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Avijit Bera
Avijit Bera

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What Is an API Gateway? A Complete Guide for Developers

#apigateway #api #ai #cybersecurity

Modern applications rarely rely on a single backend service. A typical SaaS application may have authentication services, payment APIs, user services, databases, third-party integrations, and multiple microservices running across different environments.

As the number of APIs grows, managing security, authentication, rate limiting, caching, monitoring, routing, and reliability becomes increasingly difficult.

This is where an API gateway comes in.

An API gateway acts as a centralized entry point between clients and backend services. It can authenticate requests, enforce security policies, control traffic, route requests to the appropriate service, cache responses, monitor API performance, and protect backend infrastructure.

In this guide, we'll explain what an API gateway is, how an API gateway works, its architecture, key features, benefits, common use cases, and how to choose between a managed and self-hosted API gateway.

What Is an API Gateway?

An API gateway is a server or managed service that sits between API clients and backend services.

Instead of clients communicating directly with individual backend services, requests first pass through the API gateway.

A simplified architecture looks like this:

                    Clients
                       │
          ┌────────────┼────────────┐
          │            │            │
        Web          Mobile        Third-party
        App            App          Services
          │            │            │
          └────────────┼────────────┘
                       │
                       ▼
                ┌──────────────┐
                │  API Gateway │
                │              │
                │ Authentication
                │ Rate Limiting
                │ WAF
                │ Caching
                │ Routing
                │ Analytics
                └───────┬──────┘
                        │
             ┌──────────┼──────────┐
             ▼          ▼          ▼
          Users       Orders     Payments
          API          API         API
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The gateway becomes the controlled entry point for your APIs.

For example, instead of a mobile application directly calling:

https://users.example.com
https://orders.example.com
https://payments.example.com
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the application can communicate through a gateway:

https://api.example.com/users
https://api.example.com/orders
https://api.example.com/payments
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The API gateway determines where each request should go and which policies should be applied before it reaches your backend.

How Does an API Gateway Work?

An API gateway typically sits at the edge of your application infrastructure.

A request follows a flow similar to:

Client
  │
  ▼
API Gateway
  │
  ├── Authentication
  ├── Security checks
  ├── Rate limiting
  ├── WAF
  ├── Cache lookup
  ├── Request validation
  ├── Routing
  │
  ▼
Backend Service
  │
  ▼
API Gateway
  │
  ├── Response caching
  ├── Logging
  ├── Monitoring
  └── Response processing
  │
  ▼
Client
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The exact pipeline depends on the gateway you use, but the fundamental idea remains the same:

The API gateway controls and manages traffic between clients and backend services.

Why Do You Need an API Gateway?

Without an API gateway, every backend service may need to implement its own security and infrastructure logic.

For example:

Mobile App
   │
   ├──────────► User API
   │              ├── Auth
   │              ├── Rate Limit
   │              └── Logging
   │
   ├──────────► Order API
   │              ├── Auth
   │              ├── Rate Limit
   │              └── Logging
   │
   └──────────► Payment API
                  ├── Auth
                  ├── Rate Limit
                  └── Logging
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This creates duplicated infrastructure logic.

With an API gateway:

                  API Gateway
                 /     |     \
                /      |      \
             User    Orders   Payments
              API      API       API
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Common policies can be centralized.

This can make your backend architecture easier to manage and scale.

Key Features of an API Gateway

API gateways can provide many different capabilities. The exact feature set depends on the product and architecture.

1. API Routing

One of the most fundamental responsibilities of an API gateway is request routing.

For example:

/api/users/*       → User Service
/api/orders/*      → Order Service
/api/payments/*    → Payment Service
/api/products/*    → Product Service
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The gateway examines the incoming request and forwards it to the appropriate backend.

This becomes particularly useful when your application consists of multiple services.

2. Authentication and API Keys

An API gateway can authenticate requests before forwarding them to your backend.

