<PackageReference Include="System.ServiceModel.Primitives" Version="6.1.0" />

System.ServiceModel.Channels.ActionHeader

class ActionHeader : AddressingHeader
public string Action { get; }

public static ActionHeader Create(string action, AddressingVersion addressingVersion)

public static ActionHeader Create(XmlDictionaryString dictionaryAction, AddressingVersion addressingVersion)

public static ActionHeader ReadHeader(XmlDictionaryReader reader, AddressingVersion version, string actor, bool mustUnderstand, bool relay)

public static string ReadHeaderValue(XmlDictionaryReader reader, AddressingVersion addressingVersion)