diff --git a/components/BackupList.vue b/components/BackupList.vue
index 1aa8a38..cca8806 100644
--- a/components/BackupList.vue
+++ b/components/BackupList.vue
@@ -22,6 +22,13 @@
       </div>
     </div>
 
+    <div v-else-if="errorMessage" class="empty-state error-state">
+      <IconifyIcon icon="mdi:alert-circle-outline" class="text-3xl text-m-error/70" />
+      <p class="mt-2 font-mono text-xs text-m-error/80">
+        {{ errorMessage }}
+      </p>
+    </div>
+
     <div v-else-if="backups.length === 0" class="empty-state">
       <IconifyIcon icon="mdi:file-hidden" class="text-3xl text-m-muted/40" />
       <p class="mt-2 font-mono text-xs text-m-muted/50">
@@ -63,6 +70,7 @@ const props = defineProps<{
 
 const backups = ref<string[]>([])
 const loading = ref(false)
+const errorMessage = ref("")
 const apiAuthHeader = useApiAuthHeader()
 const title = computed(() => {
   if (!props.folder) return "Fichiers"
@@ -72,25 +80,36 @@ const title = computed(() => {
 const downloadBackup = async (file: string) => {
   if (!props.folder) return
   const url = `/api/download?folder=${encodeURIComponent(props.folder)}&file=${encodeURIComponent(file)}`
-  await downloadApiFile(url, file)
+  errorMessage.value = ""
+
+  try {
+    await downloadApiFile(url, file)
+  } catch (error) {
+    console.error("Erreur telechargement backup:", error)
+    errorMessage.value = "Erreur lors de l'opération"
+  }
 }
 
 watch(() => props.folder, async (folder) => {
   if (!folder) {
     loading.value = false
     backups.value = []
+    errorMessage.value = ""
     return
   }
 
   loading.value = true
+  errorMessage.value = ""
   try {
     const data = await $fetch<string[]>(`/api/backups?folder=${encodeURIComponent(folder)}`, {
-      headers: apiAuthHeader
+      headers: apiAuthHeader,
+      server: false
     })
     backups.value = data
   } catch (error) {
     console.error("Erreur récupération backups:", error)
     backups.value = []
+    errorMessage.value = "Erreur lors de l'opération"
   } finally {
     loading.value = false
   }
@@ -124,6 +143,12 @@ watch(() => props.folder, async (folder) => {
   padding: 2.5rem 1rem;
 }
 
+.error-state {
+  border-radius: 8px;
+  border: 1px solid rgb(var(--m-error) / 0.12);
+  background: rgb(var(--m-error) / 0.06);
+}
+
 .file-list {
   display: flex;
   flex-direction: column;
diff --git a/components/BackupRun.vue b/components/BackupRun.vue
index 36b9db2..7ea5d5f 100644
--- a/components/BackupRun.vue
+++ b/components/BackupRun.vue
@@ -143,7 +143,7 @@ const loadScripts = async () => {
   } catch (error) {
     scripts.value = []
     isError.value = true
-    message.value = `Erreur chargement scripts: ${error instanceof Error ? error.message : String(error)}`
+    message.value = "Erreur lors de l'opération"
     emit("result", {
       key: null,
       label: "",
@@ -180,7 +180,7 @@ const runScript = async (key: string) => {
     })
   } catch (error: any) {
     isError.value = true
-    message.value = error?.data?.statusMessage || "Erreur execution script"
+    message.value = error?.data?.statusMessage || "Erreur lors de l'opération"
     output.value = ""
     emit("result", {
       key,
diff --git a/components/MessageDiscord.vue b/components/MessageDiscord.vue
index 6b61904..9b35026 100644
--- a/components/MessageDiscord.vue
+++ b/components/MessageDiscord.vue
@@ -2,8 +2,9 @@
 import {Icon as IconifyIcon} from "@iconify/vue"
 import { useApiAuthHeader } from "~/composables/useApiAuth"
 
-const { data: messages } = await useFetch('/api/discord/messages', {
-  headers: useApiAuthHeader()
+const { data: messages, error } = await useFetch('/api/discord/messages', {
+  headers: useApiAuthHeader(),
+  server: false
 })
 </script>
 
