Api crash
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This document provides an overview of APIs, including what they are, why they are useful, common data formats like JSON and XML, RESTful API design principles, and how to consume and create APIs. It discusses topics like HTTP verbs, resources and URIs, caching, authentication, rate limiting, and error handling for APIs. The document also provides examples of consuming APIs with tools like Postman and creating a simple API in Node.js.
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What is an API?
Comparing a website to an API
Classification of APIs
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What model does REST use?
REST HTTP Methods
HTTP Codes
The advantages of REST
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CRUD Operations
CRUD Application Example
Simple REST API Implementation in PHP
Web root Folders and Files Structure
MySQL Database
Reading all Products
Reading one Product
Creating a Product
Updating a Product
Deleting a Product
Searching a Product
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c) $x + $y * $x = 10 + 5 * 10 = 10 + 50 = 60
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- 2. WHAT IS AN API? • API = Application Programming Interface • You use API’s all the time. Scanner class Java • Web API: A set of methods exposed over the web via HTTP to allow programmatic access to applications. • Allows you to quickly add functionality/data that others have created. • Very similar to how a web page works
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- 4. HTTP, JSON, XML • Three important technologies that are often used by API’s • HTTP: Hyper text transfer protocol, transfers data over a network • GET : Read • POST : Create • PUT : Update • PATCH : Partial Update • DELETE : Delete • JSON: JavaScript Object Notation, a format for data transfer • {“key”: “value”, “key2”:{“subkey”: 2, “error”: false}} • XML: EXtensible Markup Language: a format for data transfer • Designed to be human and machine readable <?PHP json_decode(‘{“key”:true}’); ?>
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- 7. HOW DO DESIGN AN API • Gather requirements from stakeholders • Create use cases, and decide the functionality needed • Think skeptically, make sure you explore your options • Think ahead, make a flexible system • Easy To learn and use, even without documentation • Hard to misuse • Easy to read and maintain code that uses it • Sufficiently powerful to satisfy requirements and Appropriate to audience • Easy to evolve (Use arrays for example) Rules for a good API
- 8. CREATING A SIMPLE API • You can use any hostable language with a HTTP library (Almost all of them) • Decide your resources, then decide the verbs. • Useful to wireframe the UI at this stage • Connect to persistent data store • Remember the principles of REST • Example in Node.JS: https://github.com/PatrickMurphy/VoteSmart
- 9. ADVANCED TOPICS • Use API Keys • pass as a parameter • Rate Limiting • Headers • X-Rate-Limit-Limit - The number of allowed requests in the current period • X-Rate-Limit-Remaining - The number of remaining requests in the current period • X-Rate-Limit-Reset - The number of seconds left in the current period • Authentication • A REST API should be stateless, send auth with every request • Use ssl, send auth username and base64 password over authentication header • Caching • HTTP Provides this! • Last-Modified header • Etag header, hash or checksum, If-None-Match: “etag” • Errors • { "code" : 1234, "message" : "Something bad happened :(", "description" : "More details about the error here" } • Send HTTP Status 400 level • 401 unauthorized • 403 forbidden • 404 not found • 405 method not allowed • 410 gone (depreciated) • 422 Unprocessable entity (validation) • 429 Too many requests (Rate limit)