HRESULT 0xC00D1328 (NS_E_CURL_INVALIDSCHEME): meaning and diagnosis

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Description:

The URL contains a scheme that is not valid.%0

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NS_E_CURL_INVALIDPATH	NS_E_CURL_INVALIDURL

NS_E_CURL_INVALIDSCHEME

`NS_E_CURL_INVALIDSCHEME`: evidence, boundary and retest

The useful reading of NS_E_CURL_INVALIDSCHEME (0xC00D1328) is not “media failed” but the scheme token is malformed or unsupported by the URL helper. This places the failure at the invalidscheme URL check and narrows the evidence to collect before another attempt changes state.

Before any socket is opened, the player decomposes a URL into scheme, authority, host, port, path and escaped data while tracing the invalidscheme path. It may also combine a relative reference with a base URL or convert a file URL into a path; each operation has a different validity rule during a controlled invalidscheme retest. In the case of NS_E_CURL_INVALIDSCHEME, preserve the earliest lower-level result because wrappers can map several different causes to the same HRESULT for evidence about invalidscheme.

Preserve the raw and parsed URL

Capture	Why it separates `NS_E_CURL_INVALIDSCHEME`
Owning call	Record the API method, object identity, thread or callback and timestamp for the invalidscheme URL check.
Decisive values	the original unmodified string, character count, encoding, base URL if any, parsed scheme, host, port and path, plus required and supplied output-buffer lengths in the invalidscheme diagnostic record.
Object generation	Note when the reader, writer, graph, URL object, streaming session or metadata provider was created; stale state can reproduce `NS_E_CURL_INVALIDSCHEME` after configuration has changed.
First nested result	Keep the earliest codec, COM, socket, DNS, parser or provider status before `NS_E_CURL_INVALIDSCHEME`; later UI messages are less specific.
Comparison case	Use one known-good resource that exercises the same the invalidscheme URL check while changing only the rejected precondition.

Failure anatomy

The invalidscheme url check is reached when the scheme token is malformed or unsupported by the URL helper. The caller must not assume that the next filter, packet, session or metadata state exists after NS_E_CURL_INVALIDSCHEME.

Use use a registered and supported scheme while keeping the authority and path unchanged as the negative control before closing the invalidscheme incident. A later HRESULT means this checkpoint was cleared and the new result belongs to a different stage in the invalidscheme diagnostic record.

Nearby results are not interchangeable

Main distinction: URL syntax errors occur before server DNS, proxy selection or streaming-session creation when isolating the invalidscheme case.

Nearby HRESULT	How to compare it
`NS_E_CURL_INVALIDHOSTNAME`	Compare the owning API and first rejected value; it belongs to a neighboring checkpoint, not automatically to the same cause as `NS_E_CURL_INVALIDSCHEME`.
`NS_E_CURL_INVALIDPATH`	Use object state and operation order to decide which code is authoritative when both appear in one trace while tracing the invalidscheme path.
`NS_E_CURL_INVALIDURL`	Retain this result separately if it appears only after the `NS_E_CURL_INVALIDSCHEME` condition has cleared.

One-component URL experiment

Log 0xC00D1328, NS_E_CURL_INVALIDSCHEME, the exact operation and the first failure time for evidence about invalidscheme.
Preserve the original unmodified string, character count, encoding, base URL if any, parsed scheme, host, port and path, plus required and supplied output-buffer lengths before closing the invalidscheme incident.
Do not reuse a graph, session, reader or metadata object created before the relevant configuration or resource changed in the invalidscheme diagnostic record.
Perform one isolated test: use a registered and supported scheme while keeping the authority and path unchanged when isolating the invalidscheme case.
Repeat through the same API and protocol path; a different player or local-copy test is useful only as a comparison, not as proof that the invalidscheme URL check is fixed.
Confirm the expected next state and retain any new HRESULT as a separate downstream result while tracing the invalidscheme path.

What the parser result proves

Retest result	Interpretation for `NS_E_CURL_INVALIDSCHEME`
The identical call still returns the code	The values governing the invalidscheme URL check are unchanged, or the caller is still using an older object generation.
A fresh object succeeds	Lifetime or cached state contributed to `NS_E_CURL_INVALIDSCHEME`; correct object recreation instead of applying a machine-wide workaround for evidence about invalidscheme.
The call advances to another HRESULT	The the invalidscheme URL check boundary was cleared. Diagnose the new code at its own format, graph, URL, network or metadata stage in the invalidscheme diagnostic record.
Only one resource fails	The evidence favors content, URL, publishing point, stream, attribute or object-specific state rather than a global outage when isolating the invalidscheme case.

Misleading actions

blindly decoding and re-encoding the whole URL, which can change reserved delimiters and resource identity at the invalidscheme checkpoint.
Do not erase the first NS_E_CURL_INVALIDSCHEME occurrence by repeatedly retrying; callbacks and reconnects can replace the useful state with a later wrapper error while tracing the invalidscheme path.
Do not publish credentials, protected-content material or complete private URLs during a controlled invalidscheme retest. Record redacted identifiers, lengths, hashes and protocol fields needed to reproduce the invalidscheme URL check.

Technical references

Treat NS_E_CURL_INVALIDSCHEME as resolved only when the same API path crosses this checkpoint; success through a different player or cached copy is merely supporting evidence before closing the invalidscheme incident.

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