You are browsing documentation for an outdated plugin version.
Looking for the plugin's configuration parameters? You can find them in the OAS Validation configuration reference doc.
Validate HTTP requests and responses against an OpenAPI Specification.
The plugin supports both Swagger (v2) and OpenAPI (3.0.x and 3.1.0) specifications with a JSON Schema validator that supports Draft 2019-09.
In Kong Gateway versions 3.1.0.0-3.1.1.1, this plugin is not enabled by default. Upgrade to 3.1.1.2, or manually enable the plugin.
Supported OpenAPI 3.1.0 specification features
Category | Supported | Not supported |
---|---|---|
Request Body | application/json |
application/xml multipart/form-data text/plain text/xml |
Response Body | application/json |
- |
Request Parameters |
path , query , header , cookie
|
- |
Schema |
allOf oneOf anyOf |
- |
Parameter Serialization |
style , explode
|
- |
Tutorial
This example tutorial steps you through ensuring an API request conforms to the associated API specification. This example uses the sample Petstore spec.
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Create a service called
Petstore-Service
:curl -X POST http://localhost:8001/services/ \ --data name='Petstore-Service' \ --data url='https://petstore.swagger.io/v2'
-
Create a wildcard route called
Petstore-Route
:curl -X POST http://localhost:8001/services/Petstore-Service/routes \ --data name='Petstore-Route' \ --data paths='/.*'
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Enable the Validation plugin on the service you configured:
curl -X POST http://localhost:8001/services/Petstore-Service/plugins \ --data name='oas-validation' \ --data config.api_spec='<copy contents of https://petstore.swagger.io/v2/swagger.json here>' \ --data config.verbose_response=true
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Test the Validation plugin. The request resource expects a status query parameter, which is missing from the following request:
curl -X GET "http://localhost:8000/pet/findByStatus" \ -H "accept: application/json"
The response includes a verbose error response, since we have enabled this option in the plugin configuration:
HTTP/1.1 400 Bad Request Content-Length: 106 Content-Type: application/json; charset=utf-8 Date: Tue, 03 May 2022 20:45:00 GMT Server: kong/2.8.0.0-internal-preview-enterprise-edition X-Kong-Response-Latency: 2 { "message": "query 'status' validation failed with error: 'required parameter value not found in request'" }
Event hooks
Event hooks are outbound calls from Kong Gateway. With event hooks, Kong Gateway can communicate with target services or resources, letting the target know that an event was triggered. Refer to the event hooks example documentation for more information on event hooks.
For the Validation plugin, event hook events can be enabled when a Validation fails for all request parameters, that is URI, Header, & Query parameters and Request body, and/or for Response body from the Upstream Service.
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Add an event hook for the Validation plugin:
curl -i -X POST http://{HOSTNAME}:8001/event-hooks \ -d source=oas-validation \ -d event=validation-failed \ -d handler=webhook \ -d config.url={WEBHOOK_URL}
Response:
HTTP/1.1 201 Created .. { "config": { "headers": {}, "url": {WEBHOOK_URL}, "ssl_verify": false, "secret": null }, "id": "3fe43989-6cf1-4936-bd5d-b7774ca52ad8", "source": "oas-validation", "event": "validation-failed", "handler": "webhook", "snooze": null, "on_change": null, "created_at": 1649732398 }
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Force a validation failure to a service or route to which the Validation plugin is applied. The Webhook URL will receive a response with JSON payload.
The following is an example JSON response which includes the forwarded IP address, service, consumer, and error message:
{ "ip": "10.0.2.2", "source": "oas-validation", "err": "query 'status' validation failed with error: 'required parameter value not found in request'", "event": "validation-failed", "service": { "ws_id": "7eebecc0-064e-4890-99cf-0c816280a68e", "enabled": true, "retries": 5, "read_timeout": 60000, "protocol": "https", "id": "6792ec72-67b2-4960-96b1-e7564dda3178", "connect_timeout": 60000, "name": "petstore-service", "port": 443, "host": "petstore.swagger.io", "updated_at": 1649391578, "path": "/v2/", "write_timeout": 60000, "created_at": 1647993371 }, "consumer": {} }
Troubleshooting
The plugin validates the ETag header with the If-Match header
If a request contains the If-Match
request header, the OAS Validation plugin follows RFC 2616 to validate the Etag
response header.
If you don’t want the plugin to validate the Etag
with the If-Match
request header,
send the If-Match
header with a wildcard (*
) to skip validation.
For example:
curl http://localhost:8000/example-route \
-H 'If-Match:*'