{
    "content": "<h1>Understanding RESTful APIs<\/h1><p>A <a href=\"..\/REST\/\">REST<\/a> (Representational State Transfer) API is an architectural style for an application programming interface (<a href=\"..\/API\/\">API<\/a>) that uses <a href=\"..\/HTTP\/\">HTTP<\/a> requests to access and use data. Originally defined by <a href=\"..\/Roy-Fielding\/\">Roy Fielding<\/a> in his 2000 doctoral dissertation, the <a href=\"..\/RESTful-API\/\">RESTful-API<\/a> has become the industry standard for building <a href=\"..\/Web-Services\/\">Web-Services<\/a> due to its lightweight nature and scalability.<\/p><h2>Core Principles and Constraints<\/h2><p>To be considered truly RESTful, a system must adhere to several key architectural constraints:<\/p><ul><li><strong>Statelessness:<\/strong> The <a href=\"..\/Server\/\">Server<\/a> does not store any client context between requests. Each request from the <a href=\"..\/Client\/\">Client<\/a> must contain all the information necessary to service the request.<\/li><li><strong>Client-Server Architecture:<\/strong> The user interface concerns are separated from the data storage concerns, allowing both to evolve independently.<\/li><li><strong>Cacheability:<\/strong> Responses must explicitly define themselves as cacheable or non-cacheable to improve network efficiency.<\/li><li><strong>Uniform Interface:<\/strong> By applying a software engineering principle of generality to the component interface, the overall system architecture is simplified. This involves using <a href=\"..\/URI\/\">URI<\/a>s to identify <a href=\"..\/Resources\/\">Resources<\/a>.<\/li><li><strong>Layered System:<\/strong> A client cannot ordinarily tell whether it is connected directly to the end server or to an intermediate like a load balancer or <a href=\"..\/Proxy\/\">Proxy<\/a>.<\/li><\/ul><h2>Communication and Data Formats<\/h2><p>RESTful systems typically communicate over the <a href=\"..\/HTTP\/\">HTTP<\/a> protocol using standard verbs. The most common <a href=\"..\/HTTP-Methods\/\">HTTP-Methods<\/a> include GET for retrieving data, POST for creating data, PUT for updating data, and DELETE for removing data. While REST is not tied to a specific format, <a href=\"..\/JSON\/\">JSON<\/a> (JavaScript Object Notation) is the most widely used format for data exchange, followed by <a href=\"..\/XML\/\">XML<\/a>.<\/p><p>For further technical documentation, consult the <a href=\"https:\/\/developer.mozilla.org\/en-US\/docs\/Glossary\/REST\">MDN Web Docs<\/a> or the <a href=\"https:\/\/www.w3.org\/TR\/dwbp\/#intro-rest\">W3C Data on the Web Best Practices<\/a> regarding REST.<\/p><h3>Related Topics<\/h3><ul><li><a href=\"..\/GraphQL\/\">GraphQL<\/a><\/li><li><a href=\"..\/Microservices\/\">Microservices<\/a><\/li><li><a href=\"..\/OAuth2\/\">OAuth2<\/a><\/li><li><a href=\"..\/SOAP\/\">SOAP<\/a><\/li><\/ul>",
    "tags": [
        "api",
        "rest",
        "http",
        "json",
        "web-development",
        "backend",
        "architecture",
        "software-engineering",
        "microservices",
        "programming"
    ]
}