prototyping HAR functionality

har.py

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+'''
+Parses a list of HTTPFlows into data suitable for writing to a HAR file.
+'''
+
+class Page:
+    def __init__(self, title, startedDateTime):
+        self.title = title
+        self.startedDateTime = startedDateTime
+
+class Entry:
+    def __init__(self, request, response):
+        self.request = request
+        self.response = response
+        self.total_time = (response.end_time - request.start_time) + startup_time
+
+def extract_data(httpdata):
+    '''
+    Extracts http data from the httpdata and converts it into a python dict
+    suitable for writing straight out as a HAR.
+
+    Args:
+    httpflows = [http.MessagePair]
+
+    Returns:
+    {} = HAR data
+    '''