HTTP Status Codes

HTTP Status Codes

InitPHP\HTTP\Message\Response::PHRASES is the lookup table the constructor consults when you don't supply an explicit reason phrase:

Code	Reason Phrase
100	Continue
101	Switching Protocols
102	Processing
103	Early Hints
200	OK
201	Created
202	Accepted
203	Non-Authoritative Information
204	No Content
205	Reset Content
206	Partial Content
207	Multi-status
208	Already Reported
210	Content Different
226	IM Used
300	Multiple Choices
301	Moved Permanently
302	Found
303	See Other
304	Not Modified
305	Use Proxy
306	Switch Proxy
307	Temporary Redirect
308	Permanent Redirect
400	Bad Request
401	Unauthorized
402	Payment Required
403	Forbidden
404	Not Found
405	Method Not Allowed
406	Not Acceptable
407	Proxy Authentication Required
408	Request Time-out
409	Conflict
410	Gone
411	Length Required
412	Precondition Failed
413	Request Entity Too Large
414	Request-URI Too Large
415	Unsupported Media Type
416	Requested range not satisfiable
417	Expectation Failed
418	I'm a teapot
421	Misdirected Request
422	Unprocessable Entity
423	Locked
424	Failed Dependency
425	Unordered Collection
426	Upgrade Required
428	Precondition Required
429	Too Many Requests
431	Request Header Fields Too Large
451	Unavailable For Legal Reasons
500	Internal Server Error
501	Not Implemented
502	Bad Gateway
503	Service Unavailable
504	Gateway Time-out
505	HTTP Version not supported
506	Variant Also Negotiates
507	Insufficient Storage
508	Loop Detected
510	Not Extended
511	Network Authentication Required

Selecting a custom phrase

Pass a reason explicitly when you need something off-canon:

$response = new Response(418, [], null, '1.1', "I'm a coffee maker, actually");
$response = $response->withStatus(599, 'Network connect timeout error');

Validation

Status codes are validated against the inclusive range 100..599 by both the constructor (indirectly, via setStatusCode) and by withStatus(). Anything else raises InvalidArgumentException:

new Response(600);  // InvalidArgumentException
new Response(99);   // InvalidArgumentException

Codes outside the table

Codes that aren't in the table get an empty reason phrase. Many proxies and clients tolerate that; some refuse to parse a status line without a phrase. Pick a phrase yourself if you're emitting a non-standard code:

$response = (new Response())->withStatus(599, 'Network connect timeout error');

v2 → v3 note: 500 phrase typo fix

The 500 entry was previously stored as 'Internal ServerRequest Error' — a copy-paste typo. v3 emits the canonical 'Internal Server Error'. Log-aggregation rules that matched on the literal old string will miss new responses; update them or use the status code instead. See Migration Guide.