{"id":24658,"date":"2020-02-21T00:00:00","date_gmt":"2020-02-21T00:00:00","guid":{"rendered":"https:\/\/www.mailgun.com\/blog\/cours-intensif-http\/"},"modified":"2026-09-16T16:56:22","modified_gmt":"2026-09-16T16:56:22","slug":"cours-intensif-http","status":"publish","type":"blog","link":"https:\/\/www.mailgun.com\/fr\/blog\/it-and-engineering\/cours-intensif-http\/","title":{"rendered":"Cours intensif sur HTTP"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">Cela fait un moment que nous ne nous sommes pas pench\u00e9s sur un processus technique plus fondamental, et bien que le monde de l&#8217;email soit en constante \u00e9volution, il est agr\u00e9able de prendre du recul et d&rsquo;examiner comment les choses fonctionnent. Comme l&rsquo;indique le titre, nous voulions revoir le protocole HTTP\u00a0: ce que c&rsquo;est, comment il fonctionne et ses diff\u00e9rentes fonctions aujourd&rsquo;hui. Alors accrochez-vous, il est temps de suivre un cours intensif.<\/p>\n\n\n\r\n    <nav data-content-type=\"longform\" class=\"toc-block longform-spacings px-5 py-6 px-md-6 px-lg-7 py-md-7 bg-light fs-sm rounded-lg\" aria-labelledby=\"toc-title-9864\"><p class=\"h5 m-0\" id=\"toc-title-9864\">Table des mati\u00e8res<\/p><div class=\"d-flex mt-3\"><div class=\"w-auto fw-bold text-accent d-flex me-2\">01<\/div><div class=\"d-flex flex-column\"><a class=\"fw-bold scrollme link-body-color text-accent\" href=\"#quest-ce-que-http\">Qu&rsquo;est-ce que HTTP\u00a0?<\/a><\/div><\/div><div class=\"d-flex mt-3\"><div class=\"w-auto fw-bold text-accent d-flex me-2\">02<\/div><div class=\"d-flex flex-column\"><a class=\"fw-bold scrollme link-body-color text-accent\" href=\"#http-et-les-navigateurs\">HTTP et les navigateurs<\/a><\/div><\/div><div class=\"d-flex mt-3\"><div class=\"w-auto fw-bold text-accent d-flex me-2\">03<\/div><div class=\"d-flex flex-column\"><a class=\"fw-bold scrollme link-body-color text-accent\" href=\"#le-sandboxing-http\">Le sandboxing HTTP<\/a><\/div><\/div><div class=\"d-flex mt-3\"><div class=\"w-auto fw-bold text-accent d-flex me-2\">04<\/div><div class=\"d-flex flex-column\"><a class=\"fw-bold scrollme link-body-color text-accent\" href=\"#https-et-la-securite\">HTTPS et la s\u00e9curit\u00e9<\/a><\/div><\/div><div class=\"d-flex mt-3\"><div class=\"w-auto fw-bold text-accent d-flex me-2\">05<\/div><div class=\"d-flex flex-column\"><a class=\"fw-bold scrollme link-body-color text-accent\" href=\"#a-propos-de-lauteur\">\u00c0 propos de l&rsquo;auteur<\/a><\/div><\/div><\/nav>\n\n\n<h2 class=\"wp-block-heading\">Qu&rsquo;est-ce que HTTP\u00a0?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><b>HTTP signifie Hypertext Transfer Protocol, et c&rsquo;est un m\u00e9canisme utilis\u00e9 pour transf\u00e9rer des donn\u00e9es sur Internet entre des clients (ordinateurs, portables, t\u00e9l\u00e9phones, etc.) et des serveurs.<\/b><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Ainsi, si vous allez dans la barre d&rsquo;adresse de votre navigateur et tapez une adresse web,<i> <\/i>le navigateur recherche l&rsquo;adresse du serveur associ\u00e9e \u00e0 cette URL. \u00c0 partir de l\u00e0, le navigateur tente d&rsquo;\u00e9tablir une connexion au serveur connue sous le nom de connexion TCP sur  <a href=\"\/?blog_category=http-2-cleartext-h2c-client-example-go\" target=\"_tabs\" rel=\"noopener noreferrer\"><u>HTTP<\/u><\/a> le port par d\u00e9faut du trafic\u00a0: le port 80. Si la connexion est \u00e9tablie avec le navigateur (ce qui signifie que le serveur est valide), votre navigateur envoie alors une requ\u00eate similaire \u00e0 celle-ci\u00a0:<\/p>\n\n\n    <div data-content-type=\"longform\" class=\"code-snippet longform-spacings rounded-lg overflow-hidden shadow \" data-count=\"1\">\r\n        <ul class=\"nav nav-buttons code-snippet__tabs longform-except position-relative d-flex gap-2 flex-wrap p-3\" role=\"tablist\">\r\n\r\n                            \r\n                    \r\n                        <li class=\"nav-item\" role=\"presentation\">\r\n                            <button class=\"nav-link