array (
'_DEFAULT' => array (
'b' => array (
array (
'GETvar' => 'tx_example[uid]',
'lookUpTable' => array (
'table' => 'tx_dswmediacompanies_domain_model_companies',
'id_field' => 'uid',
'alias_field' => 'name',
'addWhereClause' => ' AND NOT deleted',
'useUniqueCache' => '1',
'useUniqueCache_conf' => array (
'strtolower' => '1',
'spaceCharacter' => '-',
),
),
),
array (
'GETvar' => 'tx_example[action]',
'lookUpTable' => array (
'table' => 'tx_example_domain_model_companies',
'id_field' => 'uid',
'alias_field' => 'name',
'addWhereClause' => ' AND NOT deleted',
'useUniqueCache' => '1',
'useUniqueCache_conf' => array (
'strtolower' => '1',
'spaceCharacter' => '-',
),
),
),
),
'controller' => array(
array(
'GETvar' => 'tx_news_pi1[action]',
'noMatch' => 'bypass'
),
array(
'GETvar' => 'tx_news_pi1[controller]',
'noMatch' => 'bypass'
)
),
'dateFilter' => array(
array(
'GETvar' => 'tx_news_pi1[overwriteDemand][year]',
),
array(
'GETvar' => 'tx_news_pi1[overwriteDemand][month]',
),
),
'page' => array(
array(
'GETvar' => 'tx_news_pi1[#widget_0][currentPage]',
),
),
// 'news' => array (
// 0 => array (
// 'GETvar' => 'tx_news_pi1[news]',
// 'lookUpTable' => array (
// 'table' => 'tx_news_domain_model_news',
// 'id_field' => 'uid',
// 'alias_field' => 'title',
// 'useUniqueCache' => 1,
// 'useUniqueCache_conf' => array (
// 'strtolower' => 1,
// 'spaceCharacter' => '-',
// ),
// ),
// ),
// ),
),
),
'fileName' => array (
'defaultToHTMLsuffixOnPrev' => false,
'index' => array (
'rss.xml' => array (
'keyValues' => array (
'type' => '100',
),
),
'rss2.xml' => array (
'keyValues' => array (
'type' => '101',
),
),
'rdf.xml' => array (
'keyValues' => array (
'type' => '102',
),
),
'atom.xml' => array (
'keyValues' => array (
'type' => '103',
),
),
'sitemap.xml' => array (
'keyValues' => array (
'type' => '841132',
),
),
'robots.txt' => array (
'keyValues' => array (
'type' => '841133',
),
),
),
),
),
);
switch($_SERVER['HTTP_HOST']) {
case 'example.nl':
case 'www.example.nl':
$TYPO3_CONF_VARS['FE']['pageNotFound_handling'] = 'index.php?id=4';
$TYPO3_CONF_VARS['FE']['pageNotFound_handling_statheader'] = 'HTTP/1.0 404 Not Found';
$rootpageId = 1;
break;
case 'othersite.nl':
case 'www.othersite.nl':
$TYPO3_CONF_VARS['FE']['pageNotFound_handling'] = 'index.php?id=68';
$TYPO3_CONF_VARS['FE']['pageNotFound_handling_statheader'] = 'HTTP/1.0 404 Not Found';
$rootpageId = 23;
break;
}
?>