diff --git a/frontend/package.json b/frontend/package.json
index 17f489e..98b066d 100644
--- a/frontend/package.json
+++ b/frontend/package.json
@@ -14,6 +14,7 @@
     "@fontsource/roboto": "^5.0.6",
     "@mui/icons-material": "^5.11.16",
     "@mui/material": "^5.13.5",
+    "fp-ts": "^2.16.1",
     "react": "^18.2.0",
     "react-dom": "^18.2.0",
     "react-helmet": "^6.1.0",
diff --git a/frontend/src/lib/httpClient.ts b/frontend/src/lib/httpClient.ts
index cd981ad..7fdeb01 100644
--- a/frontend/src/lib/httpClient.ts
+++ b/frontend/src/lib/httpClient.ts
@@ -1,13 +1,24 @@
-export async function ffetch<T>(
-  url: string,
-  onSuccess: (res: T) => void,
-  onError: (err: string) => void,
-  opt?: RequestInit,
-) {
+import { tryCatch } from 'fp-ts/TaskEither'
+import { flow } from 'fp-ts/lib/function'
+
+export const ffetch = <T>(url: string, opt?: RequestInit) => flow(
+  tryCatch(
+    () => fetcher<T>(url, opt),
+    (e) => `error while fetching: ${e}`
+  )
+)
+
+const fetcher = async <T>(url: string, opt?: RequestInit) => {
   const res = await fetch(url, opt)
-  if (!res.ok) {
-    onError(await res.text())
-    return
+
+  if (opt && !opt.headers) {
+    opt.headers = {
+      'Content-Type': 'application/json',
+    }
   }
-  onSuccess(await res.json() as T)
+
+  if (!res.ok) {
+    throw await res.text()
+  }
+  return res.json() as T
 }
\ No newline at end of file
diff --git a/frontend/src/utils.ts b/frontend/src/utils.ts
index 00e979c..acfc6ac 100644
--- a/frontend/src/utils.ts
+++ b/frontend/src/utils.ts
@@ -1,3 +1,4 @@
+import { pipe } from 'fp-ts/lib/function'
 import type { RPCResponse } from "./types"
 
 /**
@@ -10,15 +11,6 @@ export function validateIP(ipAddr: string): boolean {
   return ipRegex.test(ipAddr)
 }
 
-/**
- * Validate a domain via regex.  
- * The validation pass if the domain respects the following formats:  
- * - localhost
- * - domain.tld
- * - dir.domain.tld
- * @param domainName 
- * @returns domain validity test
- */
 export function validateDomain(url: string): boolean {
   const urlRegex = /(www\.)?[-a-zA-Z0-9@:%._\+~#=]{1,256}\.[a-zA-Z0-9()]{1,6}\b([-a-zA-Z0-9()!@:%_\+.~#?&\/\/=]*)/
   const slugRegex = /^[a-z0-9]+(?:-[a-z0-9]+)*$/
@@ -28,17 +20,6 @@ export function validateDomain(url: string): boolean {
   return urlRegex.test(url) || name === 'localhost' && slugRegex.test(slug)
 }
 
-/**
- * Validate a domain via regex.  
- * Exapmples
- * - http://example.com
- * - https://example.com
- * - http://www.example.com
- * - https://www.example.com
- * - http://10.0.0.1/[something]/[something-else]
- * @param url 
- * @returns url validity test
- */
 export function isValidURL(url: string): boolean {
   let urlRegex = /https?:\/\/(www\.)?[-a-zA-Z0-9@:%._\+~#=]{1,256}\.[a-zA-Z0-9()]{1,6}\b([-a-zA-Z0-9()!@:%_\+.~#?&\/\/=]*)/
   return urlRegex.test(url)
@@ -93,4 +74,11 @@ export function mapProcessStatus(status: number) {
 }
 
 export const prefersDarkMode = () =>
-  window.matchMedia('(prefers-color-scheme: dark)').matches
\ No newline at end of file
+  window.matchMedia('(prefers-color-scheme: dark)').matches
+
+export const base64URLEncode = (s: string) => pipe(
+  s,
+  s => String.fromCodePoint(...new TextEncoder().encode(s)),
+  btoa,
+  encodeURIComponent
+)
\ No newline at end of file
diff --git a/frontend/src/views/Archive.tsx b/frontend/src/views/Archive.tsx
index 097a478..49acc16 100644
--- a/frontend/src/views/Archive.tsx
+++ b/frontend/src/views/Archive.tsx
@@ -26,22 +26,26 @@ import FolderIcon from '@mui/icons-material/Folder'
 import InsertDriveFileIcon from '@mui/icons-material/InsertDriveFile'
 import VideoFileIcon from '@mui/icons-material/VideoFile'
 
