521 Web Server Is Down

Cloudflare specific error. The origin server refused connections from Cloudflare.

When and Why to Use It

Cloudflare specific error. The origin server refused connections from Cloudflare.

Usage Examples

Shokupan (Functional)

import { HttpException, get } from 'shokupan';

export const getResource = get('/resource', () => {
    throw new HttpException('Web Server Is Down', 521);
});

Shokupan (Controller)

import { Controller, Get, HttpException } from 'shokupan';

@Controller('/api')
export class ExampleController {
    @Get('/resource')
    getResource() {
        throw new HttpException('Web Server Is Down', 521);
    }
}

Express

import express from 'express';
const app = express();

app.get('/resource', (req, res) => {
    res.status(521).json({ error: 'Web Server Is Down' });
});

Nest

import { Controller, Get, HttpException } from '@nestjs/common';

@Controller('api')
export class ExampleController {
  @Get('resource')
  getResource() {
    throw new HttpException('Web Server Is Down', 521);
  }
}

Koa

import Koa from 'koa';
const app = new Koa();

app.use(async ctx => {
  if (ctx.path === '/resource' && ctx.method === 'GET') {
    ctx.status = 521;
    ctx.body = { error: 'Web Server Is Down' };
  }
});