HTTP Status Codes, HTTP Headers, CORS Configuration Cheatsheet - Complete Reference 2025

Tue, 23 Dec 2025 00:00:00 +0000

This cheatsheet provides a comprehensive reference for HTTP Status Codes, HTTP Headers, and CORS (Cross-Origin Resource Sharing) configuration. It’s designed for quick lookup, practical examples, and best practices for developers and tech professionals working with web APIs and services.

Quick Reference

Concept	Description	Common Example / Syntax
HTTP Status	Server’s response to a client’s request, indicating success or failure.	`200 OK`, `404 Not Found`, `500 Internal Server Error`
HTTP Header	Metadata sent with HTTP requests and responses.	`Content-Type: application/json`, `Authorization: Bearer ...`
CORS	Mechanism allowing web pages to request resources from a different domain.	`Access-Control-Allow-Origin: https://example.com`
`GET`	Request data from a specified resource.	`GET /users/123`
`POST`	Submit data to be processed to a specified resource.	`POST /users` (with JSON body)
`PUT`	Update a specified resource.	`PUT /users/123` (with JSON body)
`DELETE`	Delete a specified resource.	`DELETE /users/123`
`OPTIONS`	Describe the communication options for the target resource (CORS preflight).	`OPTIONS /api/data`

HTTP Status Codes

HTTP status codes are three-digit numbers returned by a server in response to a client’s request. They are grouped into five classes, indicating the nature of the response.

Project: Interacting with an API

Wed, 03 Dec 2025 00:00:00 +0000

Chapter 17: Project: Interacting with an API

Welcome back, aspiring Pythonista! So far, we’ve learned how to make our Python programs perform calculations, handle data, make decisions, and even manage files. That’s a solid foundation! But what if your program needs to get information from outside itself? What if it needs to talk to other services on the internet?

That’s precisely what we’ll tackle in this exciting chapter: interacting with an API. You’ll discover how to connect your Python applications to external web services, fetch data, and even send information using the power of HTTP requests. This is a fundamental skill for any modern developer, opening up a world of possibilities from building weather apps to automating social media tasks.

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HTTP Status Codes, HTTP Headers, CORS Configuration Cheatsheet - Complete Reference 2025

Quick Reference

HTTP Status Codes

Project: Interacting with an API

Chapter 17: Project: Interacting with an API