REST API Integration

API Gateway Proxy for REST API Services

Learn how to integrate REST APIs through a gateway proxy layer. This comprehensive guide covers authentication, rate limiting, request transformation, and production-ready patterns.

Explore Implementation →

// Gateway proxy configuration for REST API
const gateway = {
  routes: [{
    path: '/api/v1/*',
    target: 'https://api.example.com',
    methods: ['GET', 'POST', 'PUT'],
    auth: 'bearer',
    rateLimit: { max: 100, window: '1m' }
  }]
};
            

Key Features

01

Request Routing

Intelligent routing based on URL patterns, headers, query parameters, and request body content. Support for wildcard matching and regex patterns.
02

Authentication & Authorization

Multiple auth mechanisms including OAuth 2.0, JWT validation, API keys, and mutual TLS. Fine-grained access control with role-based policies.
03

Request/Response Transformation

Modify headers, query parameters, and body content on the fly. Support for JSON to XML conversion, schema validation, and data mapping.
04

Rate Limiting & Quotas

Protect backend services with configurable rate limits, quotas, and throttling policies. Per-client, per-route, and global limits supported.
05

Caching Strategies

Intelligent response caching with TTL management, cache invalidation, and vary-by header support. Reduce latency and backend load.

Implementation Patterns

Here are the most common patterns for implementing REST API integration through a gateway proxy:

1// Simple proxy configuration
2app.get('/proxy/:service/*', async (req, res) => {
3  const targetService = req.params.service;
4  const path = req.params[0];
5  
6  // Validate authentication
7  const token = req.headers.authorization;
8  await validateToken(token);
9  
10  // Forward request with transformations
11  const response = await proxy.forward(req, {
12    target: `${services[targetService]}/${path}`,
13    headers: { 'X-Request-ID': uuid() }
14  });
15  
16  res.status(response.status).json(response.data);
17});

Gateway Comparison

Compare different gateway solutions for REST API proxying:

Feature	Kong	AWS API Gateway	NGINX
Self-hosted	✓	✗	✓
Serverless	✗	✓	✗
Plugin ecosystem	✓	✓	✗
Free tier	✓	✓	✓

FAQ

What is an API gateway proxy?

An API gateway proxy acts as a reverse proxy that sits between clients and backend services, handling request routing, authentication, rate limiting, and response transformation.

Why use a gateway for REST APIs?

Gateways provide centralized security, simplify client code, enable protocol translation, and offer monitoring and analytics for all API traffic.

How does REST proxy differ from SOAP?

REST proxies typically handle JSON payloads with HTTP methods, while SOAP uses XML with more complex WS-* protocols. REST is generally simpler and more widely adopted.

Can I use GraphQL with API gateway?

Yes, most modern API gateways support GraphQL. Some like Apollo Gateway are specifically designed for GraphQL federation.

API Gateway Proxy for REST API Services

Key Features

Implementation Patterns

Gateway Comparison

FAQ

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