This Python AWS Lamda function, returns True / False if a given AWS API query parameter (URL) has an HTTP security CSP header present

HTTP_Security_Header_check_Python_AWS_Lamda_PoC.py

### Nicholas Leader
### Python PoC given AWS API query parameter of URL, return if HTTP security header CSP policy is present
### Written as AWS Lamda (serverless) function
### 8.14.2019
###
import json

def lambda_handler(event, context):
        import urllib.request 
        input = event["queryStringParameters"]['URL']
        
        req = urllib.request.Request(input, #test URLs 'https://securityheaders.com'#securityHeaders has the CSP, twitter doesn't
        data=None,
        headers={'User-Agent': 'Mozilla/5.0 (Macintosh; Intel Mac OS X 10_9_3) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/35.0.1916.47 Safari/537.36'} ) 
       
        f = urllib.request.urlopen(req)
     
        Headerdict = dict(f.info()) # add the header meta data to a dictionary
        # print( Headerdict ['Content-Security-Policy']) # print contents of hashtable - dictionary entry
        try: # needed to validate if statement, otherwise will exit with error
            if Headerdict['Content-Security-Policy']:
                #print ("CSP present")
                Headerpresent = "True"
        except:
          #  print('CSP not present')
          Headerpresent = "False"
        return {
            'statusCode': 200,
            'body': json.dumps(Headerpresent) # if you want to return the whole header:  Headerdict['Content-Security-Policy'])
    }