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Error 400 - Ampersand (&) on URL parameter value in iis 7.5

Posted on 2014-02-17
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Last Modified: 2014-03-15
Could not find the right solution during my web search so I am going to ask this question.

I have a url like this

http://blahsub.blahdomain.com/blahsite/blahservice.svc/blahhandler?param=12345&msg=value%26more+value

My problem is that when there is a request and the "msg" has a value with an ampersand(%26) it turns the rest of the url into part of another parameter like so:

 msg=value&more+value

and returning  error 400 as a bad request.

I have the URL Rewrite module installed.

How can I allow ampersands in parameter values?

There are plenty of articles online but the ones that I have looked at has not given me the solution that I need.  

I need to use the URL Rewrite in IIS to do this.

add a rule?

thanks for your help.
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Question by:jonjojr
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Expert Comment

by:becraig
ID: 39866333
You might want to switch on verification compatibility:
http://adorr.net/2010/01/configure-iis-to-accept-url-with-special-characters.html
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Author Comment

by:jonjojr
ID: 39866347
is there another solution if the server does not have Service Pack 1 on .Net 1.1?
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Accepted Solution

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becraig earned 500 total points
ID: 39866350
If you look at the first solution it allows restricted chars:
through setting,
HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\HTTP\Parameters
AllowRestrictedChars

To the best of my knowledge there is no SP restriction on this approach.

Just curious though, why would you not have the later .net frameworks and applicable SPs  ?

There is backward compatibility and most .net FWs can exist together.
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Author Comment

by:jonjojr
ID: 39866391
I was not expecting an answer so quickly, let me try this on the servers tomorrow morning and give feedback.
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Expert Comment

by:becraig
ID: 39896404
If you have any issues with the suggested approach, let me know so we can take another look.
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Author Closing Comment

by:jonjojr
ID: 39931865
Your solution worked. It is an old legacy system that it just works. So we don't touch it. Thank you for the answer.
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