У вашего броузера проблема в совместимости с HTML5
SoapUi Groovy Script Hello World program.
1) Get Request - list of Person (json response);
2) Post Request - post a new person (with json parameter).
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WCF Code and SOAPUI Project:
https://drive.google.com/file/d/0B61-MHkMYqM4dFJ6WVBKZW02RUU/
Note: groovy script is inside soapui xml project file, you can see it with notepad!