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‎articles/cdn/cdn-verizon-premium-rules-engine-reference-features.md

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description: Reference documentation for Azure CDN from Verizon Premium rules engine features.
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services: cdn
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author: duongau
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manager: kumudd
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ms.service: azure-cdn
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ms.topic: article
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ms.date: 06/02/2020
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ms.date: 02/27/2023
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ms.author: duau
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---
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This article lists detailed descriptions of the available features for Azure Content Delivery Network (CDN) [Rules Engine](cdn-verizon-premium-rules-engine.md).
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The third part of a rule is the feature. A feature defines the type of action that is applied to the request type that is identified by a set of match conditions.
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The third part of a rule is the feature. A feature defines the type of action that is applied to the request type that gets identified by a set of match conditions.
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## <a name="top"></a>Azure CDN from Verizon Premium rules engine features reference
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| Name | Purpose |
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|------------|-------------------------------------------------------------------|
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| [Deny Access (403)](https://docs.vdms.com/cdn/Content/HRE/F/Deny-Access-403.htm) | Determines whether all requests are rejected with a 403 Forbidden response. |
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| [Token Auth](https://docs.vdms.com/cdn/Content/HRE/F/Token-Auth.htm) | Determines whether Token-Based Authentication will be applied to a request. |
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| [Token Auth Denial Code](https://docs.vdms.com/cdn/Content/HRE/F/Token-Auth-Denial-Code.htm) | Determines the type of response that will be returned to a user when a request is denied due to Token-Based Authentication. |
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| [Token Auth Ignore URL Case](https://docs.vdms.com/cdn/Content/HRE/F/Token-Auth-Ignore-URL-Case.htm) | Determines whether URL comparisons made by Token-Based Authentication will be case-sensitive. |
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| [Token Auth](https://docs.vdms.com/cdn/Content/HRE/F/Token-Auth.htm) | Determines whether Token-Based Authentication gets applied to a request. |
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| [Token Auth Denial Code](https://docs.vdms.com/cdn/Content/HRE/F/Token-Auth-Denial-Code.htm) | Determines the type of response that gets returned to a user when a request is denied due to Token-Based Authentication. |
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| [Token Auth Ignore URL Case](https://docs.vdms.com/cdn/Content/HRE/F/Token-Auth-Ignore-URL-Case.htm) | Determines whether URL comparisons made by Token-Based Authentication are case-sensitive. |
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| [Token Auth Parameter](https://docs.vdms.com/cdn/Content/HRE/F/Token-Auth-Parameter.htm) | Determines whether the Token-Based Authentication query string parameter should be renamed. |
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| Name | Purpose |
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|------------|-------------------------------------------------------------------|
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| [Bandwidth Parameters](https://docs.vdms.com/cdn/Content/HRE/F/Bandwidth-Parameters.htm) | Determines whether bandwidth throttling parameters (i.e., ec_rate and ec_prebuf) will be active. |
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| [Bandwidth Parameters](https://docs.vdms.com/cdn/Content/HRE/F/Bandwidth-Parameters.htm) | Determines whether bandwidth throttling parameters (for example, ec_rate and ec_prebuf) are active. |
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| [Bandwidth Throttling](https://docs.vdms.com/cdn/Content/HRE/F/Bandwidth-Throttling.htm) | Throttles the bandwidth for the response provided by our edge servers. |
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| [Bypass Cache](https://docs.vdms.com/cdn/Content/HRE/F/Bypass-Cache.htm) | Determines whether the request can leverage our caching technology. |
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| [Bypass Cache](https://docs.vdms.com/cdn/Content/HRE/F/Bypass-Cache.htm) | Determines whether the request can use our caching technology. |
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| [Cache-Control Header Treatment](https://docs.vdms.com/cdn/Content/HRE/F/Cache-Control-Header-Treatment.htm) | Controls the generation of Cache-Control headers by the edge server when External Max-Age feature is active. |
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| [Cache-Key Query String](https://docs.vdms.com/cdn/Content/HRE/F/Cache-Key-Query-String.htm) | Determines whether the **cache-key*** will include or exclude query string parameters associated with a request. <br> _* A relative path that uniquely identifies an asset for the purpose of caching. Our edge servers use this relative path when checking for cached content. By default, a cache-key will not contain query string parameters._ |
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| [Cache-Key Query String](https://docs.vdms.com/cdn/Content/HRE/F/Cache-Key-Query-String.htm) | Determines whether the **cache-key*** gets included or excluded query string parameters associated with a request. <br> _* A relative path that uniquely identifies an asset for caching. Our edge servers use this relative path when checking for cached content. By default, a cache-key doesn't contain query string parameters._ |
