Why Do Big Websites Go Down When Cloudflare Is Down?

Introduction

In recent years, whenever Cloudflare faces an outage, thousands of websites across the world stop working. Popular e-commerce portals, SaaS products, fintech applications, trading platforms, streaming services, and even government websites become unreachable for several minutes or even hours.

Many people often ask:

“Why does a problem in Cloudflare affect unrelated websites?”
“Why does half the internet go down because a single company is facing issues?”

This article explains the complete technical story in a simple but accurate way, aimed especially at senior developers, architects, and DevOps engineers.

We will cover:

How Cloudflare works
Why big companies depend on Cloudflare
What happens internally when Cloudflare faces an outage
Real reasons why websites stop working
End-to-end workflow of a request passing through Cloudflare
Flowchart of the failure scenario
How to design systems to reduce impact
Angular-specific best practices to handle downtime
Enterprise-level mitigation strategies

This article does not use jargon unnecessarily. It focuses on practical architecture and real-world lessons.

1. What Is Cloudflare and Why Is It So Critical?

Cloudflare is not just a CDN. It is a full internet edge network and security platform.
Most large websites depend on Cloudflare for at least one of the following:

DNS (Domain Name System) management
CDN (Content Delivery Network)
DDoS protection
WAF (Web Application Firewall)
Bot management
Zero Trust Access
Load balancing
Edge caching
Rate limiting
Reverse proxy routing

This means Cloudflare sits between your server and your users.
It becomes the single gateway for all traffic.

2. Why Big Companies Use Cloudflare

Big organisations depend on Cloudflare because:

It absorbs huge traffic volumes.
It protects against DDoS at a scale they cannot handle internally.
It delivers content faster from global edge locations.
It provides stable DNS with very fast propagation.
It reduces load on backend servers.
It offers easy security hardening.

For an enterprise, setting up their own global edge network is impractical.
Cloudflare provides that at a subscription cost.

As a result, most websites route 100 percent of their traffic through Cloudflare.

3. The Internet Routing Model with Cloudflare

Here is the high-level workflow of a request:

Workflow Diagram: Request Flow Through Cloudflare

                   +----------------------+
                   |     User Browser     |
                   +----------+-----------+
                              |
                              | DNS Lookup
                              v
                   +----------------------+
                   | Cloudflare DNS       |
                   +----------+-----------+
                              |
                              | Route Decision
                              v
                   +----------------------+
                   | Cloudflare Edge Node |
                   | (CDN + WAF + Proxy)  |
                   +----------+-----------+
                              |
                              | Forward to Origin Server
                              v
                   +----------------------+
                   |   Customer Backend   |
                   +----------------------+
                              |
                              | Response
                              v
                   +----------------------+
                   |   Cloudflare Edge    |
                   +----------------------+
                              |
                              | Cached / Processed Response
                              v
                   +----------------------+
                   |    User Browser      |
                   +----------------------+

4. When Cloudflare Goes Down, What Actually Breaks?

Depending on the component that fails, different parts of the internet are affected.

Cloudflare outages typically impact these layers:

4.1 DNS Outage

If Cloudflare DNS goes down:

Users cannot resolve domain names.
Browsers cannot find IP addresses of websites.
Apps cannot discover API endpoints.
Even internal microservices become unreachable.

This is the most severe impact.
DNS is the first point of contact on the internet.
If DNS fails, even healthy servers appear “down.”

4.2 CDN / Edge Network Outage

If Cloudflare’s CDN nodes malfunction:

Static resources like images, JS, CSS fail to load
Websites load partially or break completely
Angular/React apps fail during bootstrap
Requests timeout due to broken proxy routing

4.3 Routing or Proxy Outage

If Cloudflare cannot route traffic:

Requests never reach your backend
Users see 522, 523, 524, or generic “Cloudflare is down” errors
Even API calls fail as Cloudflare blocks the path
Load-balancing logic stops functioning

4.4 Firewall or Security Layer Outage

If WAF rules malfunction:

Genuine traffic gets blocked
Some countries or IP ranges become unreachable
Login pages, payment gateways face unexpected failures

4.5 SSL/TLS Termination Outage

If edge SSL systems fail:

HTTPS handshake breaks
Browsers reject the certificate
Websites load with severe security warnings

5. Why Websites Become Unreachable Even If Their Servers Are Working

The key point:
Traffic must pass through Cloudflare to reach your server.

If Cloudflare is not forwarding traffic due to an outage, your server becomes invisible.

Even if your backend is running perfectly, no user can access it.

It is similar to a toll gate on a highway:

Even if the road behind the toll gate is perfect
If the toll gate is shut
Cars cannot enter
So drivers assume the highway is closed

This is exactly what happens during a Cloudflare outage.