@@ -17,7 +18,14 @@ const { data: messages } = await useFetch('/api/discord/messages', {
       <span class="font-mono text-[10px] text-m-muted tracking-widest uppercase">Messages</span>
     </div>
 
-    <div v-if="!messages || messages.length === 0" class="empty-state">
+    <div v-if="error" class="empty-state error-state">
+      <IconifyIcon icon="mdi:alert-circle-outline" class="text-3xl text-m-error/70" />
+      <p class="mt-2 font-mono text-xs text-m-error/80">
+        Erreur lors de l'opération
+      </p>
+    </div>
+
+    <div v-else-if="!messages || messages.length === 0" class="empty-state">
       <IconifyIcon icon="mdi:chat-outline" class="text-3xl text-m-muted/40" />
       <p class="mt-2 font-mono text-xs text-m-muted/50">
         Aucun message
@@ -78,6 +86,12 @@ const { data: messages } = await useFetch('/api/discord/messages', {
   padding: 2rem 1rem;
 }
 
+.error-state {
+  border-radius: 8px;
+  border: 1px solid rgb(var(--m-error) / 0.12);
+  background: rgb(var(--m-error) / 0.06);
+}
+
 .message-list {
   display: flex;
   flex-direction: column;
diff --git a/components/Speedtest.vue b/components/Speedtest.vue
index 09872e5..cad8942 100644
--- a/components/Speedtest.vue
+++ b/components/Speedtest.vue
@@ -36,6 +36,10 @@
         </div>
       </div>
     </div>
+
+    <p v-if="errorMessage" class="error-text" role="status" aria-live="polite">
+      {{ errorMessage }}
+    </p>
   </div>
 </template>
 
@@ -48,6 +52,7 @@ const ping = ref<number | null>(null)
 const download = ref<number | null>(null)
 const upload = ref<number | null>(null)
 const isTesting = ref(false)
+const errorMessage = ref("")
 const apiAuthHeader = useApiAuthHeader()
 
 const metrics = computed(() => [
@@ -61,6 +66,9 @@ async function testDownload() {
   const res = await fetch('/api/download', {
     headers: apiAuthHeader
   })
+  if (!res.ok) {
+    throw new Error(`HTTP ${res.status}`)
+  }
   const blob = await res.blob()
   const end = performance.now()
   const size = blob.size
@@ -72,7 +80,10 @@ async function testUpload() {
   const size = 5 * 1024 * 1024
   const data = new Uint8Array(size)
   const start = performance.now()
-  await fetch('/api/upload', withApiAuth({ method: 'POST', body: data }))
+  const response = await fetch('/api/upload', withApiAuth({ method: 'POST', body: data }))
+  if (!response.ok) {
+    throw new Error(`HTTP ${response.status}`)
+  }
   const end = performance.now()
   const seconds = (end - start) / 1000
   upload.value = Math.round((size * 8) / seconds / 1000000)
@@ -80,7 +91,10 @@ async function testUpload() {
 
 async function testPing() {
   const start = performance.now()
-  await fetch('/api/ping')
+  const response = await fetch('/api/ping')
+  if (!response.ok) {
+    throw new Error(`HTTP ${response.status}`)
+  }
   const end = performance.now()
   ping.value = Math.round(end - start)
 }
@@ -90,11 +104,15 @@ async function runTests() {
   download.value = null
   upload.value = null
   ping.value = null
+  errorMessage.value = ""
 
