Web Development39 entries

HTTP Status Codes

Complete HTTP status code reference: 1xx informational through 5xx server errors

11xx Informational

`100 Continue`	Server received request headers, client should send body
`101 Switching Protocols`	Server is changing protocols (e.g., to WebSocket)
`103 Early Hints`	Preload resources while server prepares response

`200 OK`	Request succeeded
`201 Created`	Resource created successfully (POST/PUT)
`202 Accepted`	Request accepted for processing (async)
`204 No Content`	Success but no response body (DELETE)
`206 Partial Content`	Partial resource returned (range request)

`301 Moved Permanently`	Resource permanently moved to new URL
`302 Found`	Temporary redirect (method may change)
`303 See Other`	Redirect with GET to different URI
`304 Not Modified`	Cached version is still valid
`307 Temporary Redirect`	Temporary redirect (preserves method)
`308 Permanent Redirect`	Permanent redirect (preserves method)

`400 Bad Request`	Invalid request syntax or parameters
`401 Unauthorized`	Authentication required
`403 Forbidden`	Authenticated but not authorized
`404 Not Found`	Resource does not exist
`405 Method Not Allowed`	HTTP method not supported for this URL
`408 Request Timeout`	Server timed out waiting for request
`409 Conflict`	Request conflicts with current state
`410 Gone`	Resource permanently deleted
`413 Payload Too Large`	Request body exceeds server limit
`415 Unsupported Media Type`	Content-Type not supported
`422 Unprocessable Entity`	Request is well-formed but has semantic errors
`429 Too Many Requests`	Rate limit exceeded

`500 Internal Server Error`	Generic server error
`501 Not Implemented`	Server does not support the method
`502 Bad Gateway`	Invalid response from upstream server
`503 Service Unavailable`	Server temporarily overloaded/down
`504 Gateway Timeout`	Upstream server timed out

`Content-Type: application/json`	Response body format
`Authorization: Bearer <token>`	Authentication token
`Cache-Control: max-age=3600`	Cache for 1 hour
`Content-Length: 1234`	Size of response body in bytes
`Accept: application/json`	Client expects JSON response
`X-Rate-Limit-Remaining: 99`	API rate limit remaining
`Location: /new-url`	Redirect target URL
`ETag: "abc123"`	Resource version identifier

useState, useEffect, useRef, useMemo, React 19 hooks, and custom hook patterns

Flex container and item properties, alignment, ordering, and common layout patterns

Grid container and item properties, template areas, auto-placement, and responsive grids