cloudflare-error-page

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cloudflare-error-page

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✅Browser ❌Cloudflare ✅Host — Customized Cloudflare error page generator. (unofficial)

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- - docker.yml
- - .gitignore
  - template.html
- __init__.py
- - config.example.toml
  - hatch_build.py
  - pyproject.toml
- - .prettierrc
  - index.html
  - package.json
  - tsconfig.json
  - vite.config.ts
  - yarn.lock
- editor.dockerfile
- catastrophic.json
- default.json
- example.py
- flask_demo.py
- working.json
- - example.js
  - test-compatibility.js
- - copy-files.js
- - assets.d.ts
  - index.ts
- .gitignore
- .npmignore
- LICENSE
- package-lock.json
- package.json
- README.md
- rollup.config.ts
- tsconfig.json
- - cf-icon-browser.svg
  - cf-icon-cloud.svg
  - cf-icon-error.svg
  - cf-icon-ok.svg
  - cf-icon-server.svg
- - main-original.css
  - main.css
- hatch_build.py
- inline_resources.py
.dockerignore
.gitignore
LICENSE.txt
pyproject.toml
README.md

// repository documentation

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# Cloudflare Error Page Generator

## What does this project do?

This project creates customized error pages that mimic the well-known Cloudflare error page. You can also embed it into your own website.

## Online Editor

Here's an online editor to create customized error pages and example server apps. Try it out [here](https://magicalforest.io/cferr/editor/).

![Editor](https://github.com/donlon/cloudflare-error-page/blob/images/editor.png?raw=true)

## Quickstart for Programmers

### JavaScript/NodeJS

Install the `cloudflare-error-page` package using npm:

``` Bash
npm install cloudflare-error-page
```

The following example demonstrates an Express application that automatically handles server errors.

``` JavaScript
import express from 'express';
import { render as render_cf_error_page } from 'cloudflare-error-page';

const app = express();

app.get('/', (req, res) => {
  /* Some code that break prod. Pushed by a new employee recently. */
  let [feature_values, _] = features
    .append_with_names(self.config.feature_names)
    .unwrap();
}

app.use((err, req, res) => {
  /* Handle the error intelligently by using a custom handler */
  res.status(500).send(render_cf_error_page({
    "title": "Internal server error",
    "error_code": "500",
    "what_happened": err.toString(),
    "what_can_i_do": "Please try again in a few minutes.",
  }));
});

app.listen(3000);
```

(Thanks [@junduck](https://github.com/junduck) for creating the original NodeJS version.)

### Python

Install `cloudflare-error-page` using pip.

``` Bash
pip install cloudflare-error-page
```

Then an error page can be generated using the `render` function provided by the package. ([example.py](examples/example.py))

``` Python
import webbrowser
from cloudflare_error_page import render as render_cf_error_page

# This function renders an error page based on the input parameters
error_page = render_cf_error_page({
    # Browser status is ok
    'browser_status': {
        "status": 'ok',
    },
    # Cloudflare status is error
    'cloudflare_status': {
        "status": 'error',
        "status_text": 'Error',
    },
    # Host status is also ok
    'host_status': {
        "status": 'ok',
        "location": 'example.com',
    },
    # Position of the error indicator, valid options are 'browser', 'cloudflare', and 'host'
    'error_source': 'cloudflare',

# Texts shown in the bottom of the page
 'what_happened': 'There is an internal server error on Cloudflare\'s network.',
 'what_can_i_do': 'Please try again in a few minutes.',
})

# Write generated webpage to file
with open('error.html', 'w') as f:
    f.write(error_page)

# Open the generated page in browser
webbrowser.open('error.html')
```

A demo server using Flask is available in [flask_demo.py](examples/flask_demo.py), and you can also see live demo [here](https://magicalforest.io/cferr/examples/default).