+import { matchW } from 'fp-ts/lib/TaskEither'
+import { pipe } from 'fp-ts/lib/function'
 import { useEffect, useMemo, useState, useTransition } from 'react'
 import { useNavigate } from 'react-router-dom'
 import { useRecoilValue } from 'recoil'
 import { BehaviorSubject, Subject, combineLatestWith, map, share } from 'rxjs'
 import { serverURL } from '../atoms/settings'
 import { useObservable } from '../hooks/observable'
+import { useToast } from '../hooks/toast'
 import { useI18n } from '../hooks/useI18n'
 import { ffetch } from '../lib/httpClient'
 import { DeleteRequest, DirectoryEntry } from '../types'
-import { roundMiB } from '../utils'
+import { base64URLEncode, roundMiB } from '../utils'
 
 export default function Downloaded() {
   const serverAddr = useRecoilValue(serverURL)
   const navigate = useNavigate()
 
   const { i18n } = useI18n()
+  const { pushMessage } = useToast()
 
   const [openDialog, setOpenDialog] = useState(false)
 
@@ -50,20 +54,24 @@ export default function Downloaded() {
 
   const [isPending, startTransition] = useTransition()
 
-  const fetcher = () => ffetch<DirectoryEntry[]>(
-    `${serverAddr}/archive/downloaded`,
-    (d) => files$.next(d),
-    () => navigate('/login'),
-    {
-      method: 'POST',
-      headers: {
-        'Content-Type': 'application/json',
+  const fetcher = () => pipe(
+    ffetch<DirectoryEntry[]>(
+      `${serverAddr}/archive/downloaded`,
+      {
+        method: 'POST',
+        body: JSON.stringify({
+          subdir: '',
+        })
+      }
+    ),
+    matchW(
+      (e) => {
+        pushMessage(e)
+        navigate('/login')
       },
-      body: JSON.stringify({
-        subdir: '',
-      })
-    }
-  )
+      (d) => files$.next(d),
+    )
+  )()
 
   const fetcherSubfolder = (sub: string) => {
     const folders = sub.startsWith('/')
@@ -137,9 +145,7 @@ export default function Downloaded() {
   }, [serverAddr])
 
   const onFileClick = (path: string) => startTransition(() => {
-    const encoded = btoa(
-      String.fromCodePoint(...new TextEncoder().encode(path))
-    )
+    const encoded = base64URLEncode(path)
 
     window.open(`${serverAddr}/archive/d/${encoded}`)
   })
diff --git a/go.mod b/go.mod
index f0ec5ab..a97fabb 100644
--- a/go.mod
+++ b/go.mod
@@ -4,11 +4,12 @@ go 1.20
 
