HRESULT 0xC00D132F (NS_E_CURL_CANTDECODE): meaning and diagnosis

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The URL contains characters that cannot be decoded. The URL might be truncated or incomplete.%0

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NS_E_CURLHELPER_NOTAFILE	NS_E_CURLHELPER_NOTRELATIVE

NS_E_CURL_CANTDECODE

Investigating `NS_E_CURL_CANTDECODE` without losing the first failure

NS_E_CURL_CANTDECODE (0xC00D132F) marks percent-encoded or escaped URL data cannot be decoded as a complete valid sequence. The code belongs to the cantdecode URL check, which is why a later network, codec or metadata error must be recorded separately instead of replacing it.

Before any socket is opened, the player decomposes a URL into scheme, authority, host, port, path and escaped data when isolating the cantdecode case. 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 at the cantdecode checkpoint. In the case of NS_E_CURL_CANTDECODE, preserve the earliest lower-level result because wrappers can map several different causes to the same HRESULT while tracing the cantdecode path.

Where the failure occurs

At the cantdecode URL check, the component has already accepted the earlier prerequisites but cannot cross the boundary described as percent-encoded or escaped URL data cannot be decoded as a complete valid sequence. That distinction matters: success in opening the file, resolving the host or creating a COM object does not prove that this later operation is valid for evidence about cantdecode.

The strongest reproduction is preserve the raw URL and replace only the malformed percent-escape or illegal character with its RFC 3986 representation before closing the cantdecode incident. If the same call advances after that single change, the evidence supports the NS_E_CURL_CANTDECODE boundary. If it does not, return to the first nested error rather than widening the repair when isolating the cantdecode case.

What the parser result proves

Retest result	Interpretation for `NS_E_CURL_CANTDECODE`
The identical call still returns the code	The values governing the cantdecode 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_CANTDECODE`; correct object recreation instead of applying a machine-wide workaround while tracing the cantdecode path.
The call advances to another HRESULT	The the cantdecode URL check boundary was cleared. Diagnose the new code at its own format, graph, URL, network or metadata stage for evidence about cantdecode.
Only one resource fails	The evidence favors content, URL, publishing point, stream, attribute or object-specific state rather than a global outage before closing the cantdecode incident.

Preserve the raw and parsed URL

Capture	Why it separates `NS_E_CURL_CANTDECODE`
Owning call	Record the API method, object identity, thread or callback and timestamp for the cantdecode 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 when isolating the cantdecode case.
Object generation	Note when the reader, writer, graph, URL object, streaming session or metadata provider was created; stale state can reproduce `NS_E_CURL_CANTDECODE` after configuration has changed.
First nested result	Keep the earliest codec, COM, socket, DNS, parser or provider status before `NS_E_CURL_CANTDECODE`; later UI messages are less specific.
Comparison case	Use one known-good resource that exercises the same the cantdecode URL check while changing only the rejected precondition.

One-component URL experiment

Log 0xC00D132F, NS_E_CURL_CANTDECODE, the exact operation and the first failure time for evidence about cantdecode.
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 cantdecode incident.
Do not reuse a graph, session, reader or metadata object created before the relevant configuration or resource changed in the cantdecode diagnostic record.
Perform one isolated test: preserve the raw URL and replace only the malformed percent-escape or illegal character with its RFC 3986 representation when isolating the cantdecode 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 cantdecode URL check is fixed.
Confirm the expected next state and retain any new HRESULT as a separate downstream result while tracing the cantdecode path.

Nearby results are not interchangeable

Main distinction: decode failure concerns escaped octets; invalid-character failure can occur before percent decoding during a controlled cantdecode retest.

Nearby HRESULT	How to compare it
`NS_E_CURLHELPER_NOTADIRECTORY`	Compare the owning API and first rejected value; it belongs to a neighboring checkpoint, not automatically to the same cause as `NS_E_CURL_CANTDECODE`.
`NS_E_CURLHELPER_NOTAFILE`	Use object state and operation order to decide which code is authoritative when both appear in one trace before closing the cantdecode incident.
`NS_E_CURLHELPER_NOTRELATIVE`	Retain this result separately if it appears only after the `NS_E_CURL_CANTDECODE` condition has cleared.

Misleading actions

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

Technical references

Close the incident only after the original NS_E_CURL_CANTDECODE operation succeeds on a current object and the expected next state is observed for evidence about cantdecode.

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