What's the difference between 401 and 403?

401 Unauthorized means you haven't provided valid credentials (login required). 403 Forbidden means you're authenticated but don't have permission for that specific resource.

What does a 429 status code mean?

429 Too Many Requests means you've hit a rate limit. Slow down your requests or implement exponential backoff in your client code.

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Free HTTP Status Code Reference — All HTTP Codes Explained

Quick reference for all HTTP response status codes with search.

HTTP Status Codes

Quick reference for HTTP response status codes.

100

Continue

Server received initial request, client should continue.

101

Switching Protocols

Server switching protocols as requested by client.

200

Request succeeded.

201

Created

New resource created.

204

No Content

Request succeeded, no content to return.

301

Moved Permanently

Resource moved to a new permanent URL.

302

Found

Resource temporarily at a different URL.

304

Not Modified

Resource not modified since last request.

307

Temporary Redirect

Temporary redirect, method must not change.

400

Bad Request

Server cannot process malformed request.

401

Unauthorized

Authentication required.

403

Forbidden

Client lacks permission to access this resource.

404

Not Found

Requested resource does not exist.

405

Method Not Allowed

HTTP method not allowed for this resource.

408

Request Timeout

Server timed out waiting for request.

409

Conflict

Request conflicts with current state.

410

Gone

Resource permanently deleted.

422

Unprocessable Entity

Semantic errors in the request.

429

Too Many Requests

Rate limit exceeded.

500

Internal Server Error

Server encountered an unexpected error.

502

Bad Gateway

Upstream server returned invalid response.

503

Service Unavailable

Server temporarily unavailable.

504

Gateway Timeout

Upstream server timed out.

About HTTP Status Codes

A searchable, categorized reference of all HTTP status codes — 1xx informational, 2xx success, 3xx redirection, 4xx client errors, and 5xx server errors. Each code shows its official description, common use cases, and whether it's standard or experimental. Bookmark this for debugging API responses, understanding error logs, or learning HTTP for web development interviews.

How to Use HTTP Status Codes

1Browse status codes by category: 1xx, 2xx, 3xx, 4xx, 5xx
2Search for a specific code or keyword
3Each code shows the official description, common use cases, and a plain-English explanation
4Bookmark frequently referenced codes for quick access

When to Use HTTP Status Codes

▸Quickly looking up HTTP status codes during API development
▸Understanding error responses from third-party services
▸Learning HTTP for technical interviews and certifications
▸Writing better error messages in web applications

Frequently Asked Questions

What's the difference between 401 and 403?: 401 Unauthorized means you haven't provided valid credentials (login required). 403 Forbidden means you're authenticated but don't have permission for that specific resource.
What does a 429 status code mean?: 429 Too Many Requests means you've hit a rate limit. Slow down your requests or implement exponential backoff in your client code.

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