Understand the five categories of HTTP responses.
Section: Status Code Classes
HTTP status code classes
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1xx Informational
2xx Success
3xx Redirection
4xx Client Error
5xx Server ErrorExplanation
HTTP responses are grouped into five classes: informational, successful, redirection, client error, and server error responses. That grouping is reflected in current HTTP references.
Learn the surrounding workflow
Compare similar commands or jump into common fixes when this command is part of a bigger troubleshooting path.
Related commands
Same sheet · prioritizing Status Code Classes
Debug status codes in the right order
A quick flow for deciding where a problem lives.
Check headers and status with curl
Inspect the response line and headers only.
See the full request/response exchange
Use verbose mode to diagnose redirects, TLS, and headers.