For example:

GET /v1/users
Host: api.example.com
Authorization: Bearer <token>
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or:

GET /v1/users
x-api-key: <api-key>
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The gateway can verify the credentials and reject unauthorized requests before they reach your application.

This provides an additional security layer around your API.

For example, EdgeWrap uses API keys for proxy traffic and management API access. You can generate and manage keys through the EdgeWrap dashboard, while the EdgeWrap authentication documentation explains how API keys are used.

3. Rate Limiting

API rate limiting controls how many requests a client can make within a specific period.

For example:

100 requests / minute / IP
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or:

1,000 requests / minute / API key
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Without rate limiting, a single client could potentially send thousands of requests to your backend.

A gateway can stop excessive traffic before it reaches your origin server.

For example:

Client
   │
   │ 10,000 requests
   ▼
API Gateway
   │
   ├── 9,900 blocked
   │
   └── 100 allowed
             │
             ▼
         Backend API
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Rate limiting is useful for:

  • preventing API abuse
  • protecting databases
  • controlling infrastructure costs
  • preventing accidental traffic spikes
  • protecting authentication endpoints
  • enforcing API quotas

4. Web Application Firewall (WAF)

A Web Application Firewall, commonly called a WAF, analyzes incoming requests and attempts to identify malicious traffic.

A WAF can help protect APIs against common attacks such as:

  • SQL injection
  • Cross-site scripting (XSS)
  • Remote code execution
  • malicious request patterns
  • suspicious IP addresses
  • unwanted traffic patterns

For example:

Attacker
   │
   ▼
API Gateway
   │
   ├── WAF detects malicious request
   │
   ▼
BLOCK
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The request never reaches the backend application.

EdgeWrap provides a built-in WAF that can block common attack patterns and supports custom rules for IP addresses, countries, and request patterns.

5. DDoS Protection

Distributed Denial-of-Service attacks attempt to overwhelm an application with large amounts of traffic.

A gateway positioned at the edge can help absorb, rate-limit, challenge, or block malicious traffic before it reaches your origin infrastructure.

A simplified architecture looks like this:

                    Internet
                       │
            ┌──────────┴──────────┐
            │                     │
        Legitimate              Attack
          Users                 Traffic
            │                     │
            └──────────┬──────────┘
                       ▼
                 API Gateway
                       │
              ┌────────┴────────┐
              │                 │
           Allowed            Blocked
              │                 │
              ▼                 X
          Origin API
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This is particularly important for public APIs and APIs that handle high-value operations.

6. API Caching

API gateways can also cache responses.

Suppose your API receives:

GET /api/products
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If the response doesn't change frequently, repeatedly querying your database may be unnecessary.

Instead:

First request
     │
     ▼
API Gateway
     │
     ▼
Backend
     │
     ▼
Cache response
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Future requests can potentially be served directly from the cache:

Client
  │
  ▼
API Gateway
  │
  ▼
Cache HIT
  │
  ▼
Response
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This can:

  • reduce database queries
  • reduce backend CPU usage
  • improve response times
  • reduce infrastructure costs
  • handle traffic spikes more efficiently

EdgeWrap supports edge caching for GET responses with configurable TTLs per path.

7. Load Balancing and Routing

An API gateway can distribute requests across multiple backend servers or regions.

For example:

                  API Gateway
                       │
          ┌────────────┼────────────┐
          ▼            ▼            ▼
       Server 1     Server 2     Server 3
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If one server becomes unhealthy, the gateway can potentially stop sending traffic to it.

With multiple regions, routing can also look like:

                    API Gateway
                         │
              ┌──────────┼──────────┐
              ▼          ▼          ▼
             US         EU        Asia
           Origin     Origin      Origin
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This can help reduce latency and improve availability.

8. Circuit Breakers

A circuit breaker helps prevent a failing backend service from being overwhelmed by continuous requests.

Imagine your payment service starts returning errors:

500
500
500
500
500
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Without protection, clients may continue sending requests.

A circuit breaker can detect repeated failures and temporarily stop forwarding requests.