active\" data-bs-toggle=\"tab\" data-bs-target=\"#code_0\" type=\"button\" role=\"tab\" aria-controls=\"code_0\" aria-selected=\"true\">\r\n                                PHP                            <\/button>\r\n                        <\/li>\r\n\r\n                    \r\n                            \r\n        <\/ul>\r\n        <div class=\"code-snippet__tab-content tab-content\">\r\n\r\n                            \r\n                    <div class=\"tab-pane show active\" id=\"code_0\" role=\"tabpanel\" aria-labelledby=\"code_0\">\r\n                        <div class=\"code-snippet__code-wrapper\">\r\n                            <div class=\"nav nav-buttons code-snippet__copy-wrapper\">\r\n                                <button type=\"button\" class=\"nav-link code-snippet__copy\" data-clipboard-target=\"#code_0_content\" data-clipboard-label=\"Copier dans le presse-papiers\" data-clipboard-success-label=\"Copi\u00e9\u00a0!\" data-clipboard-error-label=\"Impossible de copier\" data-tooltip=\"Copier dans le presse-papiers\" data-tooltip-placement=\"left\" role=\"tooltip\" aria-label=\"Copier dans le presse-papiers\">\r\n                                    <svg class=\"code-snippet__copy-icon code-snippet__copy-icon--default\" width=\"24\" height=\"24\" aria-hidden=\"true\" data-url=\"https:\/\/www.mailgun.com\/wp-content\/plugins\/sinch-core\/assets\/icons\/sinch\/file-stack.svg\"><\/svg>\r\n                                    <svg class=\"code-snippet__copy-icon code-snippet__copy-icon--success\" width=\"24\" height=\"24\" aria-hidden=\"true\" data-url=\"https:\/\/www.mailgun.com\/wp-content\/plugins\/sinch-core\/assets\/icons\/sinch\/badge-check.svg\"><\/svg>\r\n                                <\/button>\r\n                            <\/div>\r\n                            <pre class=\"w-100 h-100 m-0 line-numbers language-PHP\">\r\n                                <code id=\"code_0_content\" class=\"language-PHP\">\r\n\r\n                                    GET \/18_tyyp.html HTTP\/2.0\r\nHost: the web address or URL\r\nUser-Agent: The browser\u2019s name\r\n                                <\/code>\r\n                            <\/pre>\r\n                        <\/div>\r\n                    <\/div>\r\n                                    <\/div>\r\n    <\/div>\r\n\n\n\n<p class=\"wp-block-paragraph\">En utilisant la m\u00eame connexion, le serveur r\u00e9pondra alors\u00a0:<\/p>\n\n\n    <div data-content-type=\"longform\" class=\"code-snippet longform-spacings rounded-lg overflow-hidden shadow \" data-count=\"1\">\r\n        <ul class=\"nav nav-buttons code-snippet__tabs longform-except position-relative d-flex gap-2 flex-wrap p-3\" role=\"tablist\">\r\n\r\n                            \r\n                    \r\n                        <li class=\"nav-item\" role=\"presentation\">\r\n                            <button class=\"nav-link active\" data-bs-toggle=\"tab\" data-bs-target=\"#code_0\" type=\"button\" role=\"tab\" aria-controls=\"code_0\" aria-selected=\"true\">\r\n                                PHP                            <\/button>\r\n                        <\/li>\r\n\r\n                    \r\n                            \r\n        <\/ul>\r\n        <div class=\"code-snippet__tab-content tab-content\">\r\n\r\n                            \r\n                    <div class=\"tab-pane show active\" id=\"code_0\" role=\"tabpanel\" aria-labelledby=\"code_0\">\r\n                        <div class=\"code-snippet__code-wrapper\">\r\n                            <div class=\"nav nav-buttons code-snippet__copy-wrapper\">\r\n                                <button type=\"button\" class=\"nav-link code-snippet__copy\" data-clipboard-target=\"#code_0_content\" data-clipboard-label=\"Copier dans le presse-papiers\" data-clipboard-success-label=\"Copi\u00e9\u00a0!