Optional
aInstancePtr: objectA run time mechanism for interface discovery.
NS_OK if the interface is supported by the associated instance, NS_NOINTERFACE if it is not.
aInstancePtr must not be null.
[in] A requested interface IID
[out] A pointer to an interface pointer to receive the result.
Called by the nsIHttpChannel implementation when visiting request and response headers.
any exception to terminate enumeration
the header being visited.
the header value (possibly a comma delimited list).
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Implement this interface to visit http headers.