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WEB_E_UNEXPECTED_CONTENT
WEB_E_UNEXPECTED_CONTENT (0x83750005) identifies content appears where the contract allows none or expects something else. The parser has valid input but encounters an element, text node, array member, or ordering transition that the consuming contract does not accept. Record network reachability, HTTP status, and parser acceptance as separate layers.
Inspect the parser state
| State | Record |
|---|---|
| Current container | Which object, array, or element was open? |
| Expected token set | What names or token classes were legal next? |
| Actual token | Preserve namespace, scalar type, and position rather than only rendered text. |
Likely causes
- Producer and consumer use different contract revisions.
- Extension content is sent to a strict reader that has no skip policy.
- Members arrive in an order required by a streaming parser even though a tree model would tolerate reordering.
Isolation
- Remove only the unexpected node and replay
- Add the node to a known extension point if the protocol defines one
- Compare strict and forward-compatible readers without changing production policy
Avoid data loss
Blindly discarding unknown content can remove security, version, or routing information. The correction should follow the extension rules of the actual format.
Mixed content and order
Record whether the contract permits character data between child elements and whether child order is significant. A parser can accept the XML as well-formed while the projection layer rejects a valid-looking extra element, text node, or repeated member at that exact position.
Incident record
| Record | Purpose |
|---|---|
| First failing operation | API name, object state, and exact return point |
| Original representation | Unmodified bytes or a stable hash captured before repair or normalization |
| Contract identity | Schema, protocol, database, or persistence version with feature flags |
| Negative control | One intentionally invalid case that must remain rejected |
Repeatability versus recovery
A retry that drops this result may reflect changed process state, cache contents, timing, or input; repeat the same test in a fresh process and after the correction to distinguish repair from a transient path change.
Representation pipeline
| Stage | Evidence to retain |
|---|---|
| Producer model | Serializer, contract revision, omission, ordering, escaping, and numeric options |
| Transport bytes | Content type, charset, content encoding, declared length, and parser-visible bytes |
| Parser state | Offset, line or token path, expected construct, and actual construct |
| Projection layer | Schema, object mapper, or lookup converting XML or JSON into fields |
Normalization risks
Pretty-printing, reserialization, charset conversion, or browser copying can erase the condition producing this result; hash the original body, apply deterministic redaction, and retain both received and decompressed forms when content encoding is involved.
Focused regression corpus
- A minimal document containing no unrelated members
- A valid document at the nearest relevant boundary
- A contract-version variant showing strict or forward-compatible behavior
- A transport variant proving framing and character decoding are not hidden causes
Fix ownership
| Layer | When it owns the correction |
|---|---|
| Transport | Change framing, decompression, or character decoding only when captured bytes prove this layer altered the representation |
| Parser | Change syntax handling only when the raw token or markup violates the selected format |
| Projection | Change requiredness, path, ordering, or value conversion only after parsing succeeds |
| Producer | Correct serialization when the emitted representation contradicts the published contract |
Technical references
- Microsoft Open Specifications: HRESULT values
- Windows Web Services overview
- W3C XML 1.0 specification
- RFC 8259: The JavaScript Object Notation data interchange format
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