What does HRESULT 0x80190130 (HTTP_E_STATUS_NOT_MODIFIED) mean?

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The server returned HTTP 304 Not Modified for a conditional request.

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HTTP_E_STATUS_REDIRECT_METHOD	HTTP_E_STATUS_USE_PROXY

HTTP_E_STATUS_NOT_MODIFIED

HTTP_E_STATUS_NOT_MODIFIED maps to HTTP 304 Not Modified. It is normally a successful cache-validation result for a conditional GET or HEAD request: the client should reuse its stored representation rather than expect a new response body.

What to check

Verify that the request carried valid validators such as If-None-Match or If-Modified-Since.
Confirm that the client actually has the cached representation associated with the validators it sent.
Review cache headers and entity tags if the client receives 304 without a usable local copy.

RFC 9110: 304 Not Modified

RFC 9111: HTTP caching

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