Healthy
   │
   ▼
Failures increase
   │
   ▼
Circuit Opens
   │
   ▼
Requests stop reaching origin
   │
   ▼
Origin recovers
   │
   ▼
Circuit closes
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Circuit breakers are especially useful in distributed systems and microservice architectures.

9. API Analytics and Monitoring

Another important role of an API gateway is observability.

Instead of looking at logs from every backend service separately, you can analyze traffic at the gateway layer.

Useful metrics include:

  • request count
  • latency
  • error rate
  • HTTP status codes
  • cache hit rate
  • top endpoints
  • geographic traffic
  • blocked requests
  • rate-limited requests
  • bot traffic

For example:

API Traffic

Requests:       2,450,000
Error Rate:     0.42%
P95 Latency:    83ms
Cache Hit Rate: 71%

Top Endpoints:

/api/products    34%
/api/users       21%
/api/orders      16%
/api/config       9%
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EdgeWrap provides real-time analytics for API traffic, including latency, cache hit rate, error rate, top paths, country breakdown, WAF blocks, and bot traffic.

10. Logging and Sensitive Data Protection

API logs can contain sensitive information.

For example:

{
  "email": "user@example.com",
  "apiKey": "sk_live_xxxxx",
  "token": "eyJhbGci..."
}
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Logging this information without protection can create security and compliance problems.

Some API gateways provide mechanisms for removing or masking sensitive values before they are stored in logs.

EdgeWrap's Secret Shield is designed to redact API keys, tokens, and personally identifiable information from request and response bodies before logging.

API Gateway Architecture

A typical API gateway architecture can be divided into several layers.

                   CLIENTS
                      │
                      ▼
             ┌─────────────────┐
             │   Edge Layer    │
             │                 │
             │ TLS / SSL       │
             │ DDoS Protection  │
             │ Bot Detection   │
             └────────┬────────┘
                      │
                      ▼
             ┌─────────────────┐
             │ Security Layer  │
             │                 │
             │ Authentication  │
             │ WAF             │
             │ Rate Limiting   │
             └────────┬────────┘
                      │
                      ▼
             ┌─────────────────┐
             │ Performance     │
             │                 │
             │ Cache           │
             │ Compression     │
             │ Routing         │
             └────────┬────────┘
                      │
                      ▼
             ┌─────────────────┐
             │ Origin Services │
             │                 │
             │ Node.js         │
             │ Python          │
             │ Go              │
             │ Java            │
             └────────┬────────┘
                      │
                      ▼
             ┌─────────────────┐
             │ Observability   │
             │                 │
             │ Logs            │
             │ Metrics         │
             │ Analytics       │
             └─────────────────┘
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The gateway can therefore become the central control plane for API traffic.

API Gateway vs Reverse Proxy

API gateways and reverse proxies are closely related, but they are not exactly the same.

A reverse proxy primarily sits in front of backend servers and forwards requests.

An API gateway generally provides additional API-specific capabilities.

Feature Reverse Proxy API Gateway
Request forwarding Yes Yes
Load balancing Usually Usually
TLS termination Yes Yes
API authentication Limited/optional Common
API rate limiting Optional Common
API keys Usually custom Common
WAF Optional Common
API analytics Limited Common
API caching Optional Common
Request transformation Sometimes Common
API policies Limited Extensive

In practice, the distinction can blur because modern reverse proxies and API gateways increasingly overlap.

The important difference is the level of API-specific management and policy enforcement.

API Gateway vs Load Balancer

A load balancer primarily distributes traffic between multiple servers.

For example:

Load Balancer
     │
 ┌───┼───┐
 ▼   ▼   ▼
S1  S2  S3
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An API gateway can do this too, but usually provides a broader set of API capabilities:

API Gateway
   │
   ├── Authentication
   ├── Rate Limiting
   ├── WAF
   ├── Caching
   ├── Routing
   ├── Analytics
   ├── Load Balancing
   └── Circuit Breaker
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Therefore, a load balancer and an API gateway can coexist.

