{"id":289,"date":"2010-06-04T15:15:29","date_gmt":"2010-06-04T13:15:29","guid":{"rendered":"http:\/\/grummfy.be\/blog\/?p=289"},"modified":"2010-06-04T15:08:07","modified_gmt":"2010-06-04T13:08:07","slug":"reecriture-durl-et-erreur-interne-a-apache","status":"publish","type":"post","link":"https:\/\/grummfy.be\/blog\/289","title":{"rendered":"R\u00e9\u00e9criture d’url et erreur interne \u00e0 Apache"},"content":{"rendered":"

Il arrive que lors de l’\u00e9criture d’un nombre complexe de r\u00e8gle de r\u00e9\u00e9criture d’URL (URL rewriting), des erreurs se produisent sans pour autant \u00eatre compr\u00e9hensibles. Je vous propose donc de regarder comment d\u00e9boguer cela \u00e0 travers un exemple pratique.<\/p>\n

Exemple<\/h2>\n

Prenons une r\u00e8gles qui v\u00e9rifierait que seul certains type de caract\u00e8re sont autoris\u00e9s.
\nLa r\u00e9\u00e9criture quant \u00e0 elle se fait sur toute URL.
\nAjoutons un document 403 personnalis\u00e9
\nRewriteEngine on
\n#
\nRewriteCond %{THE_REQUEST} !^[A-Z]{3,9}\\ [a-zA-Z0-9\\.\\+_\/\\-\\?\\=\\&]+\\ HTTP\/ [NC]
\nRewriteRule .* - [F,NS,L]
\n#
\n#if not a dir or a file
\nRewriteCond %{REQUEST_FILENAME} !-f
\nRewriteCond %{REQUEST_FILENAME} !-d
\n#
\nRewriteRule ^(.*)$ index.php?p=$1 [QSA,L]
\nErrorDocument 403 \/erreur\/403
\n<\/code>
\nTestons l’URL http:\/\/localhost\/test:s et on obtient un beau :<\/p>\n

Forbidden<\/p>\n

You don’t have permission to access \/test:s on this server.<\/p>\n

Additionally, a 500 Internal Server Error error was encountered while trying to use an ErrorDocument to handle the request.<\/p><\/blockquote>\n

Les logs d’erreurs d’Apache vous diront certainement quelque chose du genre :<\/p>\n

[error] [client 127.0.0.1] Request exceeded the limit of 10 internal redirects due to probable configuration error. Use ‘LimitInternalRecursion’ to increase the limit if necessary. Use ‘LogLevel debug’ to get a backtrace.<\/p><\/blockquote>\n

Passage en mode debug de Apache<\/h2>\n

Modifions la r\u00e8gle de log du site courant (soit dans \/etc\/apache2\/sites-available\/default soit dans \/etc\/apache2\/apache.conf ou l’\u00e9quivalent suivant votre configuration ou OS) et modifions la directive \u00ab\u00a0LogLevel warn\u00a0\u00bb<\/em> en \u00ab\u00a0LogLevel debug\u00a0\u00bb<\/em>. Ceci ne change rien dans notre cas, mais parfois cela s’av\u00e8re utile…<\/p>\n

Ajoutons ensuite les log1<\/a><\/sup> de r\u00e9\u00e9criture d’url (moi je l’ai ajouter dans \/etc\/apache2\/mods-available\/rewrite.conf puis j’ai fait un a2enmod rewrite (car le fichier .conf n’existait pas) et enfin j’ai relancer Apache) :
\n<IfModule mod_rewrite.c>
\nRewriteLog \"\/var\/log\/apache2\/rewrite.log\"
\nRewriteLogLevel 9
\n<\/IfModule><\/code><\/p>\n

Maintenant si vous aller voir dans error.log vous aurez :<\/p>\n

[error] [client 127.0.0.1] Request exceeded the limit of 10 internal redirects due to probable configuration error. Use ‘LimitInternalRecursion’ to increase the limit if necessary. Use ‘LogLevel debug’ to get a backtrace.
\n[debug] core.c(3063): [client 127.0.0.1] r->uri = \/…\/erreur\/403
\n[debug] core.c(3069): [client 127.0.0.1] redirected from r->uri = \/…\/erreur\/403
\n[debug] core.c(3069): [client 127.0.0.1] redirected from r->uri = \/…\/erreur\/403
\n[debug] core.c(3069): [client 127.0.0.1] redirected from r->uri = \/…\/erreur\/403
\n[debug] core.c(3069): [client 127.0.0.1] redirected from r->uri = \/…\/erreur\/403
\n[debug] core.c(3069): [client 127.0.0.1] redirected from r->uri = \/…\/erreur\/403
\n[debug] core.c(3069): [client 127.0.0.1] redirected from r->uri = \/…\/erreur\/403
\n[debug] core.c(3069): [client 127.0.0.1] redirected from r->uri = \/…\/erreur\/403
\n[debug] core.c(3069): [client 127.0.0.1] redirected from r->uri = \/…\/erreur\/403
\n[debug] core.c(3069): [client 127.0.0.1] redirected from r->uri = \/…\/erreur\/403
\n[debug] core.c(3069): [client 127.0.0.1] redirected from r->uri = \/…\/test:s<\/p><\/blockquote>\n

