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[APIM] Policy expression support in policies -1
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‎articles/api-management/authentication-basic-policy.md

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| Attribute | Description | Required | Default |
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| ----------------- | ------------------------------------------------------ | -------- | ------- |
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|username|Specifies the username of the Basic credential.|Yes|N/A|
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|password|Specifies the password of the Basic credential.|Yes|N/A|
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|username|Specifies the username of the Basic credential. Policy expressions are allowed. |Yes|N/A|
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|password|Specifies the password of the Basic credential. Policy expressions are allowed. |Yes|N/A|
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## Usage

‎articles/api-management/authentication-certificate-policy.md

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| Attribute | Description | Required | Default |
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| ----------------- | ------------------------------------------------------ | -------- | ------- |
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|thumbprint|The thumbprint for the client certificate.|Either `thumbprint` or `certificate-id` can be present.|N/A|
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|certificate-id|The certificate resource name.|Either `thumbprint` or `certificate-id` can be present.|N/A|
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|body|Client certificate as a byte array. Use if the certificate isn't retrieved from the built-in certificate store.|No|N/A|
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|password|Password for the client certificate.|Use if certificate specified in `body` is password protected.|N/A|
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|thumbprint|The thumbprint for the client certificate. Policy expressions are allowed. |Either `thumbprint` or `certificate-id` can be present.|N/A|
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|certificate-id|The certificate resource name. Policy expressions are allowed.|Either `thumbprint` or `certificate-id` can be present.|N/A|
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|body|Client certificate as a byte array. Use if the certificate isn't retrieved from the built-in certificate store. Policy expressions are allowed.|No|N/A|
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|password|Password for the client certificate. Policy expressions are allowed.|Use if certificate specified in `body` is password protected.|N/A|
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## Usage
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‎articles/api-management/authentication-managed-identity-policy.md

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| ----------------- | ------------------------------------------------------ | -------- | ------- |
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|resource|String. The application ID of the target web API (secured resource) in Azure Active Directory. Policy expressions are allowed. |Yes|N/A|
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|client-id|String. The client ID of the user-assigned identity in Azure Active Directory. Policy expressions are not allowed. |No|system-assigned identity|
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|output-token-variable-name|String. Name of the context variable that will receive token value as an object of type `string`. Policy expresssions are not allowed. |No|N/A|
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|output-token-variable-name|String. Name of the context variable that will receive token value as an object of type `string`. Policy expressions are not allowed. |No|N/A|
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|ignore-error|Boolean. If set to `true`, the policy pipeline will continue to execute even if an access token is not obtained.|No|`false`|
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‎articles/api-management/cache-lookup-policy.md

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| Attribute | Description | Required | Default |
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| ----------------- | ------------------------------------------------------ | -------- | ------- |
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| allow-private-response-caching | When set to `true`, allows caching of requests that contain an Authorization header. | No | `false` |
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| caching-type | Choose between the following values of the attribute:<br />- `internal` to use the [built-in API Management cache](api-management-howto-cache.md),<br />- `external` to use the external cache as described in [Use an external Azure Cache for Redis in Azure API Management](api-management-howto-cache-external.md),<br />- `prefer-external` to use external cache if configured or internal cache otherwise. | No | `prefer-external` |
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| downstream-caching-type | This attribute must be set to one of the following values.<br /><br /> - none - downstream caching is not allowed.<br />- private - downstream private caching is allowed.<br />- public - private and shared downstream caching is allowed. | No | none |
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| must-revalidate | When downstream caching is enabled this attribute turns on or off the `must-revalidate` cache control directive in gateway responses. | No | `true` |
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| vary-by-developer | Set to `true` to cache responses per developer account that owns [subscription key](./api-management-subscriptions.md) included in the request. | Yes | `false` |
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| vary-by-developer-groups | Set to `true` to cache responses per [user group](./api-management-howto-create-groups.md). | Yes | `false` |
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| allow-private-response-caching | When set to `true`, allows caching of requests that contain an Authorization header. Policy expressions are allowed. | No | `false` |
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| caching-type | Choose between the following values of the attribute:<br />- `internal` to use the [built-in API Management cache](api-management-howto-cache.md),<br />- `external` to use the external cache as described in [Use an external Azure Cache for Redis in Azure API Management](api-management-howto-cache-external.md),<br />- `prefer-external` to use external cache if configured or internal cache otherwise.<br/><br/>Policy expressions are not allowed. | No | `prefer-external` |
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| downstream-caching-type | This attribute must be set to one of the following values.<br /><br /> - none - downstream caching is not allowed.<br />- private - downstream private caching is allowed.<br />- public - private and shared downstream caching is allowed.<br/><br/>Policy expressions are allowed. | No | none |
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| must-revalidate | When downstream caching is enabled this attribute turns on or off the `must-revalidate` cache control directive in gateway responses. Policy expressions are allowed. | No | `true` |
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| vary-by-developer | Set to `true` to cache responses per developer account that owns [subscription key](./api-management-subscriptions.md) included in the request. Policy expressions are allowed. | Yes | `false` |
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| vary-by-developer-groups | Set to `true` to cache responses per [user group](./api-management-howto-create-groups.md). Policy expressions are allowed. | Yes | `false` |
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## Elements

