Iron Web Analyzer

#$ironpythonanalyzer
#$NAME DNS Performace
#$AUTHOR Iron Web Analyzer
#$CONTACT hamed.ji@gmail.com
#$URL http://IronWebAnalyzer.SourceForge.net/Analyzers/DNS_Performance_Analyzer.html
#$DESCRIPTION Analyzer HTML pages for DNS problem performance
#$CONTENTTYPE text/html
#$TESTPATH http://localhost:5202/TestWeb/Default2.aspx
import clr
clr.AddReference("System")
import System

Domain = System.Uri(content.Url).Host.lower()

def CheckTagAtt(TagName, AttributeName):
	for i in content.AsHtml.GetElementByTag(TagName):
		if i.Attributes[AttributeName] != None:
			Source = i.Attributes[AttributeName].Value
			if System.Uri.IsWellFormedUriString(Source, System.UriKind.Absolute):
				NewDomain = System.Uri(Source).Host.lower()
				if NewDomain != Domain:
					content.AddMessage("Load data from another domain may down performance because need to resolve DNS. '"
						 + TagName + "' tag '" + AttributeName + "' attribute", "w", i.Line, i.LinePosition)

if content.AsHtml != None:
	CheckTagAtt("script", "src")
	CheckTagAtt("img", "src")
	CheckTagAtt("link", "href")