{"id":301,"date":"2026-08-23T09:18:58","date_gmt":"2026-08-23T09:18:58","guid":{"rendered":"https:\/\/devmath.fr\/blog\/powershell-download-url\/"},"modified":"2026-08-23T09:18:58","modified_gmt":"2026-08-23T09:18:58","slug":"powershell-download-url","status":"publish","type":"post","link":"https:\/\/devmath.fr\/blog\/powershell-download-url\/","title":{"rendered":"Powershell download file from URL : tutoriel pour d\u00e9butants"},"content":{"rendered":"<p class=\"wp-block-paragraph\">Manipuler PowerShell pour automatiser le t\u00e9l\u00e9chargement de fichiers via une URL s\u2019impose comme une comp\u00e9tence accessible m\u00eame aux d\u00e9butants. Ce tutoriel d\u00e9montre comment, gr\u00e2ce \u00e0 quelques cmdlets int\u00e9gr\u00e9s, r\u00e9cup\u00e9rer des fichiers rapidement, qu\u2019il s\u2019agisse d\u2019un simple document ou d\u2019un gros volume de donn\u00e9es, tout en ma\u00eetrisant les nuances comme la gestion des erreurs et l\u2019optimisation des performances. Loin de la complexit\u00e9 apparente, ces m\u00e9thodes offrent un terrain d\u2019apprentissage progressif et riche pour aborder plus sereinement l\u2019univers des scripts PowerShell et la gestion automatis\u00e9e de fichiers. L\u2019importance de ces savoir-faire s\u2019inscrit aussi dans la capacit\u00e9 \u00e0 automatiser des t\u00e2ches r\u00e9p\u00e9titives, un enjeu majeur pour les professionnels du num\u00e9rique et les passionn\u00e9s d\u2019informatique.<\/p>\n\n<p class=\"wp-block-paragraph\"><div class=\"en-bref\">\n<h3 style=\"margin-top:0px !important; padding-top:0px !important;\"> L&rsquo;article en bref<\/h3>\n<p>Ce guide propose des solutions claires et d\u00e9taill\u00e9es pour t\u00e9l\u00e9charger des fichiers via PowerShell en toute simplicit\u00e9 et fiabilit\u00e9, adapt\u00e9es aux d\u00e9butants.<\/p>\n<ul>\n<li> <strong>Choix adapt\u00e9 selon le contexte :<\/strong> M\u00e9thodes vari\u00e9es selon la taille et la nature du fichier<\/li>\n<li> <strong>Commandes cl\u00e9s \u00e0 conna\u00eetre :<\/strong> Invoke-WebRequest, Start-BitsTransfer, WebClient<\/li>\n<li> <strong>Conseils pratiques :<\/strong> Progression, gestion des erreurs et optimisation des t\u00e9l\u00e9chargements<\/li>\n<li> <strong>Approche p\u00e9dagogique :<\/strong> Pas \u00e0 pas et astuces concr\u00e8tes pour \u00e9viter les erreurs fr\u00e9quentes<\/li>\n<\/ul>\n<p> Ce tutoriel invite \u00e0 un apprentissage progressif qui facilite l&rsquo;automatisation efficace du t\u00e9l\u00e9chargement de fichiers avec PowerShell.<\/p>\n<\/div><\/p>\n\n<h2 class=\"wp-block-heading\">Comprendre les bases du t\u00e9l\u00e9chargement de fichier avec PowerShell<\/h2>\n\n<p class=\"wp-block-paragraph\">Au c\u0153ur des nombreuses possibilit\u00e9s offertes par PowerShell figure la capacit\u00e9 \u00e0 t\u00e9l\u00e9charger des fichiers depuis une <strong>URL<\/strong> via la ligne de commande, un v\u00e9ritable gain de temps. L\u2019une des cmdlets les plus utilis\u00e9es est <strong>Invoke-WebRequest<\/strong>, qui permet de r\u00e9cup\u00e9rer un fichier en sp\u00e9cifiant simplement son adresse web et le chemin de destination local. Ce processus est particuli\u00e8rement utile pour les <strong>d\u00e9butants en informatique<\/strong> qui souhaitent automatiser des t\u00e2ches sans recourir \u00e0 des navigateurs.