## More Examples

### Catastrophic infrastructure failure

``` Python
params = {
 "title": "Catastrophic infrastructure failure",
 "more_information": {
 "for": "no information",
 },
 "browser_status": {
 "status": "error",
 "status_text": "Out of Memory",
 },
 "cloudflare_status": {
 "status": "error",
 "location": "Everywhere",
 "status_text": "Error",
 },
 "host_status": {
 "status": "error",
 "location": "example.com",
 "status_text": "On Fire",
 },
 "error_source": "cloudflare",
 "what_happened": "There is a catastrophic failure.",
 "what_can_i_do": "Please try again in a few years.",
}
```

![Catastrophic infrastructure failure](https://github.com/donlon/cloudflare-error-page/blob/images/example.png?raw=true)

[Demo](https://magicalforest.io/cferr/examples/catastrophic)

### Web server is working

``` Python
params = {
 "title": "Web server is working",
 "error_code": "200",
 "more_information": {
 "hidden": True,
 },
 "browser_status": {
 "status": "ok",
 "status_text": "Seems Working",
 },
 "cloudflare_status": {
 "status": "ok",
 "status_text": "Often Working",
 },
 "host_status": {
 "status": "ok",
 "location": "example.com",
 "status_text": "Almost Working",
 },
 "error_source": "host",
 "what_happened": "This site is still working. And it looks great.",
 "what_can_i_do": "Visit the site before it crashes someday.",
}
```

![Web server is working](https://github.com/donlon/cloudflare-error-page/blob/images/example2.png?raw=true)

[Demo](https://magicalforest.io/cferr/examples/working)

## FAQ

### 💡 How to show real user IP / Cloudflare Ray ID / data center location in the error page so that it looks more realistic?

Ray ID and user IP field in the error page can be set by `ray_id` and `client_ip` properties in the `params` argument passed to the render function. The real Cloudflare Ray ID and the data center location of current request can be extracted from the `Cf-Ray` request header (e.g. `Cf-Ray: 230b030023ae2822-SJC`). Detailed description of this header can be found at [Cloudflare documentation](https://developers.cloudflare.com/fundamentals/reference/http-headers/#cf-ray).

To lookup the city name of the data center corresponding to the three letter code in the header, you can use a location list [here](https://github.com/Netrvin/cloudflare-colo-list/blob/main/DC-Colos.json)

The demo server runs in our website did handle these. Take a look at [this file](https://github.com/donlon/cloudflare-error-page/blob/e2226ff5bb7a877c9fe3ac09deadccdc58b0c1c7/editor/server/utils.py#L78) for reference.

### 🤔 Is putting this on my website totally legal? As it contains trademarked logo/name and it's pretending to be an official one.

Use it at you own risk. There're still chances Cloudflare send you takedown request or take legal actions. But it depends on if you use it properly. It's better to change texts on the page so users know it's a joke.

If you do want to use an error page that pretends to be a Cloudflare one on your production environment, don't forget to fix your server quickly when it goes down so that they won't find that you are faking their error page. (See [#4](https://github.com/donlon/cloudflare-error-page/issues/4#issuecomment-4445691769))

## See also

- [cloudflare-error-page-3th.pages.dev](https://cloudflare-error-page-3th.pages.dev/)

Error page of every HTTP status code (reload to show random pages).

- [oftx/cloudflare-error-page](https://github.com/oftx/cloudflare-error-page)

React reimplementation of the original page, and can be deployed directly to Cloudflare Pages.

## Full Parameter Reference
``` JavaScript
{
    "html_title": "cloudflare.com | 500: Internal server error",
    "title": "Internal server error",
    "error_code": "500",
    "time": "2025-11-18 12:34:56 UTC",  // Current UTC time will be shown if empty

// Configuration of "Visit ... for more information"
    "more_information": {
        "hidden": false,
        "text": "cloudflare.com", 
        "link": "https://www.cloudflare.com/",
        "for": "more information",
    },

// Configuration of the Browser/Cloudflare/Host status block
    "browser_status": {
        "status": "ok", // "ok" or "error"
        "location": "You",
        "name": "Browser",
        "status_text": "Working",
        "status_text_color": "#9bca3e",
    },
    "cloudflare_status": {
        "status": "error",
        "location": "Cloud",
        "name": "Cloudflare",
        "status_text": "Error",
        "status_text_color": "#bd2426",
    },
    "host_status": {
        "status": "ok",
        "location": "Website",
        "name": "Host",
        "status_text": "Working",
        "status_text_color": "#9bca3e",
    },
    // Position of the error indicator, valid options are 'browser', 'cloudflare', and 'host'
    "error_source": "host",

"what_happened": "There is an internal server error on Cloudflare's network.",
 "what_can_i_do": "Please try again in a few minutes.",

"ray_id": '0123456789abcdef',  // Random hex string will be shown if empty
    "client_ip": '1.1.1.1',

// Configuration of 'Performance & security by ...' in the footer
    "perf_sec_by": {
        "text": "Cloudflare",
        "link": "https://www.cloudflare.com/",
    },
}
```

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