diff --git a/frontend.js b/frontend.js
index cb4d347..e11dc0e 100644
--- a/frontend.js
+++ b/frontend.js
@@ -1,4 +1,16 @@
 export class Frontend {
+  contentTypes = {
+    html: 'text/html; charset=utf-8',
+    js: 'text/javascript',
+    css: 'text/css',
+    md: 'text/plain',
+    txt: 'text/plain',
+    png: 'image/png',
+    jpg: 'image/jpg',
+    webm: 'image/webm',
+    svg: 'image/svg',
+  }
+
   constructor({apiBaseUrl, appBaseUrl}) {
     this.apiBaseUrl = apiBaseUrl
     this.appBaseUrl = appBaseUrl
@@ -9,34 +21,51 @@ export class Frontend {
   repoUrl(user, repo) {
     return (
       this.apiBaseUrl +
+      '/repos' +
       '/' + encodeURIComponent(user) +
       '/' + encodeURIComponent(repo)
     )
   }
 
+  pathString(path) {
+    return path.map(s => (
+      '/' + encodeURIComponent(s)
+    )).join('')
+  }
+
   rawUrl(user, repo, commit, path) {
     return (
       this.appBaseUrl +
+      '/' + encodeURIComponent(user) +
+      '/' + encodeURIComponent(repo) +
       '/raw/commit' +
       '/' + encodeURIComponent(commit) +
-      '/' + encodeURI(path)
+      this.pathString(path)
     )
   }
 
+  checkOk(resp) {
+    if (!resp.ok) {
+      throw new Error('not ok - ' + JSON.stringify(
+        {status: resp.status, url: resp.url}
+      ))
+    }
+  }
+
   async loadFile(user, repo, commit, src, dest) {
-    const url = this.rawUrl(user, repo)
+    const url = this.rawUrl(user, repo, commit, dest)
     const resp = await fetch(url)
+    this.checkOk(resp)
     const body = await resp.arrayBuffer()
-    this.files[dest] = {
+    const ext = dest.at('-1')?.match?.(/\.(\w+)$/)?.[1]
+    const contentType = this.contentTypes[ext]
+    console.log({ext, contentType})
+    this.files[this.pathString(dest)] = {
       user,
       repo,
       commit,
       body,
-      contentType: (
-        dest.endsWith('.js') ?
-        'text/javascript' :
-        resp.headers.get('content-type')
-      )
+      contentType: contentType ?? 'application/octet-stream',
     }
   }
 
@@ -44,9 +73,7 @@ export class Frontend {
     const url = new URL(
       this.repoUrl(user, repo) +
       '/contents' +
-      path.map(s => (
-        '/' + encodeURIComponent(s)
-      )).join('')
+      this.pathString(path)
     )
     if (ref !== undefined) {
       const search = new URLSearchParams()
@@ -64,6 +91,7 @@ export class Frontend {
       user, repo, srcPath, ref
     )
     const resp = await fetch(url)
+    this.checkOk(resp)
     const contents = await resp.json()
     for (const item of contents) {
       if (item.type === 'dir') {
@@ -76,7 +104,7 @@ export class Frontend {
         this.tasks.push(this.loadFile(
           user,
           repo,
-          last_commit_sha,
+          item.last_commit_sha,
           [...srcPath, item.name],
           [...destPath, item.name],
         ))
@@ -85,7 +113,7 @@ export class Frontend {
     let prevCount = 0
     while (this.tasks.count > prevCount) {
       prevCount = this.tasks.count
-      await Promise.allSettled(this.tasks)
+      await Promise.all(this.tasks)
     }
   }
 
@@ -94,7 +122,7 @@ export class Frontend {
     if (pathname in this.files) {
       const file = this.files[pathname]
       event.respondWith(new Response(file.body, {
-        status: 404,
+        status: 200,
         headers: {
           'Content-Type': file.contentType,
         },
diff --git a/server.js b/server.js
index 5fba0c7..1bd9962 100644
--- a/server.js
+++ b/server.js
@@ -70,4 +70,10 @@ export class Server {
       this.serveConn(conn)
     }
   }
+
+  async run() {
+    await this.configure()
+    await this.init()
+    await this.serve()
+  }
 }
\ No newline at end of file