<\/p>\n\n<p class=\"wp-block-paragraph\">L\u2019usage de la commande se r\u00e9sume \u00e0:<\/p>\n\n<ul class=\"wp-block-list\"><li>Sp\u00e9cifier l\u2019URL source du fichier<\/li><li>D\u00e9finir l\u2019emplacement d\u2019enregistrement sur le disque local<\/li><li>Ex\u00e9cuter le script, en contr\u00f4lant ou non la progression du t\u00e9l\u00e9chargement<\/li><\/ul>\n\n<p class=\"wp-block-paragraph\">Une astuce essentielle consiste \u00e0 int\u00e9grer l\u2019option <code>-UseBasicParsing<\/code> dans Invoke-WebRequest pour \u00e9viter le parsing HTML inutile, ce qui am\u00e9liore la rapidit\u00e9 et la stabilit\u00e9 du t\u00e9l\u00e9chargement, notamment sur des syst\u00e8mes o\u00f9 Internet Explorer est peu ou pas initialis\u00e9.<\/p>\n\n<h3 class=\"wp-block-heading\">Invoke-WebRequest : la commande incontournable pour vos premiers scripts<\/h3>\n\n<p class=\"wp-block-paragraph\"><strong>Invoke-WebRequest<\/strong> est le premier r\u00e9flexe pour t\u00e9l\u00e9charger des fichiers dans PowerShell. Sa simplicit\u00e9 masque une gestion avanc\u00e9e des redirections, des cookies et des en-t\u00eates HTTP personnalis\u00e9s. Par exemple, pour t\u00e9l\u00e9charger un fichier, la commande suit ce mod\u00e8le :<\/p>\n\n<pre class=\"wp-block-code\"><pre><code>Invoke-WebRequest -Uri \"https:\/\/example.com\/fichier.zip\" -OutFile \"C:Tempfichier.zip\" -UseBasicParsing<\/code><\/pre><\/pre>\n\n<p class=\"wp-block-paragraph\">Cette m\u00e9thode \u00e9vite de charger la totalit\u00e9 du fichier en m\u00e9moire, ce qui est un avantage pour la gestion de fichiers volumineux. Une erreur fr\u00e9quente chez les d\u00e9butants est d\u2019oublier <code>-UseBasicParsing<\/code>, ce qui peut entra\u00eener des lenteurs ou des erreurs inattendues.<\/p>\n\n<figure class=\"is-provider-youtube is-type-video wp-block-embed wp-block-embed-youtube wp-embed-aspect-16-9 wp-has-aspect-ratio\"><div class=\"wp-block-embed__wrapper\">\n<iframe loading=\"lazy\" title=\"Update-Help in PowerShell: Download &amp; Update Help Files for Offline Use | PowerShell Tutorial\" width=\"500\" height=\"281\" src=\"https:\/\/www.youtube.com\/embed\/D5w7bAP1Ij0?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe>\n<\/div><\/figure>\n\n<h2 class=\"wp-block-heading\">G\u00e9rer les t\u00e9l\u00e9chargements volumineux avec Start-BitsTransfer<\/h2>\n\n<p class=\"wp-block-paragraph\">Lorsque la taille des fichiers \u00e0 t\u00e9l\u00e9charger d\u00e9passe quelques centaines de m\u00e9gaoctets, la commande <strong>Start-BitsTransfer<\/strong> s\u2019impose. Ce service Windows sp\u00e9cialis\u00e9 dans le transfert intelligent en arri\u00e8re-plan permet :<\/p>\n\n<ul class=\"wp-block-list\"><li>La r\u00e9silience face aux interruptions r\u00e9seau<\/li><li>La limitation de la bande passante utilis\u00e9e afin de ne pas perturber les autres activit\u00e9s<\/li><li>La possibilit\u00e9 d\u2019ex\u00e9cuter le t\u00e9l\u00e9chargement en t\u00e2che de fond sans bloquer l\u2019interface<\/li><\/ul>\n\n<p class=\"wp-block-paragraph\">La syntaxe simple d\u2019utilisation pour un t\u00e9l\u00e9chargement peut \u00eatre ainsi :<\/p>\n\n<pre class=\"wp-block-code\"><pre><code>Start-BitsTransfer -Source \"https:\/\/example.com\/grosfichier.iso\" -Destination \"C:Tempgrosfichier.iso\"<\/code><\/pre><\/pre>\n\n<p class=\"wp-block-paragraph\">Pour un usage plus avanc\u00e9, il est possible