Donc on voit que la redirection s’effectue correctement mais qu’il \u00ab\u00a0n’accroche<\/em>\u00a0\u00bb pas. Regardons donc les logs de la r\u00e9\u00e9criture d’URL (rewrite.log) :<\/p>\n

\/initial] (3) [perdir \/…\/] strip per-dir prefix: \/…\/test:s -> test:s
\n\/initial] (3) [perdir \/…\/] applying pattern ‘.*’ to uri ‘test:s’
\n\/initial] (4) [perdir \/…\/] RewriteCond: input=\u00a0\u00bb pattern=’200′ => not-matched
\n\/initial] (3) [perdir \/…\/] strip per-dir prefix: \/…\/test:s -> test:s
\n\/initial] (3) [perdir \/…\/] applying pattern ‘.*’ to uri ‘test:s’
\n\/initial] (4) [perdir \/…\/] RewriteCond: input=’GET \/…\/test:s HTTP\/1.1′ pattern=’!^[A-Z]{3,9}\\ [a-zA-Z0-9\\.\\+_\/\\-\\?\\=\\&]+\\ HTTP\/’ [NC] => matched
\n\/initial] (2) [perdir \/…\/] forcing responsecode 403 for \/…\/test:s
\n\/initial\/redir#1] (3) [perdir \/…\/] add path info postfix: \/…\/erreur -> \/…\/erreur\/403
\n\/initial\/redir#1] (3) [perdir \/…\/] strip per-dir prefix: \/…\/erreur\/403 -> erreur\/403
\n\/initial\/redir#1] (3) [perdir \/…\/] applying pattern ‘.*’ to uri ‘erreur\/403′
\n\/initial\/redir#1] (4) [perdir \/…\/] RewriteCond: input=’403′ pattern=’200’ => not-matched
\n\/initial\/redir#1] (3) [perdir \/…\/] add path info postfix: \/…\/erreur -> \/…\/erreur\/403
\n\/initial\/redir#1] (3) [perdir \/…\/] strip per-dir prefix: \/…\/erreur\/403 -> erreur\/403
\n\/initial\/redir#1] (3) [perdir \/…\/] applying pattern ‘.*’ to uri ‘erreur\/403′
\n\/initial\/redir#1] (4) [perdir \/…\/] RewriteCond: input=’GET \/…\/test:s HTTP\/1.1′ pattern=’!^[A-Z]{3,9}\\ [a-zA-Z0-9\\.\\+_\/\\-\\?\\=\\&]+\\ HTTP\/’ [NC] => matched
\n\/initial\/redir#1] (2) [perdir \/…\/] forcing responsecode 403 for \/…\/erreur
\n\/initial\/redir#2] (3) [perdir \/…\/] add path info postfix: \/…\/erreur -> \/…\/erreur\/403
\n\/initial\/redir#2] (3) [perdir \/…\/] strip per-dir prefix: \/…\/erreur\/403 -> erreur\/403
\n\/initial\/redir#2] (3) [perdir \/…\/] applying pattern ‘.*’ to uri ‘erreur\/403′
\n\/initial\/redir#2] (4) [perdir \/…\/] RewriteCond: input=’403′ pattern=’200’ => not-matched
\n\/initial\/redir#2] (3) [perdir \/…\/] add path info postfix: \/…\/erreur -> \/…\/erreur\/403
\n\/initial\/redir#2] (3) [perdir \/…\/] strip per-dir prefix: \/…\/erreur\/403 -> erreur\/403
\n\/initial\/redir#2] (3) [perdir \/…\/] applying pattern ‘.*’ to uri ‘erreur\/403′
\n\/initial\/redir#2] (4) [perdir \/…\/] RewriteCond: input=’GET \/…\/test:s HTTP\/1.1′ pattern=’!^[A-Z]{3,9}\\ [a-zA-Z0-9\\.\\+_\/\\-\\?\\=\\&]+\\ HTTP\/’ [NC] => matched
\n\/initial\/redir#2] (2) [perdir \/…\/] forcing responsecode 403 for \/…\/erreur
\n\/initial\/redir#3] (3) [perdir \/…\/] add path info postfix: \/…\/erreur -> \/…\/erreur\/403
\n\/initial\/redir#3] (3) [perdir \/…\/] strip per-dir prefix: \/…\/erreur\/403 -> erreur\/403
\n\/initial\/redir#3] (3) [perdir \/…\/] applying pattern ‘.*’ to uri ‘erreur\/403′
\n\/initial\/redir#3] (4) [perdir \/…\/] RewriteCond: input=’403′ pattern=’200’ => not-matched
\n\/initial\/redir#3] (3) [perdir \/…\/] add path info postfix: \/…\/erreur -> \/…\/erreur\/403
\n\/initial\/redir#3] (3) [perdir \/…\/] strip per-dir prefix: \/…\/erreur\/403 -> erreur\/403
\n\/initial\/redir#3] (3) [perdir \/…\/] applying pattern ‘.*’ to uri ‘erreur\/403′
