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Strict Standards: Declaration of Walker_CategoryDropdown::start_el() should be compatible with Walker::start_el($output) in /homepages/10/d212871047/htdocs/wp-includes/classes.php on line 678

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Deprecated: Function ereg() is deprecated in /homepages/10/d212871047/htdocs/wp-content/plugins/tantan/tantan_reports.php on line 39

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(Multipurpose Internet Mail Extensions)- introduction mime communaute de noctambules
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Strict Standards: date(): It is not safe to rely on the system's timezone settings. You are *required* to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected 'Europe/Berlin' for 'CEST/2.0/DST' instead in /homepages/10/d212871047/htdocs/wp-includes/functions.php on line 27

Strict Standards: date(): It is not safe to rely on the system's timezone settings. You are *required* to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected 'Europe/Berlin' for 'CEST/2.0/DST' instead in /homepages/10/d212871047/htdocs/wp-includes/functions.php on line 28

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Strict Standards: date(): It is not safe to rely on the system's timezone settings. You are *required* to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected 'Europe/Berlin' for 'CEST/2.0/DST' instead in /homepages/10/d212871047/htdocs/wp-includes/functions.php on line 28

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LE PROTOCOLE MIME

Introduction à MIME :

MIME (Multipurpose Internet Mail Extensions) est un standard qui a été proposé par les laboratoires Bell Communications en 1991 afin d’étendre les possibilités limitées du courrier électronique (mail) et notamment de permettre d’insérer des documents (images, sons, texte, …) dans un courrier. Il est défini à l’origine par les RFC 1341 et 1342 datant de juin 1992. MIME propose de décrire, grâce à des en-têtes, le type de contenu du message et le codage utilisé. MIME apporte à la messagerie les fonctionnalités suivantes :

* Possibilité d’avoir plusieurs objets (pièces jointes) dans un même message ;
* Une longueur de message illimitée ;
* L’utilisation de jeux de caractères (alphabets) autres que le code ASCII ;
* L’utilisation de texte enrichi (mise en forme des messages, polices de caractères, couleurs, etc.) ;
* Des pièces jointes binaires (exécutables, images, fichiers audio ou vidéo, etc.), comportant éventuellement plusieurs parties ;

MIME utilise des directives d’entête spécifiques pour décrire le format utilisé dans le corps d’un message, afin de permettre au client de messagerie de pouvoir l’interpréter correctement :

* MIME-Version: Il s’agit de version du standard MIME utilisée dans le message. Actuellement seule la version 1.0 existe.
* Content-type : Décrit le type et les sous-type des données. Il peut posséder un paramètre « charset », séparé par un point-virtule, définissant le jeu de caractères utilisé.
* Content-Transfer-Encoding : Définit l’encodage utilisé dans le corps du message.
* Content-ID : Représente un identificateur unique de partie de message.
* Content-Description : Donne des informations complémentaires sur le contenu du message.
* Content-Disposition : Définit les paramètres de la pièce jointe, notamment le nom associé au fichier grâce à l’attribut filename.

Types MIME principaux :

Le type MIME, utilisé dans l’entête Content-Type, est utilisé d’une part pour typer les documents attachés à un courrier. Un type MIME est constitué de la manière suivante :

Content-type: type_mime_principal/sous_type_mime

Une image GIF possèdera par exemple le type MIME suivant :

Content-type: image/gif

Les types principaux de données, appelés parfois « types de données discrets », sont les suivants :

* text: données textuelles lisibles. text/rfc822 [RFC822] ; text/plain [RFC2646] ; text/html [RFC2854] .
* image: données binaires représentant des images numériques image/jpeg ; image/gif ; image/png.
* audio: données numériques sonores audio/basic ; audio/wav
* video : données vidéos : video/mpeg
* application : données binaires autres. application/octet-stream ; application/pdf

Le type MIME est également utilisé sur le Web, pour typer les documents transférés par le protocole HTTP. Ainsi, lors d’une transaction entre un serveur web et un navigateur internet, le serveur web envoie en premier lieu le type MIME du fichier envoyé au navigateur, afin que ce dernier puisse savoir comment afficher le document.

En pratique, comment fonctionne MIME :

MIME prend en charge votre message électronique. Il en encode les différentes parties (texte principal, pièces jointes) et place dans l’entête les informations pour que le logiciel qui réceptionne le message puisse le décoder.

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Strict Standards: date(): It is not safe to rely on the system's timezone settings. You are *required* to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected 'Europe/Berlin' for 'CEST/2.0/DST' instead in /homepages/10/d212871047/htdocs/wp-content/plugins/math-comment-spam-protection/math-comment-spam-protection.classes.php on line 77

Strict Standards: date(): It is not safe to rely on the system's timezone settings. You are *required* to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected 'Europe/Berlin' for 'CEST/2.0/DST' instead in /homepages/10/d212871047/htdocs/wp-content/plugins/math-comment-spam-protection/math-comment-spam-protection.classes.php on line 163