‎articles/api-management/cache-lookup-value-policy.md

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| Attribute | Description | Required | Default |
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|---|--|--|--|
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| caching-type | Choose between the following values of the attribute:<br />- `internal` to use the [built-in API Management cache](api-management-howto-cache.md),<br />- `external` to use the external cache as described in [Use an external Azure Cache for Redis in Azure API Management](api-management-howto-cache-external.md),<br />- `prefer-external` to use external cache if configured or internal cache otherwise. | No | `prefer-external` |
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| default-value | A value that will be assigned to the variable if the cache key lookup resulted in a miss. If this attribute is not specified, `null` is assigned. | No | `null` |
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| key | Cache key value to use in the lookup. | Yes | N/A |
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| variable-name | Name of the [context variable](api-management-policy-expressions.md#ContextVariables) the looked up value will be assigned to, if lookup is successful. If lookup results in a miss, the variable will not be set. | Yes | N/A |
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| caching-type | Choose between the following values of the attribute:<br />- `internal` to use the [built-in API Management cache](api-management-howto-cache.md),<br />- `external` to use the external cache as described in [Use an external Azure Cache for Redis in Azure API Management](api-management-howto-cache-external.md),<br />- `prefer-external` to use external cache if configured or internal cache otherwise.<br/><br/>Policy expressions are not allowed. | No | `prefer-external` |
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| default-value | A value that will be assigned to the variable if the cache key lookup resulted in a miss. If this attribute is not specified, `null` is assigned. Policy expressions are allowed. | No | `null` |
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| key | Cache key value to use in the lookup. Policy expressions are allowed. | Yes | N/A |
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| variable-name | Name of the [context variable](api-management-policy-expressions.md#ContextVariables) the looked up value will be assigned to, if lookup is successful. If lookup results in a miss, the variable will not be set. Policy expressions are not allowed. | Yes | N/A |
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## Usage

‎articles/api-management/cache-remove-value-policy.md

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| Attribute | Description | Required | Default |
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|---|--|--|--|
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| caching-type | Choose between the following values of the attribute:<br />- `internal` to use the [built-in API Management cache](api-management-howto-cache.md),<br />- `external` to use the external cache as described in [Use an external Azure Cache for Redis in Azure API Management](api-management-howto-cache-external.md),<br />- `prefer-external` to use external cache if configured or internal cache otherwise. | No | `prefer-external` |
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| key | The key of the previously cached value to be removed from the cache. | Yes | N/A |
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| caching-type | Choose between the following values of the attribute:<br />- `internal` to use the [built-in API Management cache](api-management-howto-cache.md),<br />- `external` to use the external cache as described in [Use an external Azure Cache for Redis in Azure API Management](api-management-howto-cache-external.md),<br />- `prefer-external` to use external cache if configured or internal cache otherwise. <br/><br/>Policy expressions are not allowed. | No | `prefer-external` |
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| key | The key of the previously cached value to be removed from the cache. Policy expressions are allowed. | Yes | N/A |
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## Usage
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‎articles/api-management/cache-store-policy.md

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| Attribute | Description | Required | Default |
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| ----------------- | ------------------------------------------------------ | -------- | ------- |
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| duration | Time-to-live of the cached entries, specified in seconds. | Yes | N/A |
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| cache-response | Set to `true` to cache the current HTTP response. If the attribute is omitted or set to `false`, only HTTP responses with the status code `200 OK` are cached. | No | `false` |
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| duration | Time-to-live of the cached entries, specified in seconds. Policy expressions are allowed. | Yes | N/A |
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| cache-response | Set to `true` to cache the current HTTP response. If the attribute is omitted or set to `false`, only HTTP responses with the status code `200 OK` are cached. Policy expressions are allowed. | No | `false` |
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## Usage
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‎articles/api-management/cache-store-value-policy.md

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| Attribute | Description | Required | Default |
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|---|--|--|--|
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| caching-type | Choose between the following values of the attribute:<br />- `internal` to use the [built-in API Management cache](api-management-howto-cache.md),<br />- `external` to use the external cache as described in [Use an external Azure Cache for Redis in Azure API Management](api-management-howto-cache-external.md),<br />- `prefer-external` to use external cache if configured or internal cache otherwise. | No | `prefer-external` |
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| duration | Value will be cached for the provided duration value, specified in seconds. | Yes | N/A |
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| key | Cache key the value will be stored under. | Yes | N/A |
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| value | The value to be cached. | Yes | N/A |
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| caching-type | Choose between the following values of the attribute:<br />- `internal` to use the [built-in API Management cache](api-management-howto-cache.md),<br />- `external` to use the external cache as described in [Use an external Azure Cache for Redis in Azure API Management](api-management-howto-cache-external.md),<br />- `prefer-external` to use external cache if configured or internal cache otherwise.<br/><br/>Policy expressions are not allowed.| No | `prefer-external` |
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| duration | Value will be cached for the provided duration value, specified in seconds. Policy expressions are allowed. | Yes | N/A |
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| key | Cache key the value will be stored under. Policy expressions are allowed. | Yes | N/A |
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| value | The value to be cached. Policy expressions are allowed. | Yes | N/A |
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## Usage
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