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| [Cache-Key Rewrite](https://docs.vdms.com/cdn/Content/HRE/F/Cache-Key-Rewrite.htm) | Rewrites the cache-key associated with a request. |
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| [Complete Cache Fill](https://docs.vdms.com/cdn/Content/HRE/F/Complete-Cache-Fill.htm) | Determines what happens when a request results in a partial cache miss on an edge server. |
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| [Compress File Types](https://docs.vdms.com/cdn/Content/HRE/F/Compress-File-Types.htm) | Defines the file formats that will be compressed on the server. |
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| [Compress File Types](https://docs.vdms.com/cdn/Content/HRE/F/Compress-File-Types.htm) | Defines the file formats that get compressed on the server. |
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| [Default Internal Max-Age](https://docs.vdms.com/cdn/Content/HRE/F/Default-Internal-Max-Age.htm) | Determines the default max-age interval for edge server to origin server cache revalidation. |
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| [Expires Header Treatment](https://docs.vdms.com/cdn/Content/HRE/F/Expires-Header-Treatment.htm) | Controls the generation of Expires headers by an edge server when the External Max-Age feature is active. |
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| [External Max-Age](https://docs.vdms.com/cdn/Content/HRE/F/External-Max-Age.htm) | Determines the max-age interval for browser to edge server cache revalidation. |
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| [Force Internal Max-Age](https://docs.vdms.com/cdn/Content/HRE/F/Force-Internal-Max-Age.htm) | Determines the max-age interval for edge server to origin server cache revalidation. |
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| [H.264 Support (HTTP Progressive Download)](https://docs.vdms.com/cdn/Content/HRE/F/H.264-Support-HPD.htm) | Determines the types of H.264 file formats that may be used to stream content. |
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| [H.264 Support Video Seek Params](https://docs.vdms.com/cdn/Content/HRE/F/H.264-Support-VSP-HPD.htm) | Overrides the names assigned to parameters that control seeking through H.264 media when using HTTP Progressive Download. |
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| [Honor No-Cache Request](https://docs.vdms.com/cdn/Content/HRE/F/Honor-No-Cache-Request.htm) | Determines whether an HTTP client's no-cache requests will be forwarded to the origin server. |
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| [Ignore Origin No-Cache](https://docs.vdms.com/cdn/Content/HRE/F/Ignore-Origin-No-Cache.htm) | Determines whether our CDN will ignore certain directives served from an origin server. |
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| [Ignore Unsatisfiable Ranges](https://docs.vdms.com/cdn/Content/HRE/F/Ignore-Unsatisfiable-Ranges.htm) | Determines the response that will be returned to clients when a request generates a 416 Requested Range Not Satisfiable status code. |
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| [Honor No-Cache Request](https://docs.vdms.com/cdn/Content/HRE/F/Honor-No-Cache-Request.htm) | Determines whether an HTTP client's no-cache requests gets forwarded to the origin server. |
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| [Ignore Origin No-Cache](https://docs.vdms.com/cdn/Content/HRE/F/Ignore-Origin-No-Cache.htm) | Determines whether our CDN ignores certain directives served from an origin server. |
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| [Ignore Unsatisfiable Ranges](https://docs.vdms.com/cdn/Content/HRE/F/Ignore-Unsatisfiable-Ranges.htm) | Determines the response that is returned to clients when a request generates a 416 Requested Range Not Satisfiable status code. |
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| [Internal Max-Stale](https://docs.vdms.com/cdn/Content/HRE/F/Internal-Max-Stale.htm) | Controls how long past the normal expiration time a cached asset may be served from an edge server when the edge server is unable to revalidate the cached asset with the origin server. |
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| [Partial Cache Sharing](https://docs.vdms.com/cdn/Content/HRE/F/Partial-Cache-Sharing.htm) | Determines whether a request can generate partially cached content. |
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| [Prevalidate Cached Content](https://docs.vdms.com/cdn/Content/HRE/F/Prevalidate-Cached-Content.htm) | Determines whether cached content will be eligible for early revalidation before its TTL expires. |
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| [Refresh Zero-Byte Cache Files](https://docs.vdms.com/cdn/Content/HRE/F/Refresh-Zero-Byte-Cache-Files.htm) | Determines how an HTTP client's request for a 0-byte cache asset is handled by our edge servers. |
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| [Prevalidate Cached Content](https://docs.vdms.com/cdn/Content/HRE/F/Prevalidate-Cached-Content.htm) | Determines whether cached content is eligible for early revalidation before its TTL expires. |
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| [Refresh Zero-Byte Cache Files](https://docs.vdms.com/cdn/Content/HRE/F/Refresh-Zero-Byte-Cache-Files.htm) | Determines how an HTTP client's request for a 0-byte cache asset gets handled by our edge servers. |
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| [Set Cacheable Status Codes](https://docs.vdms.com/cdn/Content/HRE/F/Set-Cacheable-Status-Codes.htm) | Defines the set of status codes that can result in cached content. |
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| [Stale Content Delivery on Error](https://docs.vdms.com/cdn/Content/HRE/F/Stale-Content-Delivery-on-Error.htm) | Determines whether expired cached content will be delivered when an error occurs during cache revalidation or when retrieving the requested content from the customer origin server. |
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| [Stale Content Delivery on Error](https://docs.vdms.com/cdn/Content/HRE/F/Stale-Content-Delivery-on-Error.htm) | Determines whether expired cached content is delivered when an error occurs during cache revalidation or when retrieving the requested content from the customer origin server. |