6. Flowchart: What Happens During a Cloudflare Failure

          +---------------------------+
          | User tries to access site |
          +-------------+-------------+
                        |
                        v
          +---------------------------+
          | DNS Lookup via Cloudflare |
          +-------------+-------------+
              Yes DNS?  |    No DNS?
                        v
           DNS Works?         DNS Fails
                |                  |
                |                  v
                v          Website unreachable
 +---------------------------+
 | Connect to Cloudflare Edge|
 +-------------+-------------+
      Edge OK? |     No
               v
         Route traffic to origin
               |
               v
    +---------------------------+
    | Website loads normally    |
    +---------------------------+

If any step in Cloudflare’s chain fails, the entire path collapses.

7. Case Study: Why Big Websites Went Down in Past Cloudflare Outages

Cloudflare has faced several major outages in the past due to:

BGP routing issues
Faulty firewall rule deployment
Data center upgrade failure
Memory leak in key components
Load balancer misconfiguration
DNS propagation bugs
Software rollout that caused CPU exhaustion

Whenever these occurred:

GitHub
Shopify
Medium
Discord
DigitalOcean
Many banking websites
Many major news portals

all became partially or fully unavailable.

This shows how deeply the global internet depends on Cloudflare.

8. Angular Applications: Why Cloudflare Outages Break the UI

Angular applications depend heavily on static assets:

main.js
polyfills.js
runtime.js
styles.css
vendor.js

All these are usually cached and served by Cloudflare’s CDN.

During an outage:

If even one JS file fails to load, the entire Angular app fails to bootstrap
Angular routing breaks
HTTP requests fail
Lazy-loaded modules do not load
API calls return network errors

How it appears to users:

Blank white screen
“App failed to load”
“Failed to fetch” in console
CORS errors (because Cloudflare cannot handle headers)

This is why Angular SPAs look more broken than normal server-rendered websites during outages.

9. How to Protect Angular Apps During Cloudflare Outages

Senior developers can use multiple strategies to minimise downtime.

9.1 Serve Critical JS Locally Without CDN Dependency

Configure Angular build output to allow serving critical assets from your own origin.

Example (nginx config):

location /static/ {
    alias /var/www/html/app/;
}

9.2 Add a Fallback DNS Provider

Use multi-DNS providers:

Cloudflare
AWS Route53
Google Cloud DNS

This prevents complete DNS blackouts.

9.3 Use Service Workers for Offline Cache

A strong Angular PWA can continue working if assets are cached.

9.4 Add Client-Side Fallback API URLs

When a Cloudflare proxy fails, API calls break.
Add fallback URLs inside Angular environments.

9.5 Build Cloudflare-Bypass URLs

Keep a hidden backup domain that does not go through Cloudflare.

Example

Primary: api.myapp.com (Cloudflare)
Backup: backup.myapp.net (direct origin)

Switch automatically from Angular when outage is detected.

10. Enterprise-Level Mitigation Strategies

10.1 Active-Active Multi-CDN Architecture

Use two separate CDNs:

Cloudflare
Akamai
Fastly

Route traffic using a smart load balancer (e.g., NS1).

10.2 Secondary DNS with Automatic Failover

If Cloudflare DNS fails, another DNS provider takes over.

10.3 Bypass Mode

Keep an emergency route that bypasses Cloudflare entirely.
Activated during outages.

10.4 Chaos Testing

Simulate CDN downtime to test system reliability.

10.5 Internal Status Page

Let your Angular app consume a status API and show a clear message:
“Traffic disruption detected. Please retry after a few minutes.”

This reduces customer frustration.

11. Why Dependency on a Single Edge Network Is Risky

Even the biggest companies like:

Meta
Amazon
Google
Microsoft

use multi-layer fallback systems.
Relying on a single provider for DNS + CDN + Proxy + Security is a single point of failure.

Cloudflare is extremely reliable, but no system is 100 percent perfect.

Outages are inevitable.

The real question for architects is:
“Will your application survive that outage?”

12. Conclusion

Big websites go down when Cloudflare faces an outage because Cloudflare is not just a CDN.
It is the entire entry point of the internet for those websites.
DNS, proxy, routing, SSL, WAF and CDN layers depend on Cloudflare’s global edge network.
When a part of this chain breaks, websites become invisible even if their own servers are running perfectly.

For Angular apps, downtime becomes even more visible because static assets fail to load and the SPA architecture cannot bootstrap.

Modern architecture requires:

Redundancy
Multi-DNS
Multi-CDN
Fallback routing
Intelligent Angular-side error handling

Enterprises need to prepare for these scenarios just as they prepare for server failures, database failures or network failures.

Cloudflare outages teach us one solid lesson:

The internet is powerful, but also deeply interconnected. A single global edge provider going down can shake half the digital world.