API Gateway vs CDN

A CDN primarily distributes and caches content closer to users.

An API gateway focuses on controlling and managing API traffic.

There is some overlap.

Modern edge platforms increasingly combine both concepts:

                 Edge Platform
                       │
          ┌────────────┼────────────┐
          ▼            ▼            ▼
        CDN       API Gateway      WAF
          │            │            │
          └────────────┼────────────┘
                       ▼
                    Origin
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For APIs, an edge API gateway can combine caching and traffic management with API-specific security and routing.

API Gateway for Microservices

API gateways are particularly common in microservice architectures.

Imagine an application with:

User Service
Order Service
Payment Service
Inventory Service
Notification Service
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Without a gateway, clients may need to know about each service.

Mobile App
 ├── User Service
 ├── Order Service
 ├── Payment Service
 ├── Inventory Service
 └── Notification Service
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This tightly couples the client to your internal architecture.

With an API gateway:

                 Mobile App
                     │
                     ▼
                API Gateway
                     │
       ┌─────────────┼─────────────┐
       ▼             ▼             ▼
     Users         Orders       Payments
    Service        Service        Service
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The client only needs to know about the gateway.

This allows backend services to evolve without exposing the entire internal architecture.

API Gateway for SaaS Applications

SaaS applications often have:

  • web applications
  • mobile applications
  • public APIs
  • internal services
  • third-party integrations
  • background workers
  • webhooks

An API gateway can provide a consistent layer for managing these requests.

For example:

                     SaaS Clients
                          │
                          ▼
                    API Gateway
                          │
       ┌──────────────────┼─────────────────┐
       ▼                  ▼                 ▼
    Public API        Internal APIs      Webhooks
       │                  │                 │
       ▼                  ▼                 ▼
   SaaS Backend      Microservices       Workers
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This can make security, traffic control, monitoring, and routing easier to manage as the application grows.

What Is an Edge API Gateway?

Traditional API gateways may run in a centralized cloud region.

An edge API gateway places API processing closer to the user.

Instead of:

User
 │
 ▼
Internet
 │
 ▼
Central Region
 │
 ▼
API Gateway
 │
 ▼
Origin
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an edge architecture can look like:

             Global Users
                  │
       ┌──────────┼──────────┐
       ▼          ▼          ▼
      US         EU         Asia
      Edge       Edge       Edge
       │          │          │
       └──────────┼──────────┘
                  ▼
                Origin
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This can reduce network latency and allow security and traffic policies to be enforced before requests reach your backend.

EdgeWrap is designed around this model. It sits in front of your API and applies security, caching, routing, and observability at the edge.

You can connect an origin server through the EdgeWrap dashboard and follow the EdgeWrap documentation to configure your gateway.

Managed API Gateway vs Self-Hosted API Gateway

There are two common approaches to deploying an API gateway.

Self-hosted API gateway

You operate the infrastructure yourself.

Examples of responsibilities include:

  • deployment
  • scaling
  • updates
  • security
  • monitoring
  • high availability
  • TLS certificates
  • networking
  • disaster recovery

A simplified architecture:

Your Team
   │
   ▼
API Gateway Infrastructure
   │
   ▼
Backend
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This gives you more control, but also more operational responsibility.

Managed API gateway

With a managed service, the provider operates much of the gateway infrastructure.

Your workflow can become:

Create Gateway
      │
      ▼
Connect Origin
      │
      ▼
Configure Policies
      │
      ▼
Send API Traffic
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This can be attractive for startups and development teams that want API security and infrastructure features without operating the gateway themselves.

How to Choose an API Gateway

When evaluating an API gateway, look beyond the number of features.

Consider the following.

1. Security

Does it provide:

  • WAF?
  • DDoS protection?
  • authentication?
  • API keys?
  • bot protection?
  • IP filtering?

