Códigos de status HTTP
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Definição
Códigos de três dígitos retornados por um servidor web indicando o resultado de uma requisição. Organizados em classes: 1xx (informacional), 2xx (sucesso), 3xx (redirecionamento), 4xx (erro do cliente) e 5xx (erro do servidor).
How Status Codes Are Organized
HTTP status codes are grouped into five classes by their leading digit. 1xx codes are informational — they tell the client that a request was received and processing is underway. 2xx codes signal success: a 200 OK means the resource was delivered, while a 201 Created confirms that a new resource was stored server-side. 3xx codes handle redirects, with 301 (Moved Permanently) and 302 (Found) being the most common. 4xx codes represent client-side errors: 404 Not Found, 403 Forbidden, and 429 Too Many Requests all indicate that the problem originates from the request itself. 5xx codes point to server-side failures such as 500 Internal Server Error or 503 Service Unavailable.
Why They Matter for Networking and SEO
Status codes are surfaced in HTTPHypertext Transfer Protocol. The application-layer protocol for transmitting web pages, APIs, and other resources. HTTP defines methods (GET, POST, PUT, DELETE) and status codes for client-server communication. response headers long before any HTML body arrives. Network engineers rely on them to diagnose routing and caching problems, and CDNContent Delivery Network. A geographically distributed network of servers that caches and serves content from locations close to end users, reducing latency and improving load times. Major providers include Cloudflare, AWS CloudFront, and Akamai. edge nodes use them to decide whether a response is cacheable. A 304 Not Modified tells a cache it can serve its stored copy without downloading fresh content. Search engines also interpret codes: a 410 Gone permanently de-indexes a page faster than a 404.
Inspecting Headers in Practice
Use HTTP Header Analyzer to view the exact status code and response headers for any URL without loading the page in a browser. Pairing status code inspection with Reverse ProxyA server that sits in front of backend servers, forwarding client requests and returning responses on their behalf. Used for SSL termination, load balancing, caching, and hiding the origin server's identity. logs gives a full picture of where in the request chain a failure originated.