Infinite page reloads when a index.html (built with adapter-static) is opened as explicit url (www.domain.com/index.html)

[sateeshsai]

Describe the bug

Few web servers (like SharePoint) serve few pages with urls that incude the default filename in them, i.e., www.domain.com/index.html instead of www.domain.com.

When hosting index.html file built with adapter-static in such web servers, and opened as www.domain.com/index.html, the page goes into infinite reloads finally throwing the following errors:

• Too many calls to Location or History APIs within a short timeframe.
• Uncaught (in promise) DOMException: The operation is insecure.

Reproduction

• Create a new Sveltekit project
• Set adapter to adapter-static in svelte.config.js
• Build and preview the page
• Add /index.html to the url (e.g., http://localhost:4173/index.html)

Logs

Too many calls to Location or History APIs within a short timeframe. index.html:19:45550
Uncaught (in promise) DOMException: The operation is insecure.
    Ts http://localhost:4173/index.html:19
    ws http://localhost:4173/index.html:19
    Ms http://localhost:4173/index.html:21
    <anonymous> http://localhost:4173/index.html:24
index.html:19
Too many calls to Location or History APIs within a short timeframe. index.html:19:34175
Uncaught (in promise) DOMException: The operation is insecure.
    ws http://localhost:4173/index.html:19
    Ms http://localhost:4173/index.html:21
    <anonymous> http://localhost:4173/index.html:24

System Info

System:
    OS: macOS 15.2
    CPU: (12) arm64 Apple M2 Max
    Memory: 86.55 MB / 32.00 GB
    Shell: 5.9 - /bin/zsh
  Binaries:
    Node: 20.12.2 - /usr/local/bin/node
    npm: 10.5.2 - /usr/local/bin/npm
    pnpm: 9.0.5 - /usr/local/bin/pnpm
  Browsers:
    Chrome: 131.0.6778.205
    Edge: 131.0.2903.112
    Safari: 18.2
  npmPackages:
    @sveltejs/adapter-auto: ^3.0.0 => 3.3.1 
    @sveltejs/adapter-static: ^3.0.8 => 3.0.8 
    @sveltejs/kit: ^2.0.0 => 2.15.1 
    @sveltejs/vite-plugin-svelte: ^4.0.0 => 4.0.4 
    svelte: ^5.0.0 => 5.16.5 
    vite: ^5.4.11 => 5.4.11

Severity

blocking all usage of SvelteKit

Additional Information

Unable to use SvelteKit for internal apps because of this issue.

[eltigerchino]

I can't reproduce the issue given the reproduction steps. Please provide a minimal reproduction.

[sateeshsai]

Repo here:
https://github.com/sateeshsai/sveltekit-issue-reproduction

build, preview, and access the page with index.html in the url - i.e., http://localhost:4173/index.html and NOT just http://localhost:4173

[eltigerchino]

The infinite refresh seems to happen when building using the hash router, running vite preview, and accessing http://localhost:4173/index.html

import adapter from "@sveltejs/adapter-static";
import { vitePreprocess } from "@sveltejs/vite-plugin-svelte";

/** @type {import('@sveltejs/kit').Config} */
const config = {
  preprocess: vitePreprocess(),
  kit: {
    adapter: adapter(),
    router: { type: "hash" }
  },
};

export default config;

cc: @dummdidumm