d&rsquo;effectuer un transfert asynchrone, un point important \u00e0 conna\u00eetre pour une automatisation fluide :<\/p>\n\n<pre class=\"wp-block-code\"><pre><code>$job = Start-BitsTransfer -Source \"https:\/\/example.com\/grosfichier.iso\" `\n-Destination \"C:Tempgrosfichier.iso\" `\n-Asynchronous\nwhile ($job.JobState -eq \"Transferring\") {\n    Write-Output \"T\u00e9l\u00e9charg\u00e9 : $($job.BytesTransferred \/ 1MB) MB\"\n    Start-Sleep -Seconds 5\n}\nComplete-BitsTransfer -BitsJob $job<\/code><\/pre><\/pre>\n\n<figure class=\"is-provider-youtube is-type-video wp-block-embed wp-block-embed-youtube wp-embed-aspect-16-9 wp-has-aspect-ratio\"><div class=\"wp-block-embed__wrapper\">\n<iframe loading=\"lazy\" title=\"How to Download Documents using Powershell\" width=\"500\" height=\"375\" src=\"https:\/\/www.youtube.com\/embed\/XwroehlY6vg?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe>\n<\/div><\/figure>\n\n<h3 class=\"wp-block-heading\">Comparer les m\u00e9thodes principales en fonction du contexte d\u2019utilisation<\/h3>\n\n<p class=\"wp-block-paragraph\">Selon les besoins en automatisation et les caract\u00e9ristiques des fichiers \u00e0 t\u00e9l\u00e9charger, plusieurs options sont disponibles. Pour \u00e9clairer ces choix, voici un tableau comparatif des quatre principales m\u00e9thodes :<\/p>\n\n<figure class=\"wp-block-table\"><table>\n<thead>\n<tr>\n<th>M\u00e9thode<\/th>\n<th>Type de fichier<\/th>\n<th>Avantages<\/th>\n<th>Limitations<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Invoke-WebRequest<\/td>\n<td>Fichiers petits \u00e0 moyens<\/td>\n<td>Simple, gestion des redirections et cookies<\/td>\n<td>Moins rapide pour tr\u00e8s gros fichiers<\/td>\n<\/tr>\n<tr>\n<td>WebClient .DownloadFile()<\/td>\n<td>Tous types, particuli\u00e8rement gros fichiers<\/td>\n<td>Rapide, l\u00e9ger, faible m\u00e9moire utilis\u00e9e<\/td>\n<td>Pas de barre de progression int\u00e9gr\u00e9e<\/td>\n<\/tr>\n<tr>\n<td>Start-BitsTransfer<\/td>\n<td>Gros fichiers, transfert en arri\u00e8re-plan<\/td>\n<td>R\u00e9silient aux coupures, contr\u00f4le de bande passante<\/td>\n<td>Service BITS doit \u00eatre actif et disponible<\/td>\n<\/tr>\n<tr>\n<td>Invoke-RestMethod<\/td>\n<td>API REST, donn\u00e9es JSON\/XML<\/td>\n<td>Parse automatiquement la r\u00e9ponse en objet PowerShell<\/td>\n<td>Moins adapt\u00e9 pour les fichiers binaires classiques<\/td>\n<\/tr>\n<\/tbody>\n<\/table><\/figure>\n\n<h2 class=\"wp-block-heading\">Ajouter robustesse et contr\u00f4le avec des scripts de t\u00e9l\u00e9chargement avanc\u00e9s<\/h2>\n\n<p class=\"wp-block-paragraph\">Pour rendre les scripts plus fiables, notamment dans un environnement r\u00e9seau instable, impl\u00e9menter des tentatives de r\u00e9essai en cas d\u2019\u00e9chec am\u00e9liore consid\u00e9rablement la r\u00e9ussite du t\u00e9l\u00e9chargement. Voici un script illustrant ce principe :<\/p>\n\n<pre class=\"wp-block-code\"><pre><code>function Invoke-DownloadWithRetry {\n    param(\n        [string]$Uri,\n        [string]$OutFile,\n        [int]$MaxRetries = 3\n    )\n    for ($attempt = 1; $attempt -le $MaxRetries; $attempt++) {\n        try {\n            Invoke-WebRequest -Uri $Uri -OutFile $OutFile -UseBasicParsing -ErrorAction Stop\n            Write-Output \"T\u00e9l\u00e9charg\u00e9 avec succ\u00e8s \u00e0 la tentative $attempt\"\n            