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curl -i https://example.com/brokenNotes
Usually means the server failed while trying to fulfill a valid request.
HTTP 5xx Server Error Status Codes
Server error responses like 500, 502, 503, and 504.
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Codes 500-510
Reference entries for HTTP 500-510 responses.
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curl -i -X PATCH https://example.com/legacy-endpointNotes
Used when the server does not support the functionality required to fulfill the request.
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curl -i https://example.com/apiNotes
Common with reverse proxies when an upstream app returns malformed or unreachable responses.
HTTP 503 Service Unavailable
Temporarily unavailable or overloaded
textANYhttpstatus-code5xxhttp-503
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curl -i https://example.comNotes
Often used during maintenance windows or overload conditions.
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curl -i https://example.com/reportsNotes
Typical when a proxy or gateway timed out waiting for an upstream service.
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curl --http0.9 -i https://example.comNotes
The server refuses the request due to the HTTP version used.
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HTTP/1.1 506 Variant Also NegotiatesNotes
Indicates a server configuration error involving transparent content negotiation.
HTTP 507 Insufficient Storage
Server lacks storage to complete request
textANYhttpstatus-code5xxhttp-507
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PUT /webdav/bigfile HTTP/1.1Notes
Often associated with WebDAV or storage-limited operations.
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PROPFIND /webdav/loop HTTP/1.1Notes
Often seen in WebDAV processing graphs or recursive operations.
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HTTP/1.1 510 Not ExtendedNotes
The server requires further extensions to fulfill the request.
Codes 511-511
Reference entries for HTTP 511-511 responses.
More in HTTP Status Codes
HTTP Common Errors and Debugging
Common HTTP status code comparisons, cURL debugging recipes, and troubleshooting patterns.
HTTP 4xx Client Error Status Codes
Client error responses like 400, 401, 403, 404, 409, 422, and 429.
HTTP 3xx Redirect Status Codes
Redirection responses like 301, 302, 307, and 308.
HTTP 2xx Success Status Codes
Successful responses like 200 OK, 201 Created, and 204 No Content.
HTTP 1xx Informational Status Codes
Informational responses like 100 Continue and 103 Early Hints.
HTTP Status Codes Cheat Sheet
Comprehensive HTTP status code reference with meanings, examples, and debugging guidance.