Azure API Management acts as a gateway that sits between client applications and your backend services. Think of it as a front door with a security guard—clients talk to the gateway, and the gateway talks to the actual services behind the scenes. This setup hides how your backend works and lets you apply security rules in one central place instead of on every individual service.
You can use Private Link to remove public internet access to your API Management instance entirely. When you enable this, all traffic flows through Azure's private network instead of the open internet. This means attackers scanning for public endpoints cannot reach your APIs at all. The gateway still works normally, but it lives inside your virtual network where you control who can reach it.
The gateway supports several ways to check client identity before allowing any request through. OAuth 2.0 is the modern standard—clients obtain a token after proving their identity, then present that token with each request. Client certificates work similarly to how HTTPS works: the client presents a digital certificate during the connection handshake, proving it holds the matching private key. Managed identities let Azure services automatically get tokens without storing passwords anywhere. The gateway validates these credentials before passing requests to your backend, so unauthorized callers never reach your actual code.
When a request carries a JWT token, the gateway can validate the signature, check if the token has expired, and verify that the caller has permission to access the requested operation. You can enforce scope checks to ensure a client with read-only access cannot call write operations. Subscription keys provide an additional layer—you issue keys to developers, and the gateway tracks usage by key so you know which client is calling how often.
Policies are rules that the gateway applies to traffic as it passes through. TLS enforcement requires all connections to use encryption—requests arriving over plain HTTP get rejected. IP restrictions let you block traffic from unknown addresses or allow only specific corporate ranges. Rate limiting prevents any single client from overwhelming your backend by capping how many requests they can make per minute. CORS policies control which web browsers can call your APIs from JavaScript, preventing unauthorized cross-site requests. You can stack these policies together, applying some globally and others only to specific APIs or operations.
The gateway can also detect and block attack patterns before they reach your backend. Inbound threat detection looks for signs of malicious behavior such as SQL injection attempts or unusual request volumes that suggest a DDoS attack. When the gateway spots these patterns, it blocks the request immediately, keeping your backend safe without your services needing to handle the attack themselves.
The Developer Portal provides a self-service website where developers can explore your APIs, read documentation, and obtain subscription keys. You create products to group related APIs together—a product might contain all the APIs needed for a mobile app, for example. Each product can require subscription approval before a developer can access it, or can allow open access. This workflow ensures that only registered, approved developers can call your secured APIs, and you can revoke access by disabling their subscription at any time.
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Azure API Management acts as a gateway that sits between client applications and your backend services, hiding how your backend works and letting you apply security rules in one central place instead of on every individual service.
When you enable Private Link, all traffic flows through Azure's private network instead of the open internet, so attackers scanning for public endpoints cannot reach your APIs at all, while the gateway still works normally inside your virtual network.
Azure API Management supports OAuth 2.0, client certificates, and managed identities to verify client identity before allowing any request through, validating these credentials before passing requests to your backend so unauthorized callers never reach your actual code.
When a request carries a JWT token, the gateway can validate the signature, check if the token has expired, and verify that the caller has permission to access the requested operation, including enforcing scope checks to ensure a client with read-only access cannot call write operations.
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