\n\/initial\/redir#3] (4) [perdir \/…\/] RewriteCond: input=’GET \/…\/test:s HTTP\/1.1′ pattern=’!^[A-Z]{3,9}\\ [a-zA-Z0-9\\.\\+_\/\\-\\?\\=\\&]+\\ HTTP\/’ [NC] => matched
\n\/initial\/redir#3] (2) [perdir \/…\/] forcing responsecode 403 for \/…\/erreur
\n\/initial\/redir#4] (3) [perdir \/…\/] add path info postfix: \/…\/erreur -> \/…\/erreur\/403
\n\/initial\/redir#4] (3) [perdir \/…\/] strip per-dir prefix: \/…\/erreur\/403 -> erreur\/403
\n\/initial\/redir#4] (3) [perdir \/…\/] applying pattern ‘.*’ to uri ‘erreur\/403′
\n\/initial\/redir#4] (4) [perdir \/…\/] RewriteCond: input=’403′ pattern=’200’ => not-matched
\n\/initial\/redir#4] (3) [perdir \/…\/] add path info postfix: \/…\/erreur -> \/…\/erreur\/403
\n\/initial\/redir#4] (3) [perdir \/…\/] strip per-dir prefix: \/…\/erreur\/403 -> erreur\/403
\n\/initial\/redir#4] (3) [perdir \/…\/] applying pattern ‘.*’ to uri ‘erreur\/403′
\n\/initial\/redir#4] (4) [perdir \/…\/] RewriteCond: input=’GET \/…\/test:s HTTP\/1.1′ pattern=’!^[A-Z]{3,9}\\ [a-zA-Z0-9\\.\\+_\/\\-\\?\\=\\&]+\\ HTTP\/’ [NC] => matched
\n\/initial\/redir#4] (2) [perdir \/…\/] forcing responsecode 403 for \/…\/erreur
\n\/initial\/redir#5] (3) [perdir \/…\/] add path info postfix: \/…\/erreur -> \/…\/erreur\/403
\n\/initial\/redir#5] (3) [perdir \/…\/] strip per-dir prefix: \/…\/erreur\/403 -> erreur\/403
\n\/initial\/redir#5] (3) [perdir \/…\/] applying pattern ‘.*’ to uri ‘erreur\/403′
\n\/initial\/redir#5] (4) [perdir \/…\/] RewriteCond: input=’403′ pattern=’200’ => not-matched
\n\/initial\/redir#5] (3) [perdir \/…\/] add path info postfix: \/…\/erreur -> \/…\/erreur\/403
\n\/initial\/redir#5] (3) [perdir \/…\/] strip per-dir prefix: \/…\/erreur\/403 -> erreur\/403
\n\/initial\/redir#5] (3) [perdir \/…\/] applying pattern ‘.*’ to uri ‘erreur\/403′
\n\/initial\/redir#5] (4) [perdir \/…\/] RewriteCond: input=’GET \/…\/test:s HTTP\/1.1′ pattern=’!^[A-Z]{3,9}\\ [a-zA-Z0-9\\.\\+_\/\\-\\?\\=\\&]+\\ HTTP\/’ [NC] => matched
\n\/initial\/redir#5] (2) [perdir \/…\/] forcing responsecode 403 for \/…\/erreur
\n\/initial\/redir#6] (3) [perdir \/…\/] add path info postfix: \/…\/erreur -> \/…\/erreur\/403
\n\/initial\/redir#6] (3) [perdir \/…\/] strip per-dir prefix: \/…\/erreur\/403 -> erreur\/403
\n\/initial\/redir#6] (3) [perdir \/…\/] applying pattern ‘.*’ to uri ‘erreur\/403′
\n\/initial\/redir#6] (4) [perdir \/…\/] RewriteCond: input=’403′ pattern=’200’ => not-matched
\n\/initial\/redir#6] (3) [perdir \/…\/] add path info postfix: \/…\/erreur -> \/…\/erreur\/403
\n\/initial\/redir#6] (3) [perdir \/…\/] strip per-dir prefix: \/…\/erreur\/403 -> erreur\/403
\n\/initial\/redir#6] (3) [perdir \/…\/] applying pattern ‘.*’ to uri ‘erreur\/403′
\n\/initial\/redir#6] (4) [perdir \/…\/] RewriteCond: input=’GET \/…\/test:s HTTP\/1.1′ pattern=’!^[A-Z]{3,9}\\ [a-zA-Z0-9\\.\\+_\/\\-\\?\\=\\&]+\\ HTTP\/’ [NC] => matched
\n\/initial\/redir#6] (2) [perdir \/…\/] forcing responsecode 403 for \/…\/erreur
\n\/initial\/redir#7] (3) [perdir \/…\/] add path info postfix: \/…\/erreur -> \/…\/erreur\/403
\n\/initial\/redir#7] (3) [perdir \/…\/] strip per-dir prefix: \/…\/erreur\/403 -> erreur\/403
\n\/initial\/redir#7] (3) [perdir \/…\/] applying pattern ‘.*’ to uri ‘erreur\/403′
\n\/initial\/redir#7] (4) [perdir \/…\/] RewriteCond: input=’403′ pattern=’200’ => not-matched
