DevOps Encyclopedia
A technical reference library covering the tools, concepts, protocols, and systems that power modern infrastructure.
Explore Topics
Browse concepts grouped by technology and domain.
DNS
Explore how DNS works, from domain lookups and records to troubleshooting real-world networking problems. Learn the system that connects names on the internet to the services behind them.
HTTP
Explore the protocol that powers the web, from HTTP requests and responses to status codes, headers, and troubleshooting common web problems.
Latest Entries
Recently added concepts to the encyclopedia.
What is DNS
Dns testing excerpt
5xx Server Error Responses
HTTP 5xx Server Error Responses indicate that the server failed while processing a valid request. Learn how codes like 500, 502, 503, and 504 help DevOps engineers troubleshoot production failures.
4xx Client Error Responses
HTTP 4xx Client Error Responses indicate that a request could not be completed because of a problem with the client request. Learn how codes like 400, 401, 403, and 404 are used.
3xx Redirection Responses
HTTP 3xx Redirection Responses indicate that additional action is required before a request can be completed. Learn how redirects work and how codes like 301, 302, and 304 are used.
2xx Successful Responses
HTTP 2xx Successful Responses indicate that a request was successfully received, understood, and processed by the server. Learn how common success codes like 200, 201, and 204 are used in modern web applications and APIs.
200 OK
The HTTP 200 OK status code indicates that a request was successfully completed. Learn how it is used in web applications, APIs, and infrastructure systems.