How to setRequestContent in Mock in OnRequest Script to replace first character (is it a BUG??)

This code works well.

Problem was in my script that I call at mock response.

You can use this code to convert UTF-8-BOM request to UTF-8 without BOM.

def mockRequestContent
try {
 	mockRequestContent = mockRequest.getRequestContent()
 	mockRequest.setRequestContent(mockRequestContent.substring(1))
} catch (Exception e) {
	log.info(e)
}