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# Initialization options

Specify options to configure the initialization of a media asset.

## Topics

### Options

[`AVURLAssetAllowsCellularAccessKey`](/documentation/AVFoundation/AVURLAssetAllowsCellularAccessKey)

A Boolean value that indicates whether the system can make network requests on behalf of the asset when connected to a cellular network.

[`AVURLAssetAllowsConstrainedNetworkAccessKey`](/documentation/AVFoundation/AVURLAssetAllowsConstrainedNetworkAccessKey)

A Boolean value that indicates whether the system allows network requests on behalf of this asset to use the constrained interface.

[`AVURLAssetAllowsExpensiveNetworkAccessKey`](/documentation/AVFoundation/AVURLAssetAllowsExpensiveNetworkAccessKey)

A Boolean value that indicates whether the system allows network requests on behalf of this asset to use the expensive interface.

[`AVURLAssetHTTPCookiesKey`](/documentation/AVFoundation/AVURLAssetHTTPCookiesKey)

The HTTP cookies that a URL asset may send with HTTP requests.

[`AVURLAssetHTTPUserAgentKey`](/documentation/AVFoundation/AVURLAssetHTTPUserAgentKey)

A key that specifies the user agent of requests that an asset makes.

[`AVURLAssetOverrideMIMETypeKey`](/documentation/AVFoundation/AVURLAssetOverrideMIMETypeKey)

A key that specifies the MIME type to use to identify the format of a media resource.

[`AVURLAssetPreferPreciseDurationAndTimingKey`](/documentation/AVFoundation/AVURLAssetPreferPreciseDurationAndTimingKey)

A Boolean value that indicates whether the asset should provide accurate duration and precise random access by time.

[`AVURLAssetPrimarySessionIdentifierKey`](/documentation/AVFoundation/AVURLAssetPrimarySessionIdentifierKey)

Specifies a UUID to set as the session identifier for HTTP requests that the asset makes.

[`AVURLAssetReferenceRestrictionsKey`](/documentation/AVFoundation/AVURLAssetReferenceRestrictionsKey)

A value that represents the restrictions used by the asset when resolving references to external media data.

[`AVURLAssetShouldSupportAliasDataReferencesKey`](/documentation/AVFoundation/AVURLAssetShouldSupportAliasDataReferencesKey)

A Boolean value that indicates whether the system parses and resolves alias data references in the asset.

[`AVURLAssetURLRequestAttributionKey`](/documentation/AVFoundation/AVURLAssetURLRequestAttributionKey)

A value that specifies the attribution of the URLs that this asset requests.

[`AVURLAssetShouldParseExternalSphericalTagsKey`](/documentation/AVFoundation/AVURLAssetShouldParseExternalSphericalTagsKey)

Indicates whether additional projected media signaling in the asset should be parsed and resolved as format description extensions.


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