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status-code-decision-matrix

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更新日2026年5月20日 20:18

Choose HTTP status codes and response payload behavior for ASP.NET Core minimal APIs. Use for success and error branch semantics, problem details, conflicts, and compatibility exceptions.

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Status Code Decision Matrix

When to Use

Endpoint behavior design or review in src/backend
Inconsistent status code handling across endpoints
PR review focused on HTTP semantics

Quick Checklist

Classify operation type and expected outcomes.
Assign canonical success status.
Assign specific 4xx/5xx statuses per failure cause.
Document and justify compatibility exceptions.

Deep Workflow

Classify operation type: read, create, replace, partial update, delete, command/action.
Enumerate all outcomes: success, validation failure, authz/authn failure, not found, conflict, transient dependency failure.
Select success status:
- Read single/list: 200
- Create: 201 with location when resource URI is available
- Delete with no body: 204
- Command accepted async: 202
Select client-error status:
- Validation/input errors: 400 with problem details
- Authn/authz: 401/403
- Missing resource: 404
- State/version conflict: 409
Select server/dependency status when applicable (500/503) and ensure no sensitive details leak.
Verify endpoint metadata and tests assert status + payload shape.

Decision Rules

Prefer specific 4xx statuses over generic 400 when cause is known.
Use 404 for unknown identifiers, not for authorization failures.
Use 409 when request is valid but current resource state prevents execution.
When existing clients depend on non-canonical behavior, keep compatibility and annotate a migration plan.

Completion Checks

Every expected branch maps to one status code.
Success paths and failure paths are both testable and documented.
Status behavior is consistent with existing endpoint patterns.

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name	status-code-decision-matrix
description	Choose HTTP status codes and response payload behavior for ASP.NET Core minimal APIs. Use for success and error branch semantics, problem details, conflicts, and compatibility exceptions.
argument-hint	Describe the operation type, expected success result, known failure modes, and any client-compatibility constraints.

Status Code Decision Matrix

When to Use

Endpoint behavior design or review in src/backend
Inconsistent status code handling across endpoints
PR review focused on HTTP semantics

Quick Checklist

Classify operation type and expected outcomes.
Assign canonical success status.
Assign specific 4xx/5xx statuses per failure cause.
Document and justify compatibility exceptions.

Deep Workflow

Classify operation type: read, create, replace, partial update, delete, command/action.
Enumerate all outcomes: success, validation failure, authz/authn failure, not found, conflict, transient dependency failure.
Select success status:
- Read single/list: 200
- Create: 201 with location when resource URI is available
- Delete with no body: 204
- Command accepted async: 202
Select client-error status:
- Validation/input errors: 400 with problem details
- Authn/authz: 401/403
- Missing resource: 404
- State/version conflict: 409
Select server/dependency status when applicable (500/503) and ensure no sensitive details leak.
Verify endpoint metadata and tests assert status + payload shape.

Decision Rules

Prefer specific 4xx statuses over generic 400 when cause is known.
Use 404 for unknown identifiers, not for authorization failures.
Use 409 when request is valid but current resource state prevents execution.
When existing clients depend on non-canonical behavior, keep compatibility and annotate a migration plan.

Completion Checks

Every expected branch maps to one status code.
Success paths and failure paths are both testable and documented.
Status behavior is consistent with existing endpoint patterns.