   try {
     await testDownload()
     await testUpload()
     await testPing()
+  } catch (error) {
+    console.error("Erreur speedtest:", error)
+    errorMessage.value = "Erreur lors de l'opération"
   } finally {
     isTesting.value = false
   }
@@ -193,4 +211,15 @@ async function runTests() {
   letter-spacing: 0.1em;
   color: rgb(var(--m-muted));
 }
+
+.error-text {
+  margin-top: 0.75rem;
+  border-radius: 8px;
+  border: 1px solid rgb(var(--m-error) / 0.12);
+  background: rgb(var(--m-error) / 0.06);
+  padding: 0.75rem 0.875rem;
+  font-family: var(--font-mono);
+  font-size: 0.75rem;
+  color: rgb(var(--m-error));
+}
 </style>
diff --git a/composables/useApiAuth.ts b/composables/useApiAuth.ts
new file mode 100644
index 0000000..18b3210
--- /dev/null
+++ b/composables/useApiAuth.ts
@@ -0,0 +1,86 @@
+function toHeadersObject(headers?: HeadersInit): Record<string, string> {
+  if (!headers) {
+    return {}
+  }
+
+  if (headers instanceof Headers) {
+    return Object.fromEntries(headers.entries())
+  }
+
+  if (Array.isArray(headers)) {
+    return Object.fromEntries(headers)
+  }
+
+  return { ...headers }
+}
+
+function getDownloadFileName(contentDisposition: string | null, fallback: string) {
+  if (!contentDisposition) {
+    return fallback
+  }
+
+  const utf8Match = contentDisposition.match(/filename\*=UTF-8''([^;]+)/i)
+  if (utf8Match?.[1]) {
+    return decodeURIComponent(utf8Match[1])
+  }
+
+  const asciiMatch = contentDisposition.match(/filename="([^"]+)"/i)
+  if (asciiMatch?.[1]) {
+    return asciiMatch[1]
+  }
+
+  return fallback
+}
+
+export function useApiAuthHeader() {
+  const runtimeConfig = useRuntimeConfig()
+  const token = runtimeConfig.public.apiSecretKey
+
+  if (!token) {
+    return {}
+  }
+
+  // Tous les appels frontend vers /api/* reutilisent ce header commun.
+  return {
+    Authorization: `Bearer ${token}`
+  }
+}
+
+export async function downloadApiFile(url: string, fileNameFallback: string) {
+  // Les telechargements passent aussi par fetch pour pouvoir envoyer
+  // le header Authorization, contrairement a un simple <a href>.
+  const response = await fetch(url, {
+    headers: useApiAuthHeader()
+  })
+
+  if (!response.ok) {
+    throw new Error(`HTTP ${response.status}`)
+  }
+
+  const blob = await response.blob()
+  const objectUrl = URL.createObjectURL(blob)
+  const fileName = getDownloadFileName(
+    response.headers.get("content-disposition"),
+    fileNameFallback
+  )
+  const link = document.createElement("a")
+
+  link.href = objectUrl
+  link.download = fileName
+  link.style.display = "none"
+  document.body.appendChild(link)
+  link.click()
+  link.remove()
+  URL.revokeObjectURL(objectUrl)
+}
+
+export function withApiAuth(init: RequestInit = {}) {
+  // Fusionne le header d'auth avec d'eventuels headers deja fournis.
+  return {
+    ...init,
+    headers: {
+      ...useApiAuthHeader(),
+      ...toHeadersObject(init.headers)
+    }
+  }
+}
diff --git a/nuxt.config.ts b/nuxt.config.ts
index 0145bef..897c822 100644
--- a/nuxt.config.ts
+++ b/nuxt.config.ts
@@ -26,7 +26,7 @@ export default defineNuxtConfig({
     head: {
       link: [
         { rel: "preconnect", href: "https://fonts.googleapis.com" },
-        { rel: "preconnect", href: "https://fonts.gstatic.com", crossorigin: "" },
+        { rel: "preconnect", href: "https://fonts.gstatic.com ", crossorigin: "" },
         {
           rel: "stylesheet",
           href: "https://fonts.googleapis.com/css2?family=JetBrains+Mono:wght@400;500;600;700&family=Outfit:wght@300;400;500;600;700;800;900&display=swap"
diff --git a/pages/index.vue b/pages/index.vue
index 1f6a1ff..ac25caf 100644
--- a/pages/index.vue
+++ b/pages/index.vue
@@ -158,13 +158,12 @@ const runScript = async () => {
     })
     rawResults.value = output.results
   } catch (error) {
-    const message = `Erreur: ${error instanceof Error ? error.message : String(error)}`
     rawResults.value = [
       {
         key: "error",
         label: "Source indisponible",
         ok: false,
-        output: message
+        output: "Erreur lors de l'opération"
       }
     ]
   } finally {
diff --git a/server/api/backup-script.post.ts b/server/api/backup-script.post.ts
index a9eb7b1..a018c74 100644
--- a/server/api/backup-script.post.ts
+++ b/server/api/backup-script.post.ts
@@ -50,9 +50,11 @@ export default defineEventHandler(async (event) => {
       output: output.trim()
     }
   } catch (error) {
+    console.error("Erreur execution script:", error)
+
     throw createError({
       statusCode: 500,
-      statusMessage: `Erreur execution script: ${String(error)}`
+      statusMessage: "Erreur lors de l'opération"
     })
   }
 })
diff --git a/server/api/backups.get.ts b/server/api/backups.get.ts
index f81ecb9..ee2582c 100644
--- a/server/api/backups.get.ts
+++ b/server/api/backups.get.ts
@@ -31,9 +31,11 @@ function isMissingPathError(error: unknown): boolean {
 }
 
