错误码
框架应答请求时使用的每个代码，即 application/problem+json 正文与命令结果中的 code，由 FrameworkErrors 生成；说明取自源码，为英文。领域拒绝的代码由领域自己定义，以 422 应答，除非宿主为它配置了别的状态（wow.http.errors.[<code>].status）。请求带 If-Match 时，wow.aggregate.version-mismatch 以 412 应答。
框架错误码
| 代码 | 状态 | 含义 |
|---|---|---|
wow.auth.unauthenticated | 401 | The request carries no valid credentials. |
wow.auth.forbidden | 403 | The caller may not send this command. |
wow.aggregate.forbidden | 403 | The aggregate is outside the caller's scope. |
wow.command.malformed | 400 | The command body cannot be read as the command type. |
wow.command.invalid | 400 | The command failed validation; the problem lists the violations. |
wow.wait.invalid | 400 | The wait is not a chain the runtime can follow; the command was not run. |
wow.command.unhandled | 400 | The aggregate does not handle this command. |
wow.aggregate.not-found | 404 | The aggregate does not exist. |
wow.aggregate.exists | 409 | The aggregate already exists. |
wow.aggregate.version-mismatch | 409 | The aggregate is not at the expected version (412 when the request carried If-Match). |
wow.command.request-id-reused | 409 | The request id was used by another command. |
wow.command.contended | 409 | Concurrent writers kept winning the version; retrying with the same request id is safe. |
wow.aggregate.deleted | 410 | The aggregate is deleted; only RestoreAggregate applies. |
wow.command.busy | 429 | The command was not taken: its aggregate has too many commands waiting, or the node too many in flight; retry later. |
wow.command.unknown | 503 | Whether the command committed is unknown; retrying with the same request id is safe. |
wow.command.failed | 500 | The command's handling failed with an unexpected error; it committed nothing, and a retry fails alike. |
wow.node.closing | 503 | The node is shutting down; retry on another node. |
wow.node.standby | 503 | The node is on standby until the cut-over: it serves reads only. |
wow.storage.unavailable | 503 | A store could not be reached or did not answer in time; retry later, a command with the same request id. |
wow.schedule.not-due | 503 | A scheduled command arrived too long before its due time on this node's clock; it is sent again later. |
wow.schedule.job-invalid | 400 | The job command does not fit its job or instance: an unknown job, another scope, or an instance not enabled. |
wow.subscription.parked | 500 | A subscription on the wait chain parked the aggregate; the wait cannot be reached until it resumes. |
wow.wait.timeout | 504 | The wait ran out of time; the command may have committed. The problem carries the last stage reached. |
wow.query.malformed | 400 | The query body cannot be read as a query. |
wow.query.invalid | 400 | The query failed admission; the problem lists the violations, each with its code (UNKNOWN_FIELD, ...). |
wow.query.failed | 500 | The query backend failed to run the query. |
wow.query.not-found | 404 | A single query matched no record: a query result, not a statement that an aggregate does not exist. |
wow.query.dataset-not-found | 404 | No dataset of that name is served to the caller. |
wow.query.timeout | 504 | The query ran longer than its budget allows; narrow it rather than run it again (decision D254 ③). |
wow.query.min-version-not-reached | 409 | The state read asked for a version the aggregate has not reached within the wait; the problem carries its current version: retry later. |
wow.query.busy | 429 | The query was not run: its store has as many queries running as it allows; retry later. |
wow.query.dataset-unavailable | 409 | The dataset is served but cannot be queried now, for the reason the problem names (it needs revision). |
wow.call.command-forbidden | 403 | The calling service may not call this command: its wow.http.services.<service>.commands do not list it. |
查询请求的代码
被拒绝的查询请求（wow.query.malformed 或 wow.query.invalid）会列出它拒绝的每一处，各带下列一个代码与它所指的请求部分，由 QueryErrorCodes 生成。代码只增不改，也不复用。
| 代码 | 分组 |
|---|---|
INVALID_JSON | Reading and decoding the request body. |
BODY_NOT_OBJECT | Reading and decoding the request body. |
EMPTY_BODY | Reading and decoding the request body. |
UNKNOWN_PROPERTY | Reading and decoding the request body. |
UNKNOWN_TYPE | Reading and decoding the request body. |
UNKNOWN_VALUE | Reading and decoding the request body. |
INVALID_VALUE | Reading and decoding the request body. |
INVALID_REQUEST | Reading and decoding the request body. |
CURSOR_SORT_DUPLICATE | Reading and decoding the request body. |
CURSOR_SORT_TOO_MANY | Reading and decoding the request body. |
INVALID_CURSOR | Reading and decoding the request body. |
SIZE_OUT_OF_RANGE | The entry budget and gates (errorCode IllegalArgument). |
FILTER_TOO_LARGE | The entry budget and gates (errorCode IllegalArgument). |
EXPENSIVE_OPERATOR_DISABLED | The entry budget and gates (errorCode IllegalArgument). |
COUNT_REQUIRES_FILTER | The entry budget and gates (errorCode IllegalArgument). |
RESIDUAL_GROUPS_EXCEEDED | The entry budget and gates (errorCode IllegalArgument). |
EXPLICIT_ENTRY_REQUIRED | The entry budget and gates (errorCode IllegalArgument). |
REPLAY_TOO_LONG | A state point read (GET …/{id}/state?version=|at=, …/state/trace). |
UNKNOWN_FIELD | Admission against the query model. |
UNSUPPORTED_CAPABILITY | Admission against the query model. |
ELEMENT_SCOPE_REQUIRED | Admission against the query model. |
VALUE_MISMATCH | Admission against the query model. |
NOT_COLLECTION | Admission against the query model. |
NOT_SINGLE_STRING | Admission against the query model. |
MODEL_SEARCH_UNSUPPORTED | Admission against the query model. |
CURSOR_NOT_ALLOWED | Admission against the query model. |
PROTECTED_AGGREGATION | Admission against the query model. |
PROTECTED_COMPARISON | Admission against the query model. |
MISSING_KEY_REQUIRES_STRING | Admission against the query model. |
ANY_REQUIRES_SINGLE_VALUE | Admission against the query model. |
INCOMPLETE_PROJECTION | Admission against the query model. |
METRIC_FILTER_SEARCH | Admission against the query model. |
METRIC_FILTER_ELEMENT_MATCH | Admission against the query model. |
METRIC_FILTER_ARRAY_FIELD | Admission against the query model. |
NOT_PROJECTABLE | Admission against the query model. |
EVENT_PROJECTION_TYPE_REQUIRED | Admission against the query model. |
TEMPORAL_REPRESENTATION_REQUIRED | Admission against the query model. |
TEMPORAL_CONFIGURATION_CONFLICT | Admission against the query model. |
PARALLEL_ARRAY_SORT | Admission against the query model. |
ARRAY_EQUALITY | Admission against the query model. |
FIRST_LAST_REQUIRES_SINGLE_VALUE | Admission against the query model. |
FIRST_LAST_REQUIRES_ORDER_BY | Admission against the query model. |
TEMPORAL_AGGREGATION_UNSUPPORTED | Admission against the query model. |
SORT_TOO_MANY | Admission against the query model. |
SORT_FIELD_DUPLICATE | Admission against the query model. |
IDENTITY_UNDEFINED | Admission against the query model. |
STORAGE_UNSUPPORTED | Admission against the query model. |
PREVIOUS_UNSHIFTABLE | Admission against the query model. |