2. Performance

Check:

  • edge locations
  • latency
  • caching
  • routing
  • origin connection performance

3. Reliability

Look for:

  • health checks
  • failover
  • circuit breakers
  • retries
  • multi-region support

4. Observability

Check whether you can monitor:

  • requests
  • latency
  • errors
  • cache performance
  • security events
  • traffic patterns

5. Developer experience

A good API gateway should be straightforward to configure.

You should be able to:

Connect Origin
      ↓
Create API Key
      ↓
Configure Rules
      ↓
Change API Endpoint
      ↓
Start Monitoring
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6. Pricing

Don't only compare the monthly subscription.

Consider:

  • request volume
  • bandwidth
  • API calls
  • AI usage
  • log retention
  • number of origins
  • number of projects
  • additional infrastructure fees

When Should You Use an API Gateway?

An API gateway is particularly useful when you have one or more of these requirements:

You have multiple backend services 

Users → Gateway → Services
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You expose a public API

You need centralized security and rate limiting.

Your API receives unpredictable traffic

A gateway can help control traffic before it reaches your origin.

You need API caching

Caching can reduce backend load and improve response times.

You need centralized API monitoring

The gateway provides a single observation point for traffic.

You operate APIs in multiple regions

Routing can direct users to appropriate origins.

You don't want to manage gateway infrastructure

A managed API gateway can reduce operational overhead.

When You Might Not Need an API Gateway

An API gateway isn't automatically necessary for every application.

For a small application such as:

Frontend
   │
   ▼
One Backend
   │
   ▼
Database
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adding another infrastructure layer may not provide enough value.

You might simply use:

Client → Backend
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As your API grows, however, centralized traffic management becomes increasingly valuable.

A good rule is:

Use an API gateway when the benefits of centralized API security, traffic management, routing, caching, or observability outweigh the complexity of adding another layer.

Example: Putting an API Gateway in Front of a Node.js API

Suppose your Node.js backend runs at:

https://api.example.com
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Without an API gateway:

Client
   │
   ▼
Node.js API
   │
   ▼
PostgreSQL
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With an edge API gateway:

Client
   │
   ▼
Edge API Gateway
   │
   ├── WAF
   ├── DDoS protection
   ├── Rate limiting
   ├── Cache
   ├── Authentication
   ├── Analytics
   └── Routing
   │
   ▼
Node.js API
   │
   ▼
PostgreSQL
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The application itself doesn't necessarily need to implement every infrastructure concern.

This separation allows the application team to focus more on business logic.

How EdgeWrap Fits Into an API Architecture

EdgeWrap is a managed edge API gateway designed to protect, accelerate, and monitor API traffic.

The basic architecture is:

                    Your Clients
                         │
                         ▼
                 ┌───────────────┐
                 │    EdgeWrap   │
                 │               │
                 │ DDoS Shield   │
                 │ Bot Detection│
                 │ WAF           │
                 │ Rate Limiting │
                 │ Secret Shield │
                 │ Smart Routing │
                 │ Edge Cache    │
                 │ Auto Healer   │
                 │ Analytics     │
                 └───────┬───────┘
                         │
                         ▼
                    Your Origin
                         │
              ┌──────────┼──────────┐
              ▼          ▼          ▼
            Node.js    Python       Go
              │          │          │
              └──────────┼──────────┘
                         ▼
                      Database
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According to the EdgeWrap documentation, requests sent through its edge proxy are authenticated, evaluated against security and cache policies, and then forwarded to the origin when appropriate. Responses can then be cached and logged before being returned to the client.

You can start configuring an API gateway from the EdgeWrap dashboard or learn more about the implementation through the EdgeWrap documentation.

Benefits of Using an API Gateway

The main benefits can be summarized as follows:

Benefit Why It Matters
Centralized security Apply security policies in one place
Authentication Control who can access APIs
Rate limiting Prevent API abuse
DDoS protection Protect backend infrastructure
WAF Block common web attacks
Caching Reduce origin requests
Routing Direct requests to appropriate services
Load balancing Distribute traffic
Circuit breaking Improve resilience
Analytics Understand API traffic
Logging Centralize API observability
Edge processing Move traffic decisions closer to users

API Gateway Best Practices

If you're implementing an API gateway, consider these best practices.