 function toServerError(error: unknown) {
+  console.error("Erreur backups:", error)
+
   return createError({
     statusCode: 500,
-    statusMessage: `Erreur SSH backups: ${String(error)}`
+    statusMessage: "Erreur lors de l'opération"
   })
 }
 
diff --git a/server/api/discord/messages.get.ts b/server/api/discord/messages.get.ts
index c004834..4e67f88 100644
--- a/server/api/discord/messages.get.ts
+++ b/server/api/discord/messages.get.ts
@@ -1,15 +1,31 @@
 export default defineEventHandler(async () => {
-    const token = process.env.DISCORD_BOT_TOKEN
-    const channel = process.env.DISCORD_CHANNEL_ID
+  const token = process.env.DISCORD_BOT_TOKEN
+  const channel = process.env.DISCORD_CHANNEL_ID
 
+  if (!token || !channel) {
+    throw createError({
+      statusCode: 503,
+      statusMessage: "Service indisponible"
+    })
+  }
+
+  try {
     const messages = await $fetch(
-        `https://discord.com/api/v10/channels/${channel}/messages?limit=20`,
-        {
-            headers: {
-                Authorization: `Bot ${token}`
-            }
+      `https://discord.com/api/v10/channels/${channel}/messages?limit=20`,
+      {
+        headers: {
+          Authorization: `Bot ${token}`
         }
+      }
     )
 
     return messages
-})
\ No newline at end of file
+  } catch (error) {
+    console.error("Erreur Discord messages:", error)
+
+    throw createError({
+      statusCode: 500,
+      statusMessage: "Erreur lors de l'opération"
+    })
+  }
+})
diff --git a/server/api/disk.get.ts b/server/api/disk.get.ts
index 0c59016..b469220 100644
--- a/server/api/disk.get.ts
+++ b/server/api/disk.get.ts
@@ -40,11 +40,12 @@ export default defineEventHandler(async () => {
           output
         }
       } catch (error) {
+        console.error(`Erreur disk source ${source.key}:`, error)
         return {
           key: source.key,
           label: source.label,
           ok: false,
-          output: `Erreur: ${String(error)}`
+          output: "Erreur lors de l'opération"
         }
       }
     })
diff --git a/server/api/download.get.ts b/server/api/download.get.ts
index f317d59..7ca0ebd 100644
--- a/server/api/download.get.ts
+++ b/server/api/download.get.ts
@@ -7,7 +7,7 @@ const REMOTE_ROOT = process.env.BACKUPS_REMOTE_ROOT || "/home/malio-b/backups"
 const FOLDER_MAP = folderMap as Record<string, string>
 
 const isSafeFolder = (value: string) => /^[a-zA-Z0-9._-]+$/.test(value)
-const isSafeFile = (value: string) => /^[^/\\]+$/.test(value)
+const isSafeFile = (value: string) => /^[a-zA-Z0-9._-]+$/.test(value)
 const shellQuote = (value: string) => `'${value.replace(/'/g, `'\\''`)}'`
 
 function runSsh(command: string): Promise<string> {