\n\/initial\/redir#7] (3) [perdir \/…\/] add path info postfix: \/…\/erreur -> \/…\/erreur\/403
\n\/initial\/redir#7] (3) [perdir \/…\/] strip per-dir prefix: \/…\/erreur\/403 -> erreur\/403
\n\/initial\/redir#7] (3) [perdir \/…\/] applying pattern ‘.*’ to uri ‘erreur\/403′
\n\/initial\/redir#7] (4) [perdir \/…\/] RewriteCond: input=’GET \/…\/test:s HTTP\/1.1′ pattern=’!^[A-Z]{3,9}\\ [a-zA-Z0-9\\.\\+_\/\\-\\?\\=\\&]+\\ HTTP\/’ [NC] => matched
\n\/initial\/redir#7] (2) [perdir \/…\/] forcing responsecode 403 for \/…\/erreur
\n\/initial\/redir#8] (3) [perdir \/…\/] add path info postfix: \/…\/erreur -> \/…\/erreur\/403
\n\/initial\/redir#8] (3) [perdir \/…\/] strip per-dir prefix: \/…\/erreur\/403 -> erreur\/403
\n\/initial\/redir#8] (3) [perdir \/…\/] applying pattern ‘.*’ to uri ‘erreur\/403′
\n\/initial\/redir#8] (4) [perdir \/…\/] RewriteCond: input=’403′ pattern=’200’ => not-matched
\n\/initial\/redir#8] (3) [perdir \/…\/] add path info postfix: \/…\/erreur -> \/…\/erreur\/403
\n\/initial\/redir#8] (3) [perdir \/…\/] strip per-dir prefix: \/…\/erreur\/403 -> erreur\/403
\n\/initial\/redir#8] (3) [perdir \/…\/] applying pattern ‘.*’ to uri ‘erreur\/403′
\n\/initial\/redir#8] (4) [perdir \/…\/] RewriteCond: input=’GET \/…\/test:s HTTP\/1.1′ pattern=’!^[A-Z]{3,9}\\ [a-zA-Z0-9\\.\\+_\/\\-\\?\\=\\&]+\\ HTTP\/’ [NC] => matched
\n\/initial\/redir#8] (2) [perdir \/…\/] forcing responsecode 403 for \/…\/erreur
\n\/initial\/redir#9] (3) [perdir \/…\/] add path info postfix: \/…\/erreur -> \/…\/erreur\/403
\n\/initial\/redir#9] (3) [perdir \/…\/] strip per-dir prefix: \/…\/erreur\/403 -> erreur\/403
\n\/initial\/redir#9] (3) [perdir \/…\/] applying pattern ‘.*’ to uri ‘erreur\/403′
\n\/initial\/redir#9] (4) [perdir \/…\/] RewriteCond: input=’403′ pattern=’200’ => not-matched
\n\/initial\/redir#9] (3) [perdir \/…\/] add path info postfix: \/…\/erreur -> \/…\/erreur\/403
\n\/initial\/redir#9] (3) [perdir \/…\/] strip per-dir prefix: \/…\/erreur\/403 -> erreur\/403
\n\/initial\/redir#9] (3) [perdir \/…\/] applying pattern ‘.*’ to uri ‘erreur\/403′
\n\/initial\/redir#9] (4) [perdir \/…\/] RewriteCond: input=’GET \/…\/test:s HTTP\/1.1′ pattern=’!^[A-Z]{3,9}\\ [a-zA-Z0-9\\.\\+_\/\\-\\?\\=\\&]+\\ HTTP\/’ [NC] => matched
\n\/initial\/redir#9] (2) [perdir \/…\/] forcing responsecode 403 for \/…\/erreur
\n\/initial\/redir#10] (3) [perdir \/…\/] add path info postfix: \/…\/erreur -> \/…\/erreur\/403
\n\/initial\/redir#10] (3) [perdir \/…\/] strip per-dir prefix: \/…\/erreur\/403 -> erreur\/403
\n\/initial\/redir#10] (3) [perdir \/…\/] applying pattern ‘.*’ to uri ‘erreur\/403′
\n\/initial\/redir#10] (4) [perdir \/…\/] RewriteCond: input=’403′ pattern=’200’ => not-matched
\n\/initial\/redir#10] (3) [perdir \/…\/] add path info postfix: \/…\/erreur -> \/…\/erreur\/403
\n\/initial\/redir#10] (3) [perdir \/…\/] strip per-dir prefix: \/…\/erreur\/403 -> erreur\/403
\n\/initial\/redir#10] (3) [perdir \/…\/] applying pattern ‘.*’ to uri ‘erreur\/403′
\n\/initial\/redir#10] (4) [perdir \/…\/] RewriteCond: input=’GET \/…\/test:s HTTP\/1.1′ pattern=’!^[A-Z]{3,9}\\ [a-zA-Z0-9\\.\\+_\/\\-\\?\\=\\&]+\\ HTTP\/’ [NC] => matched
\n\/initial\/redir#10] (2) [perdir \/…\/] forcing responsecode 403 for \/…\/erreur<\/p><\/blockquote>\n