1. Keep the gateway focused

Avoid putting business logic into the gateway.

The gateway should primarily handle infrastructure concerns such as:

Authentication
Security
Routing
Rate limiting
Caching
Observability
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Your backend should continue handling business logic.

2. Use rate limits appropriate for each endpoint

A login endpoint may require much stricter limits than a public product catalog.

For example:

POST /login
10 requests/minute/IP

GET /products
500 requests/minute/IP
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3. Cache only appropriate responses

Not every API response should be cached.

Be particularly careful with:

  • user-specific data
  • payment information
  • authentication responses
  • sensitive information
  • frequently changing resources

Use appropriate cache headers and TTLs.

4. Monitor gateway performance

Track:

  • latency
  • errors
  • traffic
  • cache hit ratio
  • blocked requests
  • origin health

This allows you to identify problems before they become major outages.

5. Protect the origin

If your gateway is supposed to protect your origin, make sure the origin cannot simply be accessed directly by attackers.

The goal should be:

Internet
   │
   ▼
API Gateway
   │
   ▼
Protected Origin
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rather than:

Internet ──────────► Origin
    │
    └──────────────► API Gateway
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Frequently Asked Questions

What is an API gateway in simple terms?

An API gateway is a layer that sits between your clients and backend APIs. It receives requests, applies policies such as authentication, security, rate limiting, caching, and routing, and then forwards valid requests to the appropriate backend service.

Is an API gateway the same as a reverse proxy?

Not exactly. A reverse proxy forwards traffic between clients and servers, while an API gateway generally provides additional API-specific functionality such as authentication, rate limiting, API keys, caching, analytics, and policy management.

Is an API gateway required for microservices?

No. Microservices can work without an API gateway, but a gateway can simplify client access, security, routing, authentication, and traffic management as the number of services increases.

Does an API gateway improve API performance?

It can. Features such as edge caching, connection optimization, routing, and traffic control can reduce latency and backend load. The actual improvement depends on your architecture and traffic patterns.

Does an API gateway protect against DDoS attacks?

Many modern API gateways provide DDoS mitigation or integrate with dedicated DDoS protection services. The level of protection varies by provider and plan.

Can an API gateway cache API responses?

Yes. Many API gateways support response caching, especially for GET requests. Proper cache policies are important because caching user-specific or sensitive responses incorrectly can create security problems.

What is an edge API gateway?

An edge API gateway processes API traffic at distributed edge locations closer to users rather than relying solely on a centralized gateway location. This can reduce network latency and allow security and traffic policies to be enforced closer to the source of the request.

Should I use a managed or self-hosted API gateway?

A managed API gateway can be a good choice if you want to minimize infrastructure operations. A self-hosted gateway may be preferable when you need maximum control over infrastructure, networking, customization, or deployment.

Final Thoughts

An API gateway is more than just a proxy.

For modern applications, it can become a central layer for:

                 API Gateway
                      │
       ┌──────────────┼──────────────┐
       ▼              ▼              ▼
    Security       Performance    Reliability
       │              │              │
      WAF           Cache          Failover
      DDoS          Routing        Circuit Breaker
      Auth          Edge           Monitoring
      Rate Limit
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As applications grow from a single backend into SaaS platforms, microservices, public APIs, and multi-region architectures, centralized API traffic management becomes increasingly valuable.

The right API gateway can help your team secure APIs, control traffic, reduce backend load, improve reliability, and understand what's happening across your API infrastructure without forcing every backend service to implement the same infrastructure logic.

If you're looking for a managed approach, you can start with EdgeWrap or explore the EdgeWrap API gateway documentation to see how it can sit in front of your existing API without requiring major changes to your backend.

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