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+# Errors
+
+Error handling is an important part of designing simple and intuitive APIs.
+Consistent error handling allows developers to know how to expect to receive
+errors, and to reduce boilerplate by having common error-handling logic, rather
+than being expected to constantly add verbose error handling everywhere.
+
+## Guidance
+
+Services **must** clearly distinguish successful responses from error responses
+by using appropriate HTTP codes:
+- Informational responses issued on a provisional basis while request processing continues **must** use HTTP status codes between 100 and 199.
+- Successful responses **must** use HTTP status codes between 200 and 299.
+- HTTP status codes between 300 and 399 **must** be used to indicate further action like URL redirection needs to be taken in order to complete the request.
+- Errors indicating a problem with the user's request **must** use HTTP status
+  codes between 400 and 499.
+- Errors indicating a problem with the server's handling of an valid request
+  **must** use HTTP status codes between 500 and 599.
+
+### Structure
+
+Error responses **should** conform to the following interface:
+
+```typescript
+interface Error {
+  // A machine-readable code indicating the type of error (like `name_too_long`). This value is parseable for programmatic error handling.
+  type: string;
+
+  // A human-readable description of the problem. Messages are likely to be logged in plain text and should not include information about a specific occurrence. Information about specific occurrences should be part of `metadata`.
+  message?: string
+
+  // The HTTP status code between 100 and 500
+  status?: integer
+
+  // A unique identifier that identifies the specific occurrence of the problem. Can be provided to the API owner for debugging purposes.
+  incidentId?: string
+
+  // A map of metadata returning additional error details that can be used programmatically. The schema of metadata should be documented and fixed per `type`. Schema of `metadata` is part of your API. Within a single version, breaking changes to `metadata` structure should not be performed; consider limiting depth of nested objects.
+  metadata?: dict<string, any>
+}
+```
+
+- The `message` field is intended for consumption by humans, and therefore 
+  **may** change, even within a single version.
+- The `type` field is intended to support comparison as an opaque sequence of
+  code points, and therefore **must not** change (even by case folding or
+  other normalization, e.g. "invalid_auth" and "Invalid_Auth" are distinct).
+  Values for this field should be 0-63 characters, and use only lower-case or upper case
+  letters, numbers, and the `-` character.
+
+
+
+### Error Messages
+
+Error messages **should** help a reasonably technical user understand and
+resolve the issue, and **should not** assume that the user is an expert in the
+particular API. Additionally, error messages **must not** assume that the user
+will know anything about its underlying implementation.
+
+Error messages **should** be brief but actionable. Any extra information
+**should** be provided in the `metadata` field. If even more information is
+necessary, the service **should** provide a link where a reader can get more
+information or ask questions to help resolve the issue.
+
+Below are some examples of good errors and not so good errors:
+
+    ❌  Invalid Book Name.
+    ✅  Book name must be between 5 and 50 characters.
+
+    ❌  Access is denied
+    ✅  Only admin users have access to this resource.
+
+
+### Example Error Responses
+
+Below are examples of how error response could look like:
+
+1. Book name is too long
+
+```
+{
+   "type": "book_name_too_long",
+   "message": "Book name must be between 5 and 50 characters",
+   "status": 400,
+   "incidentId": "ASAZasGFG2135qsfas2"
+}
+```
+
+2. Invalid input parameters
+
+```
+{
+  "type": "invalid_input_parameters",
+  "message": "Your request parameters aren't valid",
+  "status": 400,
+  "metadata": {
+    "invalid-params": [
+      {
+        "name": "age",
+        "reason": "must be a positive integer"
+      },
+      {
+        "name": "color",
+        "reason": "must be 'green', 'red' or 'blue'"
+      }
+    ]
+  }
+}
+```
+
+
+
+
+### Localization
+
+Error messages **must** be in American English. If a localized error message is
+also required, the service **should** provide the following structure within
+its `metadata`:
+
+```typescript
+interface LocalizedMessage {
+  // The locale for this error message.
+  // Follows the spec defined at http://www.rfc-editor.org/rfc/bcp/bcp47.txt.
+  // Examples: 'en-US', 'de-CH', 'es-MX'
+  locale: string;
+
+  // The localized error message in the above locale.
+  message: string;
+}
+```
+
+### Partial errors
+
+APIs **should not** support partial errors. Partial errors add significant
+complexity for users, because they usually sidestep the use of error codes, or
+move those error codes into the response message, where the user must write
+specialized error handling logic to address the problem.
+
+However, occasionally partial errors are unavoidable, particularly in bulk
+operations where it would be hostile to users to fail an entire large request
+because of a problem with a single entry.
+
+Methods that require partial errors **should** use long-running operations (as
+described in AIP-151), and the method **should** put partial failure
+information in the metadata message. The errors themselves **must** still be
+represented with an error object.
+
+## Further reading
+
+- For which error codes to retry, see AIP-194.
+
+## Changelog
+- **2022-01-24**: Adopting RFC 7807 with tweaks for the errors AIP.
+- **2020-09-02**: Refactored errors AIP to be more generic.
+- **2020-01-22**: Added a reference to the `ErrorInfo` message in gRPC.
+- **2019-10-14**: Added guidance restricting error message mutability to if
+  there is a machine-readable identifier present.
+- **2019-09-23**: Added guidance about error message strings being able to
+  change.
diff --git a/aip/general/0193/aip.yaml b/aip/general/0193/aip.yaml
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+---
+id: 193
+state: approved
+created: 2019-07-26
+placement:
+  category: polish
+  order: 30