Look up HTTP status codes and meanings fast to troubleshoot API responses and integration issues.
Last updated: February 23, 2026
Search by code, name, or behavior to quickly map API responses to likely causes.
| Code | Name | Summary |
|---|---|---|
| 100 | Continue | Initial part of request received; client should continue. |
| 101 | Switching Protocols | Server is switching protocols as requested. |
| 102 | Processing | Server has accepted and is processing the request. |
| 103 | Early Hints | Server sends preliminary headers before final response. |
| Code | Name | Summary |
|---|---|---|
| 200 | OK | Request succeeded. |
| 201 | Created | Request succeeded and a resource was created. |
| 202 | Accepted | Request accepted for processing, not completed yet. |
| 203 | Non-Authoritative Information | Returned metadata may come from another source. |
| 204 | No Content | Request succeeded with no response body. |
| 205 | Reset Content | Client should reset the view. |
| 206 | Partial Content | Server is returning part of the resource. |
| 207 | Multi-Status | Conveys information for multiple resources. |
| 208 | Already Reported | Members of DAV binding already reported. |
| 226 | IM Used | Server fulfilled request using instance manipulations. |
| Code | Name | Summary |
|---|---|---|
| 300 | Multiple Choices | Request has multiple possible responses. |
| 301 | Moved Permanently | Resource has permanently moved to a new URL. |
| 302 | Found | Resource is temporarily located at a different URL. |
| 303 | See Other | Client should fetch resource with GET at another URI. |
| 304 | Not Modified | Cached version is still valid. |
| 305 | Use Proxy | Requested resource must be accessed through proxy. |
| 307 | Temporary Redirect | Temporary redirect with same method semantics. |
| 308 | Permanent Redirect | Permanent redirect with same method semantics. |
| Code | Name | Summary |
|---|---|---|
| 400 | Bad Request | Server could not understand malformed request. |
| 401 | Unauthorized | Authentication is required or failed. |
| 402 | Payment Required | Reserved for future use. |
| 403 | Forbidden | Server understands request but refuses to authorize. |
| 404 | Not Found | Requested resource could not be found. |
| 405 | Method Not Allowed | HTTP method is not allowed for this resource. |
| 406 | Not Acceptable | No representation matches acceptable criteria. |
| 407 | Proxy Authentication Required | Proxy requires authentication. |
| 408 | Request Timeout | Server timed out waiting for request. |
| 409 | Conflict | Request conflicts with current resource state. |
| 410 | Gone | Resource no longer exists and will not return. |
| 411 | Length Required | Server requires Content-Length header. |
| 412 | Precondition Failed | One or more request preconditions failed. |
| 413 | Payload Too Large | Request entity is larger than server is willing to process. |
| 414 | URI Too Long | Request URI is longer than server can interpret. |
| 415 | Unsupported Media Type | Payload format is not supported. |
| 416 | Range Not Satisfiable | Requested byte range cannot be fulfilled. |
| 417 | Expectation Failed | Server cannot meet Expect header requirements. |
| 418 | I'm a Teapot | RFC joke code indicating refusal to brew coffee. |
| 421 | Misdirected Request | Request was directed at a server unable to respond. |
| 422 | Unprocessable Entity | Request understood but semantic validation failed. |
| 423 | Locked | Resource is locked. |
| 424 | Failed Dependency | Request failed due to previous request failure. |
| 425 | Too Early | Server unwilling to process replay-prone request. |
| 426 | Upgrade Required | Client should switch to a different protocol. |
| 428 | Precondition Required | Server requires conditional request. |
| 429 | Too Many Requests | Rate limit exceeded. |
| 431 | Request Header Fields Too Large | Header fields are too large. |
| 451 | Unavailable For Legal Reasons | Resource blocked for legal reasons. |
| Code | Name | Summary |
|---|---|---|
| 500 | Internal Server Error | Server encountered an unexpected condition. |
| 501 | Not Implemented | Server does not support requested functionality. |
| 502 | Bad Gateway | Gateway/proxy got invalid response from upstream. |
| 503 | Service Unavailable | Server is unavailable or overloaded. |
| 504 | Gateway Timeout | Gateway/proxy timed out waiting for upstream. |
| 505 | HTTP Version Not Supported | HTTP version is not supported. |
| 506 | Variant Also Negotiates | Configuration issue in transparent content negotiation. |
| 507 | Insufficient Storage | Server cannot store representation needed to complete request. |
| 508 | Loop Detected | Server detected an infinite loop while processing request. |
| 510 | Not Extended | Further extensions required for request fulfillment. |
| 511 | Network Authentication Required | Client must authenticate to gain network access. |
Look up HTTP status codes and meanings fast to troubleshoot API responses and integration issues. This tool runs in-browser for fast results without account setup.
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