diff --git a/waybackpy/cdx.py b/waybackpy/cdx.py
index 69c25b5..e5f2b2b 100644
--- a/waybackpy/cdx.py
+++ b/waybackpy/cdx.py
@@ -17,27 +17,27 @@ class Cdx:
     def __init__(
         self,
         url,
-        user_agent=default_user_agent,
+        user_agent=None,
         start_timestamp=None,
         end_timestamp=None,
         filters=[],
         match_type=None,
-        gzip=True,
+        gzip=None,
         collapses=[],
-        limit=10000,
+        limit=None,
     ):
         self.url = str(url).strip()
-        self.user_agent = str(user_agent)
+        self.user_agent = str(user_agent) if user_agent else default_user_agent
         self.start_timestamp = str(start_timestamp) if start_timestamp else None
         self.end_timestamp = str(end_timestamp) if end_timestamp else None
         self.filters = filters
         _check_filters(self.filters)
         self.match_type = str(match_type).strip() if match_type else None
         _check_match_type(self.match_type, self.url)
-        self.gzip = gzip
+        self.gzip = gzip if gzip else True
         self.collapses = collapses
         _check_collapses(self.collapses)
-        self.limit = limit
+        self.limit = limit if limit else 5000
         self.last_api_request_url = None
         self.use_page = False
 
@@ -87,7 +87,7 @@ class Cdx:
         if use_page == True:
 
             total_pages = _get_total_pages(self.url, self.user_agent)
-
+            blank_pages = 0
             for i in range(total_pages):
                 payload["page"] = str(i)
                 url, res = _get_response(
@@ -95,8 +95,14 @@ class Cdx:
                 )
 
                 self.last_api_request_url = url
+                text = res.text
+                if len(text) == 0:
+                    blank_pages += 1
 
-                yield res.text
+                if blank_pages >= 2:
+                    break
+
+                yield text
         else:
 
             payload["showResumeKey"] = "true"
diff --git a/waybackpy/utils.py b/waybackpy/utils.py
index 56a61f2..780d0a5 100644
--- a/waybackpy/utils.py
+++ b/waybackpy/utils.py
@@ -12,7 +12,8 @@ default_user_agent = "waybackpy python package - https://github.com/akamhy/wayba
 
 
 def _unix_ts_to_wayback_ts(unix_ts):
-    return datetime.utcfromtimestamp(int(unix_ts)).strftime('%Y%m%d%H%M%S')
+    return datetime.utcfromtimestamp(int(unix_ts)).strftime("%Y%m%d%H%M%S")
+
 
 def _add_payload(self, payload):
     if self.start_timestamp:
diff --git a/waybackpy/wrapper.py b/waybackpy/wrapper.py
index c9592dd..80491fe 100644
--- a/waybackpy/wrapper.py
+++ b/waybackpy/wrapper.py
@@ -166,7 +166,15 @@ class Url:
 
         return response.content.decode(encoding.replace("text/html", "UTF-8", 1))
 
-    def near(self, year=None, month=None, day=None, hour=None, minute=None, unix_timestamp=None):
+    def near(
+        self,
+        year=None,
+        month=None,
+        day=None,
+        hour=None,
+        minute=None,
+        unix_timestamp=None,
+    ):
         """
         Wayback Machine can have many archives of a webpage,
         sometimes we want archive close to a specific time.