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| [Stale While Revalidate](https://docs.vdms.com/cdn/Content/HRE/F/Stale-While-Revalidate.htm) | Improves performance by allowing our edge servers to serve stale client to the requester while revalidation takes place. |
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| Name | Purpose |
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| [Age Response Header](https://docs.vdms.com/cdn/Content/HRE/F/Age-Response-Header.htm) | Determines whether an Age response header will be included in the response sent to the requester. |
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| [Age Response Header](https://docs.vdms.com/cdn/Content/HRE/F/Age-Response-Header.htm) | Determines whether an Age response header is included in the response sent to the requester. |
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| [Debug Cache Response Headers](https://docs.vdms.com/cdn/Content/HRE/F/Debug-Cache-Response-Headers.htm) | Determines whether a response may include the [X-EC-Debug response header](https://docs.vdms.com/cdn/Content/Knowledge_Base/X_EC_Debug.htm) which provides information on the cache policy for the requested asset. |
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| [Modify Client Request Header](https://docs.vdms.com/cdn/Content/HRE/F/Modify-Client-Request-Header.htm) | Overwrites, appends, or deletes a header from a request. |
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| [Modify Client Response Header](https://docs.vdms.com/cdn/Content/HRE/F/Modify-Client-Response-Header.htm) | Overwrites, appends, or deletes a header from a response. |
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| Name | Purpose |
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| [Custom Log Field 1](https://docs.vdms.com/cdn/Content/HRE/F/Custom-Log-Field-1.htm) | Determines the format and the content that will be assigned to the custom log field in a raw log file. |
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| [Log Query String](https://docs.vdms.com/cdn/Content/HRE/F/Log-Query-String.htm) | Determines whether a query string will be stored along with the URL in access logs. |
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| [Custom Log Field 1](https://docs.vdms.com/cdn/Content/HRE/F/Custom-Log-Field-1.htm) | Determines the format and the content that is assigned to the custom log field in a raw log file. |
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| [Log Query String](https://docs.vdms.com/cdn/Content/HRE/F/Log-Query-String.htm) | Determines whether a query string is stored along with the URL in access logs. |
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### <a name="optimize"></a>Optimize
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These features determine whether a request will undergo the optimizations provided by Edge Optimizer.
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These features determine whether a request undergoes the optimizations provided by Edge Optimizer.
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| [Maximum Keep-Alive Requests](https://docs.vdms.com/cdn/Content/HRE/F/Maximum-Keep-Alive-Requests.htm) | Defines the maximum number of requests for a Keep-Alive connection before it is closed. |
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| [Proxy Special Headers](https://docs.vdms.com/cdn/Content/HRE/F/Proxy-Special-Headers.htm) | Defines the set of [CDN-specific request headers](https://docs.vdms.com/cdn/Content/Knowledge_Base/Request-Format.htm#RequestHeaders) that will be forwarded from an edge server to an origin server. |
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| [Maximum Keep-Alive Requests](https://docs.vdms.com/cdn/Content/HRE/F/Maximum-Keep-Alive-Requests.htm) | Defines the maximum number of requests for a Keep-Alive connection before it's closed. |
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| [Proxy Special Headers](https://docs.vdms.com/cdn/Content/HRE/F/Proxy-Special-Headers.htm) | Defines the set of [CDN-specific request headers](https://docs.vdms.com/cdn/Content/Knowledge_Base/Request-Format.htm#RequestHeaders) that gets forwarded from an edge server to an origin server. |
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### <a name="specialty"></a>Specialty
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These features provide advanced functionality that should only be used by advanced users.
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These features provide advanced functionality and should get used by advanced users.
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| [Cacheable HTTP Methods](https://docs.vdms.com/cdn/Content/HRE/F/Cacheable-HTTP-Methods.htm) | Determines the set of additional HTTP methods that can be cached on our network. |
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| [Cacheable HTTP Methods](https://docs.vdms.com/cdn/Content/HRE/F/Cacheable-HTTP-Methods.htm) | Determines the set of extra HTTP methods that can be cached on our network. |
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| [Cacheable Request Body Size](https://docs.vdms.com/cdn/Content/HRE/F/Cacheable-Request-Body-Size.htm) | Defines the threshold for determining whether a POST response can be cached. |
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| [QUIC](https://docs.vdms.com/cdn/Content/HRE/F/QUIC.htm) | Determines whether the client will be informed that our CDN service supports QUIC. |
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| [QUIC](https://docs.vdms.com/cdn/Content/HRE/F/QUIC.htm) | Determines whether the client is informed that our CDN service supports QUIC. |
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| [Streaming Optimization](https://docs.vdms.com/cdn/Content/HRE/F/Streaming-Optimization.htm) | Tunes your caching configuration to optimize performance for live streams and to reduce the load on the origin server. |
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| [User Variable](https://docs.vdms.com/cdn/Content/HRE/F/User-Variable.htm) | Assigns a value to a user-defined variable that is passed to your bespoke traffic processing solution. |
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