\" data-clipboard-error-label=\"Impossible de copier\" data-tooltip=\"Copier dans le presse-papiers\" data-tooltip-placement=\"left\" role=\"tooltip\" aria-label=\"Copier dans le presse-papiers\">\r\n                                    <svg class=\"code-snippet__copy-icon code-snippet__copy-icon--default\" width=\"24\" height=\"24\" aria-hidden=\"true\" data-url=\"https:\/\/www.mailgun.com\/wp-content\/plugins\/sinch-core\/assets\/icons\/sinch\/file-stack.svg\"><\/svg>\r\n                                    <svg class=\"code-snippet__copy-icon code-snippet__copy-icon--success\" width=\"24\" height=\"24\" aria-hidden=\"true\" data-url=\"https:\/\/www.mailgun.com\/wp-content\/plugins\/sinch-core\/assets\/icons\/sinch\/badge-check.svg\"><\/svg>\r\n                                <\/button>\r\n                            <\/div>\r\n                            <pre class=\"w-100 h-100 m-0 line-numbers language-PHP\">\r\n                                <code id=\"code_0_content\" class=\"language-PHP\">\r\n\r\n                                    HTTP\/2.0 200 OK\r\nContent-Length: 65635\r\nContent-Type: html\/text\r\nLast-Modified: Fri, 24 Jan 2020 08:35:42 GMT\r\n&lt;!doctype html&gt;\r\n\u2026the document&#039;s remaining part\r\n                                <\/code>\r\n                            <\/pre>\r\n                        <\/div>\r\n                    <\/div>\r\n                                    <\/div>\r\n    <\/div>\r\n\n\n\n<p class=\"wp-block-paragraph\">Le navigateur affiche son corps, la partie qui suit la ligne vide dans le document, sous forme de document HTML.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">La <code><i>requ\u00eate<\/i><\/code> est l&rsquo;information envoy\u00e9e par le client. Cela commence ainsi\u00a0:<\/p>\n\n\n    <div data-content-type=\"longform\" class=\"code-snippet longform-spacings rounded-lg overflow-hidden shadow \" data-count=\"1\">\r\n        <ul class=\"nav nav-buttons code-snippet__tabs longform-except position-relative d-flex gap-2 flex-wrap p-3\" role=\"tablist\">\r\n\r\n                            \r\n                    \r\n                        <li class=\"nav-item\" role=\"presentation\">\r\n                            <button class=\"nav-link active\" data-bs-toggle=\"tab\" data-bs-target=\"#code_0\" type=\"button\" role=\"tab\" aria-controls=\"code_0\" aria-selected=\"true\">\r\n                                PHP                            <\/button>\r\n                        <\/li>\r\n\r\n                    \r\n                            \r\n        <\/ul>\r\n        <div class=\"code-snippet__tab-content tab-content\">\r\n\r\n                            \r\n                    <div class=\"tab-pane show active\" id=\"code_0\" role=\"tabpanel\" aria-labelledby=\"code_0\">\r\n                        <div class=\"code-snippet__code-wrapper\">\r\n                            <div class=\"nav nav-buttons code-snippet__copy-wrapper\">\r\n                                <button type=\"button\" class=\"nav-link code-snippet__copy\" data-clipboard-target=\"#code_0_content\" data-clipboard-label=\"Copier dans le presse-papiers\" data-clipboard-success-label=\"Copi\u00e9\u00a0!\" data-clipboard-error-label=\"Impossible de copier\" data-tooltip=\"Copier dans le presse-papiers\" data-tooltip-placement=\"left\" role=\"tooltip\" aria-label=\"Copier dans le presse-papiers\">\r\n                                    <svg class=\"code-snippet__copy-icon code-snippet__copy-icon--default\" width=\"24\" height=\"24\" aria-hidden=\"true\" data-url=\"https:\/\/www.mailgun.com\/wp-content\/plugins\/sinch-core\/assets\/icons\/sinch\/file-stack.svg\"><\/svg>\r\n                                    <svg class=\"code-snippet__copy-icon code-snippet__copy-icon--success\" width=\"24\" height=\"24\" aria-hidden=\"true\" data-url=\"https:\/\/www.mailgun.com\/wp-content\/plugins\/sinch-core\/assets\/icons\/sinch\/badge-check.svg\"><\/svg>\r\n                                <\/button>\r\n                            <\/div>\r\n                            <pre class=\"w-100 h-100 m-0 line-numbers language-PHP\">\r\n                                <code id=\"code_0_content\" class=\"language-PHP\">\r\n\r\n                                    GET \/18_http.html HTTP\/2.0\r\n                                <\/code>\r\n                            <\/pre>\r\n                        <\/div>\r\n                    <\/div>\r\n                                    <\/div>\r\n    <\/div>\r\n\n\n\n<p class=\"wp-block-paragraph\">La m\u00e9thode de requ\u00eate d\u00e9finit le premier mot. <code><i>GET<\/i><\/code><i> <\/i>implique que la ressource que vous recherchez est sp\u00e9cifi\u00e9e. D&rsquo;autres m\u00e9thodes de requ\u00eate incluent <code><i>DELETE<\/i><\/code><i> <\/i>pour supprimer une ressource, <code><i>PUT<\/i><\/code><i> <\/i>pour remplacer ou cr\u00e9er des ressources, et <code><i>POST<\/i><\/code><i> <\/i>pour envoyer des informations \u00e0 la ressource.