I was having problems capturing SOAP requests to a local WCF service using Fiddler. To see these I tried a numebr of things, these final settings made the difference:
Remove any filters
Add SOAP custom filters using fiddler script, at the start of the class:
and also into OnBeginResponse method:
Enable SOAP filters
Mark Cooper 
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FiddlerScript Error
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FiddlerScript compilation failed on line 107:
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var strRequestStart : String = “><";
ERROR LINE –> var iPos = oSession.utilFindInRequest(strRequestStart, false);
if (iPos != -1)
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Variable 'oSession' has not been declared
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OK
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