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Free Online HTTP Status Codes Reference

#http#status#api

Free online interactive guide and search tool for all HTTP response status codes with detailed descriptions.

100

1xx

Continue

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

MDN Documentation

101

1xx

Switching Protocols

The requester has asked the server to switch protocols.

MDN Documentation

102

1xx

Processing

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

MDN Documentation

200

2xx

OK

Standard response for successful HTTP requests.

MDN Documentation

201

2xx

Created

The request has been fulfilled, resulting in the creation of a new resource.

MDN Documentation

202

2xx

Accepted

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

MDN Documentation

204

2xx

No Content

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

MDN Documentation

206

2xx

Partial Content

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

MDN Documentation

300

3xx

Multiple Choices

Indicates multiple options for the resource from which the client may choose.

MDN Documentation

301

3xx

Moved Permanently

This and all future requests should be directed to the given URI.

MDN Documentation

302

3xx

Found

Tells the client to look at (browse to) another URL.

MDN Documentation

304

3xx

Not Modified

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

MDN Documentation

307

3xx

Temporary Redirect

In this case, the request should be repeated with another URI.

MDN Documentation

308

3xx

Permanent Redirect

The request and all future requests should be repeated using another URI.

MDN Documentation

400

4xx

Bad Request

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

MDN Documentation

401

4xx

Unauthorized

Similar to 403 Forbidden, but specifically for use when authentication is required and has failed.

MDN Documentation

403

4xx

Forbidden

The request contained valid data and was understood by the server, but the server is refusing action.

MDN Documentation

404

4xx

Not Found

The requested resource could not be found but may be available in the future.

MDN Documentation

405

4xx

Method Not Allowed

A request method is not supported for the requested resource.

MDN Documentation

408

4xx

Request Timeout

The server timed out waiting for the request.

MDN Documentation

409

4xx

Conflict

Indicates that the request could not be processed because of conflict in the current state of the resource.

MDN Documentation

410

4xx

Gone

Indicates that the resource requested is no longer available and will not be available again.

MDN Documentation

422

4xx

Unprocessable Entity

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

MDN Documentation

429

4xx

Too Many Requests

The user has sent too many requests in a given amount of time ('rate limiting').

MDN Documentation

500

5xx

Internal Server Error

A generic error message, given when an unexpected condition was encountered.

MDN Documentation

501

5xx

Not Implemented

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

MDN Documentation

502

5xx

Bad Gateway

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

MDN Documentation

503

5xx

Service Unavailable

The server cannot handle the request (because it is overloaded or down for maintenance).

MDN Documentation

504

5xx

Gateway Timeout

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

MDN Documentation

Developer Quick-Ref

Instant lookup for REST API status codes. All definitions follow the official IANA registry.

Semantic Meaning

Proper status code selection is crucial for SEO and reliable client-side error handling.

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How to use it

Search Code

Enter a specific code like '401' or a name like 'Unauthorized' in the search bar to find it instantly.

Filter by Group

Use the category buttons (2xx, 4xx, etc.) to browse related status codes and understand their common themes.

Review Details

Read the descriptive card for each code to understand its semantic meaning and when it should be used in your application.

FAQ

?What are the 5 categories of HTTP codes?

Codes are grouped into: 1xx (Informational), 2xx (Success), 3xx (Redirection), 4xx (Client Error), and 5xx (Server Error).

?Why is a 404 error bad for SEO?

A 404 error means a page wasn't found. Too many 404s can signal to search engines that your site is poorly maintained, potentially hurting your rankings.

?Is this reference up to date?

Yes, our guide includes all standard status codes currently registered by IANA and commonly used in modern web development and REST APIs.

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Quickly look up the meaning of any HTTP response status code with our interactive reference guide. From common 200 OK and 404 Not Found to obscure codes like 418 I'm a teapot, we provide detailed technical explanations for all standard IANA status codes. Essential for API development, debugging, and improving website SEO through proper status code implementation.

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