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WebCmdlets: WebResponseObject.CoreClr.cs every get on Headers creates a new Dictionary #3842

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@SteveL-MSFT

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@SteveL-MSFT
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The Headers property creates a new Dictionary which then gets populated. Users typically do something like

if (obj.Headers.ContainsKey("Something"))
{
    obj.Headers["Something"] ...
}

which now instantiates a new Dictionary twice, we should optimize this code. consider using a ReadOnlyDictionary

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    WG-Cmdlets-Utilitycmdlets in the Microsoft.PowerShell.Utility modulecmdlets in the Microsoft.PowerShell.Utility module

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