 require (
 	github.com/go-chi/chi/v5 v5.0.10
+	github.com/go-chi/cors v1.2.1
 	github.com/goccy/go-json v0.10.2
 	github.com/golang-jwt/jwt/v5 v5.0.0
 	github.com/google/uuid v1.3.1
 	github.com/gorilla/websocket v1.5.0
 	github.com/marcopeocchi/fazzoletti v0.0.0-20230308161120-c545580f79fa
-	golang.org/x/sys v0.12.0
+	golang.org/x/sys v0.13.0
 	gopkg.in/yaml.v3 v3.0.1
 )
diff --git a/go.sum b/go.sum
index 20cd1f1..602fbc6 100644
--- a/go.sum
+++ b/go.sum
@@ -1,21 +1,21 @@
 github.com/go-chi/chi/v5 v5.0.10 h1:rLz5avzKpjqxrYwXNfmjkrYYXOyLJd37pz53UFHC6vk=
 github.com/go-chi/chi/v5 v5.0.10/go.mod h1:DslCQbL2OYiznFReuXYUmQ2hGd1aDpCnlMNITLSKoi8=
+github.com/go-chi/cors v1.2.1 h1:xEC8UT3Rlp2QuWNEr4Fs/c2EAGVKBwy/1vHx3bppil4=
+github.com/go-chi/cors v1.2.1/go.mod h1:sSbTewc+6wYHBBCW7ytsFSn836hqM7JxpglAy2Vzc58=
 github.com/goccy/go-json v0.10.2 h1:CrxCmQqYDkv1z7lO7Wbh2HN93uovUHgrECaO5ZrCXAU=
 github.com/goccy/go-json v0.10.2/go.mod h1:6MelG93GURQebXPDq3khkgXZkazVtN9CRI+MGFi0w8I=
 github.com/golang-jwt/jwt/v5 v5.0.0 h1:1n1XNM9hk7O9mnQoNBGolZvzebBQ7p93ULHRc28XJUE=
 github.com/golang-jwt/jwt/v5 v5.0.0/go.mod h1:pqrtFR0X4osieyHYxtmOUWsAWrfe1Q5UVIyoH402zdk=
-github.com/google/uuid v1.3.0 h1:t6JiXgmwXMjEs8VusXIJk2BXHsn+wx8BZdTaoZ5fu7I=
-github.com/google/uuid v1.3.0/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=
 github.com/google/uuid v1.3.1 h1:KjJaJ9iWZ3jOFZIf1Lqf4laDRCasjl0BCmnEGxkdLb4=
 github.com/google/uuid v1.3.1/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=
 github.com/gorilla/websocket v1.5.0 h1:PPwGk2jz7EePpoHN/+ClbZu8SPxiqlu12wZP/3sWmnc=
 github.com/gorilla/websocket v1.5.0/go.mod h1:YR8l580nyteQvAITg2hZ9XVh4b55+EU/adAjf1fMHhE=
 github.com/marcopeocchi/fazzoletti v0.0.0-20230308161120-c545580f79fa h1:uaAQLGhN4SesB9inOQ1Q6EH+BwTWHQOvwhR0TIJvnYc=
 github.com/marcopeocchi/fazzoletti v0.0.0-20230308161120-c545580f79fa/go.mod h1:RvfVo/6Sbnfra9kkvIxDW8NYOOaYsHjF0DdtMCs9cdo=
-golang.org/x/sys v0.9.0 h1:KS/R3tvhPqvJvwcKfnBHJwwthS11LRhmM5D59eEXa0s=
-golang.org/x/sys v0.9.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.12.0 h1:CM0HF96J0hcLAwsHPJZjfdNzs0gftsLfgKt57wWHJ0o=
 golang.org/x/sys v0.12.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/sys v0.13.0 h1:Af8nKPmuFypiUBjVoU9V20FiaFXOcuZI21p0ycVYYGE=
+golang.org/x/sys v0.13.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405 h1:yhCVgyC4o1eVCa2tZl7eS0r+SDo693bJlVdllGtEeKM=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
diff --git a/server/handlers/archive.go b/server/handlers/archive.go
index 820a13a..1b8f34a 100644
--- a/server/handlers/archive.go
+++ b/server/handlers/archive.go
@@ -4,6 +4,7 @@ import (
 	"encoding/base64"
 	"fmt"
 	"net/http"
+	"net/url"
 	"os"
 	"path/filepath"
 	"sort"
@@ -130,6 +131,12 @@ func SendFile(w http.ResponseWriter, r *http.Request) {
 		return
 	}
 
+	path, err := url.QueryUnescape(path)
+	if err != nil {
+		http.Error(w, err.Error(), http.StatusBadRequest)
+		return
+	}
+
 	decoded, err := base64.StdEncoding.DecodeString(path)
 	if err != nil {
 		http.Error(w, err.Error(), http.StatusBadRequest)
@@ -137,7 +144,7 @@ func SendFile(w http.ResponseWriter, r *http.Request) {
 	}
 
 	decodedStr := string(decoded)
-	fmt.Println(decodedStr)
+	fmt.Println("decoded", decodedStr)
 
 	root := config.Instance().GetConfig().DownloadPath
 
diff --git a/server/server.go b/server/server.go
index 371505b..16e8f29 100644
--- a/server/server.go
+++ b/server/server.go
@@ -14,6 +14,7 @@ import (
 
 	"github.com/go-chi/chi/v5"
 	"github.com/go-chi/chi/v5/middleware"
+	"github.com/go-chi/cors"
 	"github.com/marcopeocchi/yt-dlp-web-ui/server/handlers"
 	"github.com/marcopeocchi/yt-dlp-web-ui/server/internal"
 	middlewares "github.com/marcopeocchi/yt-dlp-web-ui/server/middleware"
@@ -54,7 +55,7 @@ func newServer(c serverConfig) *http.Server {
 
 	r := chi.NewRouter()
 
-	r.Use(middlewares.CORS)
+	r.Use(cors.AllowAll().Handler)
 	r.Use(middleware.Logger)
 
 	app := http.FileServer(http.FS(c.frontend))