Forward request

The forward-request policy forwards the incoming request to the backend service specified in the request context. The backend service URL is specified in the API settings and can be changed using the set backend service policy.

Removing this policy results in the request not being forwarded to the backend service. The policies in the outbound section are evaluated immediately upon the successful completion of the policies in the inbound section.

XMLCopy

<forward-request timeout="time in seconds" follow-redirects="true | false"/>

Limit concurrency

The limit-concurrency policy prevents enclosed policies from executing by more than the specified number of requests at any time. When requests exceed that number, new requests fail immediately with a 429 Too Many Requests status code.

XMLCopy

<limit-concurrency key="expression" max-count="number">
        <!— nested policy statements -->
</limit-concurrency>

Log to Event Hubs

The log-to-eventhub policy sends messages in the specified format to an event hub defined by a Logger entity. As its name implies, the policy is used for saving selected request or response context information for online or offline analysis.

XMLCopy

<log-to-eventhub logger-id="id of the logger entity" partition-id="index of the partition where messages are sent" partition-key="value used for partition assignment">
  Expression returning a string to be logged
</log-to-eventhub>

Mock response

The mock-response, as the name implies, is used to mock APIs and operations. It aborts normal pipeline execution and returns a mocked response to the caller. The policy always tries to return responses of highest fidelity. It prefers response content examples, whenever available. It generates sample responses from schemas, when schemas are provided and examples aren’t. If examples or schemas aren’t found, responses with no content are returned.

XMLCopy

<mock-response status-code="code" content-type="media type"/>

Retry

The retry policy executes its child policies once and then retries their execution until the retry condition becomes false or retry count is exhausted.

XMLCopy

<retry
    condition="boolean expression or literal"
    count="number of retry attempts"
    interval="retry interval in seconds"
    max-interval="maximum retry interval in seconds"
    delta="retry interval delta in seconds"
    first-fast-retry="boolean expression or literal">
        <!-- One or more child policies. No restrictions -->
</retry>