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Throttling allows you to limit the number of hits to an API during a given period of time, typically in cases such as the following:

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Resource-level throttling is defined to HTTP verbs of an API's resources by the developer at the time an API is created using the Publisher. When a subscriber views an API using the API Store, s/he can see the resource-level throttling tiers using the Throttle Info tab as follows:

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The following throttling policy allows 1000 concurrent requests to a service.

Code Block

language	html/xml

<wsp:Policy xmlns:wsp="http://schemas.xmlsoap.org/ws/2004/09/policy"
xmlns:wsu="http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-utility-1.0.xsd"
xmlns:throttle="http://www.wso2.org/products/wso2commons/throttle"
            wsu:Id="WSO2MediatorThrottlingPolicy">
    <throttle:MediatorThrottleAssertion>
        <throttle:MaximumConcurrentAccess>1000</throttle:MaximumConcurrentAccess>
        <wsp:Policy>
            <throttle:ID throttle:type="IP">other</throttle:ID>           
        </wsp:Policy>
    </throttle:MediatorThrottleAssertion>
</wsp:Policy>

Start the API Manager, log in to its management console (https://localhost:9443/carbon) and click the Resource > Browse menu to view the registry.
Click the goverence/apimgt/applicationdata path to go to its detailed view.
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In the detail view, click the Resource link and upload the created policy file to the server as a registry resource.
In the management console, select the Service Bus > Source View menu.

The configurations of all APIs created in the API Manager instance opens. To engage the policy to a selected API, add it to your API definition. In this example, we add it to the login API.

Code Block

language	html/xml

<?xml version="1.0" encoding="UTF-8"?><api xmlns="http://ws.apache.org/ns/synapse" 
name="_WSO2AMLoginAPI_" context="/login">
    <resource methods="POST" url-mapping="/*">
        <inSequence>
            <send>
                <endpoint>
                    <address uri="https://localhost:9493/oauth2/token"/>
                </endpoint>
            </send>
        </inSequence>
        <outSequence>
            <send/>
        </outSequence>
    </resource>
    <handlers>
 <handler class="org.wso2.carbon.apimgt.gateway.handlers.throttling.APIThrottleHandler">
       <property name="id" value="A"/>
       <property name="policyKey" value="gov:/apimgt/applicationdata/throttle.xml"/>
       </handler> 
<handler class="org.wso2.carbon.apimgt.gateway.handlers.ext.APIManagerExtensionHandler"/>
    </handlers>
</api>

Note
Be sure to specify the same path used in step 3 in the policy key of your API definition.

You have successfully engaged a throttling policy to an API.

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