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WININET_E_DECODING_FAILED
WININET_E_DECODING_FAILED means that WinINet could not decode the received content according to its declared content encoding. It indicates a mismatch between the response metadata and the body bytes, or a decoding capability or corruption problem in the path.
Useful evidence
- The response
Content-Encodingand any transfer-encoding headers. - The first response bytes, captured only when it is safe to do so.
- Whether the response passed through a proxy, cache, antivirus product, or other transforming intermediary.
What not to assume
Do not immediately blame the origin server. A proxy can alter headers or body data independently. Compare a direct request and the configured WinINet path, then correct the component that is sending inconsistent headers and payload.
Microsoft: WinINet error messages · Microsoft: InternetReadFile
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