En gros, nous avions une boucle de redirection. Pour l’\u00e9viter ajoutons,d ans le .htaccess, une condition qui dira de ne pas rentrer dans le bloc, s’il y a une erreur 403 :
\nRewriteEngine on
\n#
\nRewriteCond %{ENV:REDIRECT_STATUS} !403
\nRewriteCond %{THE_REQUEST} !^[A-Z]{3,9}\\ [a-zA-Z0-9\\.\\+_\/\\-\\?\\=\\&]+\\ HTTP\/ [NC]
\nRewriteRule .* - [F,NS,L]
\n#
\n#if not a dir or a file
\nRewriteCond %{REQUEST_FILENAME} !-f
\nRewriteCond %{REQUEST_FILENAME} !-d
\n#
\nRewriteRule ^(.*)$ index.php?p=$1 [QSA,L]
\nErrorDocument 403 \/erreur\/403
\n<\/code>
\nMaintenant tout fonctionne comme pr\u00e9vu!<\/p>\n

La fin<\/h2>\n

Pour finir, ceci montre encore l’importance des logs lors de la rencontre de probl\u00e8me. S’il y a moyen penser a les activer, cela simplifie franchement la t\u00e2che de d\u00e9bogage que cela soit pour Apache mais aussi pour tout projet informatique.<\/p>\n

Un dernier conseil, pensez a d\u00e9sactiver le mode debug de Apache une fois fini!<\/p>\n

S’il y avait un site a conseiller sur ce sujet (en dehors du manuel Apache) je vous renverrait vers askapache<\/a><\/p>\n

\n
<\/div>\n
    \n
  1. Si le fichier ne se cr\u00e9er pas tout seul penser \u00e0 le cr\u00e9er ↩<\/a><\/span><\/li>\n<\/ol>\n<\/div>\n","protected":false},"excerpt":{"rendered":"

    Il arrive que lors de l’\u00e9criture d’un nombre complexe de r\u00e8gle de r\u00e9\u00e9criture d’URL, des erreurs se produisent. Passons au d\u00e9bogage de celles-ci.<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"webmentions_disabled_pings":false,"webmentions_disabled":false,"footnotes":""},"categories":[9],"tags":[36,97,101,100,37],"class_list":["post-289","post","type-post","status-publish","format-standard","hentry","category-dev","tag-apache","tag-deboguage","tag-serveur","tag-url-rewriting","tag-web"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t