def getPacketHeaderAttributesAndValues(self, streamObj, packetHeaderName, fieldName):
        """
        Parameters
           streamObj: <str>: configElementObj|highLevelStreamObj
                      Ex: /api/v1/sessions/{id}/ixnetwork/traffic/trafficItem/{1}/configElement/{id} 
                       or /api/v1/sessions/{id}/ixnetwork/traffic/trafficItem/{1}/highLevelStream/{id}

           packetHeaderName: <str>: Display Name of the stack.  Example: Ethernet II, VLAN, IPv4, TCP, etc. 

           fieldName: <str>: Display Name of the field.  Example: If packetHeaderName is Ethernet II, field names could be
                                    Destination MAC Address, Source MAC Address, Ethernet-Type and PFC Queue.
                                    You will have to know these field names. To view them, make your configurations
                                    and then go on the API browser and go to:

                            /api/v1/sessions/{id}/ixnetwork/traffic/trafficItem/{1}/configElement/{id}/stack/{id}/field

        Example:
            streamObj = '/api/v1/sessions/{id}/ixnetwork/traffic/trafficItem/{id}/configElement/{id}'
            data= trafficObj.getPacketHeaderAttributesAndValues(streamObj,
                                                                'Ethernet II', 'Source MAC Address')
            data['singleValue'] = For single value.
            data['startValue'] = If it is configured to increment.

        Returns
            All the attributes and values in JSON format.
        """
        response = self.ixnObj.get(self.ixnObj.httpHeader+streamObj+'/stack')
        for eachStack in response.json():
            stackHref = eachStack['links'][0]['href']
            response = self.ixnObj.get(self.ixnObj.httpHeader+stackHref)
            #  need to do strip() to response.json()['displayName'] because some displayName has trailing spaces. 
            #  for example:  "IPv4 " 
            if packetHeaderName == response.json()['displayName'].strip():
                response = self.ixnObj.get(self.ixnObj.httpHeader+stackHref+'/field')
                for eachField in response.json():
                    if fieldName == eachField['displayName']:
                        return eachField