return\n        } catch {\n            Write-Warning \"Tentative $attempt \u00e9chou\u00e9e : $_\"\n            Start-Sleep -Seconds ($attempt * 5)\n        }\n    }\n    throw \"\u00c9chec apr\u00e8s $MaxRetries tentatives : $Uri\"\n}\nInvoke-DownloadWithRetry -Uri \"https:\/\/example.com\/fichier.zip\" -OutFile \"C:Tempfichier.zip\"<\/code><\/pre><\/pre>\n\n<p class=\"wp-block-paragraph\">Pour un public d\u00e9butant, comprendre ce m\u00e9canisme profite \u00e0 la fois \u00e0 l\u2019apprentissage des boucles et \u00e0 la gestion d\u2019erreurs.<\/p>\n\n<h2 class=\"wp-block-heading\">Outillage compl\u00e9mentaire et bonnes pratiques pour le t\u00e9l\u00e9chargement automatique<\/h2>\n\n<p class=\"wp-block-paragraph\">Outre les cmdlets PowerShell principales, divers outils disponibles en ligne de commande peuvent enrichir la gestion des t\u00e9l\u00e9chargements :<\/p>\n\n<ul class=\"wp-block-list\"><li><strong>curl<\/strong> : rapide et efficace, particuli\u00e8rement appr\u00e9ci\u00e9 par les habitu\u00e9s de la ligne de commande.<\/li><li><strong>wget<\/strong> : un classique l\u00e9ger, utile pour des r\u00e9cup\u00e9rations simples et rapides.<\/li><li><strong>certutil<\/strong> : normalement destin\u00e9 aux certificats, il peut aussi servir pour des t\u00e9l\u00e9chargements lorsque d\u2019autres outils sont absents.<\/li><\/ul>\n\n<p class=\"wp-block-paragraph\">Une vigilance utile pour \u00e9viter les erreurs fr\u00e9quentes consiste \u00e0 v\u00e9rifier l\u2019existence du fichier avant de lancer un t\u00e9l\u00e9chargement, et \u00e0 d\u00e9sactiver les barres de progression intrusives qui ralentissent parfois le processus. La personnalisation via les en-t\u00eates HTTP, notamment pour des authentifications par jeton, ouvre encore plus de possibilit\u00e9s.<\/p>\n\n<p class=\"wp-block-paragraph\">Ces accents pratiques se compl\u00e8tent avec des ressources p\u00e9dagogiques. Un exemple ludique en lien avec l\u2019usage de PowerShell est la personnalisation du curseur sous Windows et Mac, propos\u00e9e sur <a href=\"https:\/\/devmath.fr\/blog\/changer-curseur-windows-mac\/\">ce site<\/a>, pour d\u00e9couvrir progressivement la manipulation des configurations syst\u00e8me.<\/p>\n\n<figure class=\"is-provider-youtube is-type-video wp-block-embed wp-block-embed-youtube wp-embed-aspect-16-9 wp-has-aspect-ratio\"><div class=\"wp-block-embed__wrapper\">\n<iframe loading=\"lazy\" title=\"t\u00e9l\u00e9charger les fichiers via Power Shell\" width=\"500\" height=\"281\" src=\"https:\/\/www.youtube.com\/embed\/PP-dHHOb00k?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe>\n<\/div><\/figure>\n\n<script type=\"application\/ld+json\">\n{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"Comment afficher la progression du2019un tu00e9lu00e9chargement dans PowerShell ?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Invoke-WebRequest propose une barre de progression par du00e9faut, mais elle peut ralentir le transfert. Utiliser WebClient avec lu2019u00e9vu00e9nement DownloadProgressChanged permet un suivi plus fluide et performant.\"}},{\"@type\":\"Question\",\"name\":\"Peut-on automatiser le tu00e9lu00e9chargement de fichiers protu00e9gu00e9s par authentification ?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Oui. Il suffit du2019ajouter des en-tu00eates HTTP personnalisu00e9s, comme un jeton du2019autorisation, u00e0 la commande Invoke-WebRequest pour gu00e9rer lu2019authentification dans le script PowerShell.