What are Apigee Policies and what categories are available?

Policies are the processing building blocks of an Apigee proxy. Each policy is a pre-built, reusable, XML-configured processing step that you attach to a flow. Because policies are declarative, most tasks require no custom code. Apigee provides over 40 built-in policies organised into five categories.

<!-- VerifyAPIKey policy example -->
<VerifyAPIKey name="VerifyAPIKey">
  <DisplayName>Verify API Key</DisplayName>
  <APIKey ref="request.header.x-api-key"/>
</VerifyAPIKey>

<!-- Quota policy example -->
<Quota name="Quota" type="rollingwindow">
  <Interval>1</Interval>
  <TimeUnit>minute</TimeUnit>
  <Allow count="100"/>
</Quota>

<!-- AssignMessage policy example -->
<AssignMessage name="AM.SetBackendHeaders">
  <AssignTo createNew="false" type="request"/>
  <Set>
    <Headers>
      <Header name="x-internal-caller">apigee</Header>
    </Headers>
  </Set>
  <IgnoreUnresolvedVariables>true</IgnoreUnresolvedVariables>
</AssignMessage>

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