Which status codes are covered?

Every IANA-registered HTTP status code, grouped into 1xx Informational, 2xx Success, 3xx Redirection, 4xx Client Error, and 5xx Server Error. Each entry includes the official reason phrase, what the code actually means in plain English, common scenarios, and which RFC defines it.

When should I use 401 vs 403?

401 Unauthorized means 'you are not authenticated — please log in (or send valid credentials) and try again'; the response should include a WWW-Authenticate header. 403 Forbidden means 'I know who you are, and you are not allowed to do this regardless'. In short: 401 = identity unknown, 403 = identity known but rejected.

What about 404 vs 410 — which should I use when deleting a resource?

Use 410 Gone when a resource has been intentionally removed and will not come back; it tells crawlers to de-index it. Use 404 Not Found when the resource might return later, or when the URL was never valid in the first place. Most APIs stick to 404 for simplicity, but 410 is the semantically correct choice for a permanent deletion.

Is anything uploaded when I search?

No. The catalog is static client-side data and the search filter runs entirely in your browser; no query is sent to a server.

HTTP Status Code Reference

Comprehensive HTTP status code reference with detailed explanations, examples, and common use cases

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1xx Info

2xx Success

3xx Redirect

4xx Client

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Status Code Reference
30 codes

100

Continue

Informational

The server has received the request headers and the client should proceed to send the request body.

101

Switching Protocols

Informational

The requester has asked the server to switch protocols and the server has agreed to do so.

102

Processing

Informational

The server has received and is processing the request, but no response is available yet.

200

Success

The request was successful and the server has returned the requested data.

201

Created

Success

The request was successful and a new resource was created as a result.

202

Accepted

Success

The request has been accepted for processing, but the processing has not been completed.

204

No Content

Success

The server successfully processed the request but is not returning any content.

206

Partial Content

Success

The server is delivering only part of the resource due to a range header sent by the client.

301

Moved Permanently

Redirection

The requested resource has been permanently moved to a new URL.

302

Found

Redirection

The requested resource resides temporarily under a different URL.

304

Not Modified

Redirection

The resource has not been modified since the version specified by the request headers.

307

Temporary Redirect

Redirection

The requested resource resides temporarily under a different URL. Method and body must not be changed.

308

Permanent Redirect

Redirection

The requested resource has been permanently moved to another URL. Method and body must not be changed.

400

Bad Request

Client Error

The server cannot or will not process the request due to an apparent client error.

401

Unauthorized

Client Error

Authentication is required and has failed or has not yet been provided.

403

Forbidden

Client Error

The server understood the request but refuses to authorize it.

404

Not Found

Client Error

The requested resource could not be found on the server.

405

Method Not Allowed

Client Error

The method specified in the request is not allowed for the resource identified by the request URI.

408

Request Timeout

Client Error

The server timed out waiting for the request.

409

Conflict

Client Error

The request could not be processed because of conflict in the request.

410

Gone

Client Error

The requested resource is no longer available and will not be available again.

413

Payload Too Large

Client Error

The request is larger than the server is willing or able to process.

418

I'm a teapot

Client Error

This code was defined in 1998 as one of the traditional IETF April Fools' jokes, in RFC 2324, Hyper Text Coffee Pot Control Protocol.

422

Unprocessable Entity

Client Error

The request was well-formed but was unable to be followed due to semantic errors.

429

Too Many Requests

Client Error

The user has sent too many requests in a given amount of time.

500

Internal Server Error

Server Error

A generic error message, given when an unexpected condition was encountered and no more specific message is suitable.

501

Not Implemented

Server Error

The server either does not recognize the request method, or it lacks the ability to fulfill the request.

502

Bad Gateway

Server Error

The server was acting as a gateway or proxy and received an invalid response from the upstream server.

503

Service Unavailable

Server Error

The server is currently unavailable (because it is overloaded or down for maintenance).

504

Gateway Timeout

Server Error

The server was acting as a gateway or proxy and did not receive a timely response from the upstream server.

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Quick reference for HTTP status codes HTTP Status Code Reference runs in the browser on DevTools. There is no signup, and your input stays on this device unless the tool explicitly performs a live network lookup.

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HTTP Status Code Reference is a free in-browser utility, not a hosted API. It does not keep server-side history and is not a substitute for production verification in your own stack.

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HTTP Status Code Reference

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Status Code Reference30 codes

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Status Code Reference
30 codes