\"}},{\"@type\":\"Question\",\"name\":\"Que faire si Start-BitsTransfer ne fonctionne pas ?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Le service BITS peut u00eatre du00e9sactivu00e9 ou absent sur certaines configurations, particuliu00e8rement dans des environnements lu00e9gers ou conteneurisu00e9s. Dans ce cas, privilu00e9giez Invoke-WebRequest ou WebClient.\"}},{\"@type\":\"Question\",\"name\":\"Quelle est la diffu00e9rence entre Invoke-WebRequest et Invoke-RestMethod ?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Invoke-RestMethod est conu00e7u pour interagir avec des API REST et parser automatiquement les donnu00e9es JSON ou XML, alors quu2019Invoke-WebRequest est plus adaptu00e9 pour ru00e9cupu00e9rer des fichiers binaires classiques.\"}},{\"@type\":\"Question\",\"name\":\"Comment u00e9viter de tu00e9lu00e9charger un fichier du00e9ju00e0 existant ?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Avant de lancer un tu00e9lu00e9chargement, le script peut vu00e9rifier si le fichier existe avec Test-Path ; si oui, le tu00e9lu00e9chargement peut u00eatre ignoru00e9 pour gagner du temps.\"}}]}\n<\/script>\n<h3>Comment afficher la progression d\u2019un t\u00e9l\u00e9chargement dans PowerShell ?<\/h3>\n<p>Invoke-WebRequest propose une barre de progression par d\u00e9faut, mais elle peut ralentir le transfert. Utiliser WebClient avec l\u2019\u00e9v\u00e9nement DownloadProgressChanged permet un suivi plus fluide et performant.<\/p>\n<h3>Peut-on automatiser le t\u00e9l\u00e9chargement de fichiers prot\u00e9g\u00e9s par authentification ?<\/h3>\n<p>Oui. Il suffit d\u2019ajouter des en-t\u00eates HTTP personnalis\u00e9s, comme un jeton d\u2019autorisation, \u00e0 la commande Invoke-WebRequest pour g\u00e9rer l\u2019authentification dans le script PowerShell.<\/p>\n<h3>Que faire si Start-BitsTransfer ne fonctionne pas ?<\/h3>\n<p>Le service BITS peut \u00eatre d\u00e9sactiv\u00e9 ou absent sur certaines configurations, particuli\u00e8rement dans des environnements l\u00e9gers ou conteneuris\u00e9s. Dans ce cas, privil\u00e9giez Invoke-WebRequest ou WebClient.<\/p>\n<h3>Quelle est la diff\u00e9rence entre Invoke-WebRequest et Invoke-RestMethod ?<\/h3>\n<p>Invoke-RestMethod est con\u00e7u pour interagir avec des API REST et parser automatiquement les donn\u00e9es JSON ou XML, alors qu\u2019Invoke-WebRequest est plus adapt\u00e9 pour r\u00e9cup\u00e9rer des fichiers binaires classiques.<\/p>\n<h3>Comment \u00e9viter de t\u00e9l\u00e9charger un fichier d\u00e9j\u00e0 existant ?<\/h3>\n<p>Avant de lancer un t\u00e9l\u00e9chargement, le script peut v\u00e9rifier si le fichier existe avec Test-Path ; si oui, le t\u00e9l\u00e9chargement peut \u00eatre ignor\u00e9 pour gagner du temps.<\/p>\n\n","protected":false},"excerpt":{"rendered":"<p>Manipuler PowerShell pour automatiser le t\u00e9l\u00e9chargement de fichiers via une URL s\u2019impose comme une comp\u00e9tence accessible m\u00eame aux d\u00e9butants. Ce [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":300,"comment_status":"open","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"_uag_custom_page_level_css":"","site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center 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