Introduction
Azure Front Door acts as an entry layer for applications that receive requests from users across different geographical locations. It examines incoming requests and connects them with an appropriate application server based on the availability and performance of the configured backend resources.
This service is particularly useful for applications that operate across multiple regions. If one backend is unavailable, requests can be directed toward another functioning backend, allowing the application to continue serving users with minimal disruption.
Azure Front Door Workflow
1. Users → Send Request
Users worldwide visit your website or app using its URL. Their requests first go
to Azure Front Door.
2. Azure Front Door → Global Gateway
Azure Front Door acts as the main gateway. It decides where to send the request
based on its configuration, which servers are working, and how quickly they respond.
3. Web Application Firewall → Security
The request might go through a Web Application Firewall (WAF). This helps keep
your app safe from common attacks and unwanted traffic.
4. Caching and Acceleration → Improve Response Speed
If the content can be cached, Front Door can serve it from a location closer to
the user. This makes the content load faster and improves response time.
5. Health Probes → Check Backend
Front Door regularly checks if the servers behind it are working properly.
If a server is not working, Front Door stops sending new requests to it.
6. Backend Targets → Forward the Request.
After identifying the appropriate backend, Front Door passes the incoming request to
the available application resource. This resource may be an Azure App Service,
an API endpoint, or another supported backend service.
7. Geo-Redundancy → High Availability
If your application runs across multiple regions, Front Door can automatically
route requests to a region that is currently operational and responding normally.
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Step‑by‑Step Setup
1. Go to Azure Portal
Open portal.azure.com.
Use the global search bar at the top and search for Front Door,
From the search results, choose Front Door and CDN Profiles to access the service.
2. Click Create Front Door
From the Azure portal, open the Front Door service and select the Create option.
The portal then displays the setup interface, where the required Front
Door configuration can be entered.
3. Define Frontend Host
Enter your custom domain, such as www.dailytechcode.com,
or use the default.azurefd.net. This sets the public endpoint that users will access.
4. Configure Backend Pools
Add your backend services like web apps, APIs, or storage accounts.
And add multiple backends to distribute incoming traffic efficiently.
5. Set Routing Rules
Define rules to manage and control traffic flow between the frontend and backend.
Example: /api routes to the API backend, /images routes to storage
6. Add WAF Policies
Associate a Web Application Firewall (WAF) policy with the application to
strengthen security against common web threats by configuring protection rules that detect
and block SQL injection, cross-site scripting (XSS), and DDoS-related attacks.
7. Enable Caching & Acceleration
Enable caching so that content is delivered from servers located close to users.
This makes the response quicker and ensures faster content delivery.
8. Deploy & Monitor with Health Probes
Check all the settings you've set up and click Deploy to create the Front Door profile.
Use Health Probes to keep checking if your backend services are
working and staying healthy.
Conclusion
Here we deployed Front Door successfully, your application is now fast, secure, and globally
available. Health probes keep backends reliable, caching accelerates delivery, and WAF
policies safeguard against threats — all managed through a single global gateway.
Key Takeaways
Unified Entry Point → Azure Front Door acts as a single, intelligent gateway for all global
traffic.
Smart Routing → Requests are automatically directed to the nearest, healthiest backend for
speed and reliability.
Edge Acceleration → Content is cached at edge servers worldwide, cutting down latency
and boosting performance.
Built‑in Security → WAF policies shield applications from DDoS, SQL injection, and XSS
attacks before they reach your backend.
Resilient Architecture → Health probes and geo‑redundancy keep apps available even
during regional failures.