→ HTTP Codes → Start Learning

Question		Answer
100 start learning		Continue Server allows client to proceed with request body Client sends large file upload
101 start learning		Switching Protocols Server switches to different protocol HTTP connection upgraded to WebSocket
200 start learning		OK Request processed successfully Successful GET request for resource
201 start learning		Created New resource successfully created POST creates new user
202 start learning		Accepted Request accepted but processing not finished Background job queued
204 start learning		No Content Success with no response body DELETE resource request
206 start learning		Partial Content Partial response for range request Resuming interrupted download
301 start learning		Moved Permanently Permanent redirect to new URL Website moved to new domain
302 start learning		Found Temporary redirect legacy behavior Temporary maintenance redirect
304 start learning		Not Modified Resource not modified cached version valid Browser cache validation
307 start learning		Temporary Redirect Temporary redirect method preserved Temporary API endpoint switch
308 start learning		Permanent Redirect Permanent redirect method preserved API version permanently changed
400 start learning		Bad Request Malformed or invalid request Invalid JSON payload
401 start learning		Unauthorized Authentication required or failed Missing authentication token
403 start learning		Forbidden Authenticated but access denied User lacks required role
404 start learning		Not Found Resource does not exist Requesting non existing endpoint
405 start learning		Method Not Allowed HTTP method not supported POST on read only endpoint
409 start learning		Conflict Request conflicts with current state Updating outdated resource version
410 start learning		Gone Resource permanently removed Deleted API endpoint
415 start learning		Unsupported Media Type Unsupported content type Sending XML to JSON only API
422 start learning		Unprocessable Content Semantic validation error Validation fails for email field
429 start learning		Too Many Requests Too many requests in given time window API rate limit exceeded
500 start learning		Internal Server Error Generic server side failure Unhandled exception occurs
502 start learning		Bad Gateway Invalid response from upstream server Reverse proxy upstream error
503 start learning		Service Unavailable Service temporarily unavailable Server overloaded
504 start learning		Gateway Timeout Upstream server timeout Upstream service slow response

HTTP codes

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