AI-generated Key Takeaways
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          GMTSRequestis an abstract class serving as a request object.
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          The requestHeaderproperty allows for specifying additional request conditions.
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          Use initWithRequestHeader:to initialize aGMTSRequestobject.
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          The default initmethod is unavailable;initWithRequestHeader:should be used instead.
GMTSRequest
@interface GMTSRequest : NSObject <NSCopying, NSMutableCopying>Request object that is an abstract class.
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                  Header of the request, to specify extra request conditions. DeclarationSwift @NSCopying var requestHeader: GMTSRequestHeader? { get }Objective-C @property (nonatomic, copy, readonly, nullable) GMTSRequestHeader *requestHeader;
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                  Initialization of the object. DeclarationSwift init(requestHeader: GMTSRequestHeader?)Objective-C - (nonnull instancetype)initWithRequestHeader: (nullable GMTSRequestHeader *)requestHeader;ParametersrequestHeaderA request header object to bind with the current request. 
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                  Unavailable Use -initWithRequestHeader:instead.DeclarationObjective-C - (nonnull instancetype)init;