What does HRESULT 0x80190131 (HTTP_E_STATUS_USE_PROXY) mean?

 
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HTTP_E_STATUS_USE_PROXY

HTTP_E_STATUS_USE_PROXY maps to HTTP 305 Use Proxy. RFC 9110 deprecates this status code because of security concerns; modern servers should not generate it and modern clients should not rely on it to configure proxy routing.

What to do

  • Inspect the response source and determine whether an obsolete proxy, gateway, or test service generated the status.
  • Configure proxies through the operating system, browser, client library, or managed policy instead of trusting a 305 response.
  • Check for interception or legacy infrastructure that may be rewriting responses.

RFC 9110: 305 Use Proxy (deprecated)


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