Core Building Blocks Every Tech Professional Should Know

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HTTP Methods

  • GET — Retrieve data
  • POST — Create new data
  • PUT — Fully update existing data
  • PATCH — Partially update data
  • DELETE — Remove data
  • HEAD — Retrieve headers only
  • OPTIONS — Discover supported methods
  • TRACE — Diagnostic tracing

API Types

  • REST — Standardized resource-based APIs
  • GraphQL — Flexible, query-based APIs
  • WebSocket — Real-time, full-duplex communication
  • gRPC — High-performance, binary RPC
  • MQTT — Lightweight messaging for IoT
  • SOAP — Enterprise legacy protocol

Authentication Protocols

  • JWT (JSON Web Tokens)
  • OAuth 2.0
  • API Keys
  • Basic Auth
  • Bearer Token
  • OpenID Connect

Best Practices for API Development

  • Enforce HTTPS everywhere
  • Handle errors gracefully
  • Implement API versioning
  • Add pagination for large datasets
  • Apply rate limiting to prevent abuse
  • Maintain consistent naming conventions
  • Prioritize clear documentation
  • Build a smart caching strategy

You Should Know:

HTTP Methods in Action

 GET Request (cURL) 
curl -X GET https://api.example.com/users

POST Request (Python Requests) 
import requests 
response = requests.post("https://api.example.com/users", json={"name": "John Doe"})

PUT Request (JavaScript Fetch) 
fetch("https://api.example.com/users/1", { 
method: "PUT", 
body: JSON.stringify({ name: "Jane Doe" }) 
});

DELETE Request (cURL) 
curl -X DELETE https://api.example.com/users/1

Testing APIs with Postman

1. GET Request

  • Set method to GET
  • Enter URL: `https://api.example.com/users`
    – Send & verify response

    2. POST Request

    – Set method to POST
    – Enter URL: `https://api.example.com/users`

  • Add JSON body: `{“name”: “New User”}`
  • Send & check status code (201 Created)

Rate Limiting in Nginx

limit_req_zone $binary_remote_addr zone=api_limit:10m rate=10r/s;

server { 
location /api/ { 
limit_req zone=api_limit burst=20 nodelay; 
proxy_pass http://backend; 
} 
}

JWT Authentication (Node.js Example)

const jwt = require('jsonwebtoken');

// Generate Token 
const token = jwt.sign({ userId: 123 }, 'secret_key', { expiresIn: '1h' });

// Verify Token 
jwt.verify(token, 'secret_key', (err, decoded) => { 
if (err) console.error("Invalid token"); 
else console.log(decoded.userId); 
});

OAuth 2.0 with cURL

 Request Access Token 
curl -X POST https://oauth.example.com/token \ 
-d "client_id=CLIENT_ID" \ 
-d "client_secret=CLIENT_SECRET" \ 
-d "grant_type=client_credentials"

GraphQL Query Example

query { 
user(id: "1") { 
name 
email 
} 
}

gRPC with Protocol Buffers

syntax = "proto3";

service UserService { 
rpc GetUser (UserRequest) returns (UserResponse); 
}

message UserRequest { 
int32 id = 1; 
}

message UserResponse { 
string name = 1; 
string email = 2; 
}

What Undercode Say

Mastering HTTP methods, API types, and authentication protocols is essential for modern tech professionals. Implementing best practices like HTTPS enforcement, rate limiting, and JWT security ensures robust API development. Automation with cURL, Postman, and Nginx enhances efficiency, while GraphQL and gRPC offer advanced data handling.

Expected Output

  • Secure API endpoints with OAuth 2.0 & JWT
  • Optimize performance with caching & rate limiting
  • Improve debugging with TRACE & OPTIONS
  • Use Postman & cURL for API testing

Relevant URLs:

Prediction

API security and real-time communication (WebSocket, gRPC) will dominate future tech stacks, with AI-driven API documentation becoming standard.

References:

Reported By: Ashsau Heres – Hackers Feeds
Extra Hub: Undercode MoN
Basic Verification: Pass ✅

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