Newbie so please be gentle. 

I have a selenium script which generates a har file, code is as follows: 

```
proxy.har  # returns a HAR
for ent in proxy.har['log']['entries']:
    _url = ent['request']['headers']
    _response = ent['response']
    #print(ent)
    for item in ent['request']['headers']:
        print(item)

```

Here is the output: 

```
{'value': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/5 (KHTML, like Gecko) Chrome/ Safari/', 'name': 'User-Agent'}
{'value': 'application/json', 'name': 'content-type'}
{'value': '8d14747f41e552da0076374b6646b1d309763357195e2ec5b6be6da1d12dcf6801113', 'name': 'a-security-token'}
{'value': '8e9720fcead251fafd2c215443e3c6e7555667990f00bcfad70127e340048eb901113', 'name': 'ccu'}
{'value': 'isAjax:true', 'name': 'ADRUM'}
{'value': '*/*', 'name': 'Accept'}

```

I want to filter out the a-security token value and the ccu value. I have tried using lambda, but it just prints nothings here is my lambda code: 

```
filtered_item = filter(lambda d: 'ccu' in d , item)
for d in filtered_item:
   print(d)

```

O