HRESULT 0x80190005 (HTTP_E_STATUS_UNEXPECTED_SERVER

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Description:

The HTTP client received an unexpected 5xx server-error response.

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HTTP_E_STATUS_UNEXPECTED_CLIENT_ERROR	HTTP_E_STATUS_AMBIGUOUS

HTTP_E_STATUS_UNEXPECTED_SERVER_ERROR

HTTP_E_STATUS_UNEXPECTED_SERVER_ERROR means the request reached a server or gateway, but the processing path failed with a 5xx response. The error can be generated by the origin application, a reverse proxy, a load balancer, or an upstream dependency.

What to check

Correlate the client timestamp and any request ID with server, proxy, and upstream logs.
Distinguish a temporary overload response such as 503 from an upstream timeout such as 504 and a generic application failure such as 500.
Use bounded retries only for operations that can safely be repeated.

RFC 9110: Server error status codes

RFC 9112: HTTP/1.1 message syntax and parsing

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