HTTP 5xx Server Error Status Codes

HTTP Status Codes•Permalink

Server error responses like 500, 502, 503, and 504.

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## Codes 500-510

HTTP 500 Internal Server Error

↗#

curl -i https://example.com/broken

# Generic unexpected server failure

HTTP 501 Not Implemented

↗#

curl -i -X PATCH https://example.com/legacy-endpoint

# Method or capability not implemented

HTTP 502 Bad Gateway

↗#

curl -i https://example.com/api

# Upstream sent invalid response

HTTP 503 Service Unavailable

↗#

curl -i https://example.com

# Temporarily unavailable or overloaded

HTTP 504 Gateway Timeout

↗#

curl -i https://example.com/reports

# Upstream did not respond in time

HTTP 505 HTTP Version Not Supported

↗#

curl --http0.9 -i https://example.com

# HTTP version unsupported

HTTP 506 Variant Also Negotiates

↗#

HTTP/1.1 506 Variant Also Negotiates

# Negotiation config loop

HTTP 507 Insufficient Storage

↗#

PUT /webdav/bigfile HTTP/1.1

# Server lacks storage to complete request

HTTP 508 Loop Detected

↗#

PROPFIND /webdav/loop HTTP/1.1

# Infinite loop detected while processing

HTTP 510 Not Extended

↗#

HTTP/1.1 510 Not Extended

# Further request extensions required

## Codes 511-511

HTTP 511 Network Authentication Required

↗#

HTTP/1.1 511 Network Authentication Required

# Network access authentication required

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