DevOps Cheatsheets
Quick-reference cards for everyday developer and network operations. Searchable, filterable, and always available offline after first visit.
1xx — Informational
Continue
Server received request headers; client should proceed.
Switching Protocols
Server agrees to switch protocols (e.g., HTTP → WebSocket).
Processing
Server has received and is processing (WebDAV).
Early Hints
Used to preload resources while server prepares response.
2xx — Success
OK
Standard success response.
Created
Resource successfully created. Typically after POST.
Accepted
Request accepted but not yet completed (async).
No Content
Success with no response body (DELETE operations).
Partial Content
Partial GET response (Range requests).
3xx — Redirection
Moved Permanently
Resource has permanently moved to new URI.
Found
Temporary redirect (legacy).
Not Modified
Client cache is still valid; use cached version.
Temporary Redirect
Temporary redirect, preserves HTTP method.
Permanent Redirect
Permanent redirect, preserves HTTP method.
4xx — Client Errors
Bad Request
Malformed syntax or invalid request message.
Unauthorized
Authentication required.
Forbidden
Authenticated but not authorized.
Not Found
Resource does not exist.
Method Not Allowed
HTTP method not supported for this endpoint.
Request Timeout
Server timed out waiting for request.
Conflict
State conflict (e.g., duplicate resource).
Gone
Resource permanently deleted.
Payload Too Large
Request body exceeds server limit.
Unsupported Media Type
Content-Type not supported.
Unprocessable Entity
Validation errors (WebDAV/REST APIs).
Too Many Requests
Rate limit exceeded.
5xx — Server Errors
Internal Server Error
Generic server-side error.
Not Implemented
Server does not support the request feature.
Bad Gateway
Upstream server returned invalid response.
Service Unavailable
Server temporarily unable to handle requests.
Gateway Timeout
Upstream server timed out.
Loop Detected
Infinite loop detected (WebDAV).