webconfig question

Posted on 2014-10-22
Last Modified: 2014-11-09

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"/>

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

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Question by:Dinesh Kumar
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Expert Comment

by:Dan McFadden
ID: 40396579
It removes all previously declared options.

Reference link:


Author Comment

by:Dinesh Kumar
ID: 40396613
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"/>
LVL 26

Expert Comment

by:Dan McFadden
ID: 40396627
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.

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LVL 26

Expert Comment

by:Dan McFadden
ID: 40396632
You can also read thru the article.  Maybe it will make it clearer for you:


Author Comment

by:Dinesh Kumar
ID: 40396697
in my case, it will override  <customHeaders>
defined in machine config?

as I see there is one tag only in  web.config <customHeaders>
LVL 26

Accepted Solution

Dan McFadden earned 500 total points
ID: 40396723
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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