webconfig question

Hi

What is the role of <clear/> in below code snipped and will it have any effect on functionality of <add name="X-XSS-Protection" value="1"/>


<httpProtocol>
      <customHeaders>
        <clear/>
        <add name="X-Frame-Options" value="DENY"/>
        <add name="X-XSS-Protection" value="1"/>
      </customHeaders>
    </httpProtocol>

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Thanks
meetDinesh
Dinesh KumarAsked:
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Dan McFaddenSystems EngineerCommented:
It removes all previously declared options.

Reference link:  http://msdn.microsoft.com/en-us/library/aa903345(v=vs.71).aspx

Dan
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Dinesh KumarAuthor Commented:
1. in my case, I see that I  am having <customHeaders> only once, do <clear/>
 solve any purpose or can I safely remove it?

2. If I remove it I want to ensure that, the following should not affect in any way:

 <add name="X-XSS-Protection" value="1"/>
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Dan McFaddenSystems EngineerCommented:
In your example config, clear would remove any previously declared (and inherited) keys from your application.  Only the defined keys after the clear will be used.

If you remove it, any upstream (parent) configuration will be included in your app.  But declaring this in your web.config should override anything that inherited.

Dan
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Dan McFaddenSystems EngineerCommented:
You can also read thru the article.  Maybe it will make it clearer for you:

http://stackoverflow.com/questions/7626440/web-config-clear

Dan
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Dinesh KumarAuthor Commented:
in my case, it will override  <customHeaders>
defined in machine config?

as I see there is one tag only in  web.config <customHeaders>
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Dan McFaddenSystems EngineerCommented:
A clear will remove the customHeaders config section from the web app that uses the configuration above in its web.config.

Then only your X-Frame-Options and X-XSS-Protection items will be used.
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