\u00a0<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Il est important de noter que le serveur n&rsquo;a aucune obligation de r\u00e9pondre \u00e0 toutes les requ\u00eates qui lui sont envoy\u00e9es. Cela dit, c&rsquo;est une communication assez simple.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">HTTP et les navigateurs<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Lorsque vous entrez une URL dans la barre d&rsquo;adresse d&rsquo;un navigateur, il est demand\u00e9 \u00e0 ce dernier d&rsquo;effectuer une requ\u00eate. Si la page HTML r\u00e9sultant de la requ\u00eate contient d&rsquo;autres fichiers (fichiers JavaScript, images, etc.), ils sont tous \u00e9galement r\u00e9cup\u00e9r\u00e9s et cr\u00e9ent ensemble la page que vous avez demand\u00e9e.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Certains sites web peuvent inclure entre 10 et 200 ressources. Pour r\u00e9cup\u00e9rer toutes ces ressources rapidement, le navigateur effectue plusieurs requ\u00eates <code><i>GET<\/i><\/code><i> <\/i>simultan\u00e9es au lieu d&rsquo;attendre les r\u00e9ponses l&rsquo;une apr\u00e8s l&rsquo;autre. Sinon, les pages mettraient un temps infini \u00e0 se charger correctement, et personne n&rsquo;a de temps \u00e0 perdre.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Le sandboxing HTTP<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Comme vous le savez probablement, HTTP n&rsquo;est pas le moyen de communication le plus s\u00e9curis\u00e9 au monde. Il y a de quoi s&rsquo;inqui\u00e9ter lorsqu&rsquo;on effectue une  <a href=\"https:\/\/medium.com\/better-programming\/crash-course-in-http-requests-using-python-59246373a187\" target=\"_tabs\" rel=\"noopener noreferrer\"><u>requ\u00eate HTTP<\/u><\/a>  dans le script d&rsquo;une page web. La personne en charge du script peut avoir des int\u00e9r\u00eats diff\u00e9rents de celle qui ex\u00e9cute la requ\u00eate. Par exemple, je pourrais visiter `themafia.org`, mais je ne veux pas que le script de cette page envoie une requ\u00eate \u00e0 une autre page en utilisant des informations qu&rsquo;il peut identifier depuis mon navigateur. Non pas que je m&rsquo;int\u00e9resse \u00e0 la mafia, bien s\u00fbr.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">C&rsquo;est la raison pour laquelle les navigateurs n&rsquo;autorisent pas le script d&rsquo;une page web \u00e0 faire des requ\u00eates HTTP vers un autre domaine\u00a0: cela prot\u00e8ge l&rsquo;utilisateur. Cependant, un autre probl\u00e8me se pose lorsque quelqu&rsquo;un tente de cr\u00e9er un serveur syst\u00e8me qui pourrait l\u00e9gitimement demander l&rsquo;acc\u00e8s \u00e0 d&rsquo;autres domaines. Cela se r\u00e9sout facilement lorsque le serveur int\u00e8gre un en-t\u00eate tel que celui-ci\u00a0: <i>Access-Control-Allow-Origin <\/i>dans sa r\u00e9ponse<i>. <\/i>L&rsquo;en-t\u00eate indique explicitement au navigateur d&rsquo;autoriser les requ\u00eates provenant d&rsquo;un autre domaine.\u00a0<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">HTTPS et la s\u00e9curit\u00e9<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Les donn\u00e9es peuvent parcourir un long chemin sur Internet, et l&rsquo;itin\u00e9raire qu&rsquo;elles empruntent peut \u00eatre long et dangereux. Avant d&rsquo;arriver \u00e0 destination, elles doivent traverser diff\u00e9rents \u00e9l\u00e9ments en cours de route qui peuvent inspecter ou m\u00eame modifier les donn\u00e9es.\u00a0<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Si vous voulez garder une information secr\u00e8te (comme des mots de passe) ou si vous voulez que les donn\u00e9es arrivent \u00e0 destination sans modification, alors le simple HTTP ne suffit pas.\u00a0<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Une version plus s\u00e9curis\u00e9e du  <a href=\"https:\/\/eloquentjavascript.net\/18_http.html\" target=\"_tabs\" rel=\"noopener noreferrer\"><u>protocole HTTP<\/u><\/a>  est https<i>:\/\/. <\/i>Cette URL enveloppe le trafic HTTP de telle sorte qu&rsquo;il est plus difficile de le falsifier ou de le lire. Avant l&rsquo;\u00e9change de donn\u00e9es, le client confirme d&rsquo;abord l&rsquo;authenticit\u00e9 du serveur en lui demandant de prouver qu&rsquo;il poss\u00e8de son certificat cryptographique, qui est g\u00e9n\u00e9ralement d\u00e9livr\u00e9 par une autorit\u00e9 reconnue par le navigateur. Apr\u00e8s cette \u00e9tape, toutes les donn\u00e9es qui transitent par cette connexion sont chiffr\u00e9es de sorte qu&rsquo;il est impossible de les falsifier et\/ou de les intercepter.\u00a0<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Lorsque HTTPS fonctionne bien, il emp\u00eache d&rsquo;autres personnes d&rsquo;essayer d&rsquo;usurper l&rsquo;identit\u00e9 du site web que vous essayez d&rsquo;atteindre, gardant ainsi vos donn\u00e9es en s\u00e9curit\u00e9. Il n&rsquo;est cependant pas parfait. Si un logiciel tombe en panne ou si des certificats sont vol\u00e9s, les donn\u00e9es peuvent toujours \u00eatre menac\u00e9es. N\u00e9anmoins, il est beaucoup plus s\u00fbr que le simple et bon vieux HTTP. <\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><i>\u00c0 propos de l&rsquo;auteur<\/i><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Alice Jones est une journaliste et freelance bas\u00e9e \u00e0 San Francisco qui se concentre sur  <a href=\"https:\/\/www.rushessay.com\/coursework.php\" target=\"_tabs\" rel=\"noopener noreferrer\"><u>la r\u00e9daction de travaux universitaires<\/u><\/a>  et les missions en freelance. Ses \u00e9crits portent principalement sur le commerce et le marketing, et elle a obtenu sa licence et son master \u00e0 l&rsquo;Universit\u00e9 de San Francisco.\u00a0<\/p>\n\n\n\r\n    <aside data-content-type=\"longform\"  class=\"banner-block longform-spacings rounded-lg shadow-lg px-5 py-6 px-md-6 py-md-7 p-lg-7 bg-light\" data-theme=\"dark\" aria-labelledby=\"banner-block-block_b9840a1006b44db762fc054bf06d5b64\">\r\n                    <p class=\"text-uppercase section-caption text-body-color\">\r\n                S&rsquo;inscrire            <\/p>\r\n                            <p class=\"h4 text-accent fw-bold\" id=\"banner-block-block_b9840a1006b44db762fc054bf06d5b64\">\r\n                Lancez-vous, c&rsquo;est facile ! Et c&rsquo;est gratuit.            <\/p>\r\n                            <div class=\"mb-0 text-body-color\">\r\n                                    <div class=\"content-body mb-0 text-body-color\">D\u00e9couvrez ce que vous pouvez accomplir avec la meilleure plateforme de livraison d\u2019emails au monde.<\/div>\r\n                            <\/div>\r\n        \r\n        <div class=\"text-start mt-5\"><a href=\"https:\/\/signup.mailgun.com\/new\/signup\"  class=\"btn btn-secondary\" >Get started<\/a><\/div>\r\n    <\/aside>\r\n\r\n","protected":false},"excerpt":{"rendered":"<p>HTTP signifie Hypertext Transfer Protocol, et c&rsquo;est un m\u00e9canisme utilis\u00e9 pour transf\u00e9rer des donn\u00e9es sur Internet entre des clients (ordinateurs, portables, t\u00e9l\u00e9phones, etc.) et des serveurs.<\/p>\n","protected":false},"author":13,"featured_media":4843,"menu_order":0,"template":"","meta":{"_acf_changed":true,"footnotes":""},"blog_category":[23],"class_list":["post-24658","blog","type-blog","status-publish","has-post-thumbnail","hentry","blog_category-it-and-engineering"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Cours intensif sur HTTP - Transactional Email API Service For Developers | Mailgun<\/title>\n<meta name=\"description\" content=\"Qu&#039;est-ce que HTTP et comment fonctionne-t-il\u00a0? 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