diff --git a/ger_gfonts/ger_gfonts/spiders/gfonts_spider.py b/ger_gfonts/ger_gfonts/spiders/gfonts_spider.py
index 5dad952..109f4ab 100644
--- a/ger_gfonts/ger_gfonts/spiders/gfonts_spider.py
+++ b/ger_gfonts/ger_gfonts/spiders/gfonts_spider.py
@@ -8,6 +8,7 @@ from urllib.parse import urlparse
 class GFontsSpider(scrapy.Spider):
     name = "gfonts"
     #start_urls = self.getUrls()
+    checked_domains = []
     custom_settings = {'CLOSESPIDER_PAGECOUNT': 2000}
 
     def __init__(self):
@@ -16,8 +17,11 @@ class GFontsSpider(scrapy.Spider):
     def parse(self, response):
         # check current url - german or eu (todo)
         # check if api.gfonts.com is found
-        # todo: check if google analytics is found
-        if (self.isGerman(response.url)):
+        # @todo: check if google analytics is found
+        parsed = urlparse(response.url)
+        self.checked_domains.append(parsed.hostname)
+        self.logNewDomain(response.url)
+        if self.isGerman(response.url):
             self.findGFonts(response)
             self.parseOn(response)
 
@@ -37,13 +41,13 @@ class GFontsSpider(scrapy.Spider):
         return tld == '.de'
 
     def isGerman(self, url):
-        if (not self.isGermanTLD(url)):
+        if not self.isGermanTLD(url):
             return self.isCountryGerman(url)
         return True
 
     def findGFonts(self, response):
         for links in response.css('head links'):
-            if ('fonts.googleapis.com' in links.attrib['href']):
+            if 'fonts.googleapis.com' in links.attrib['href']:
                 yield {
                     'url': response.url,
                     'gfonts': True,
@@ -52,13 +56,19 @@ class GFontsSpider(scrapy.Spider):
     def parseOn(self, response):
         for links in response.css('a'):
             url = links.attrib['href']
-            if (bool(urlparse(url).netloc)):
+            # parse valid urls
+            if validators.url(url) and bool(urlparse(url).netloc):
                 current = urlparse(response.url)
                 found = urlparse(url)
-                if (current.hostname != found.hostname):
+                if current.hostname != found.hostname and found.hostname not in self.checked_domains:
                     yield response.follow(url, callback=self.parse)
 
     def getUrls(self):
         with open('sites.txt') as sites_file:
             sites = sites_file.readlines()
             return map(lambda s: 'https://' + s,sites)
+
+    def logNewDomain(self, url):
+        print('############################################')
+        print('######   ' + url + '   #######')
+        print('############################################')
diff --git a/requirements.txt b/requirements.txt
index 268b0db..e6bcda8 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1 +1,2 @@
 scrapy
+validators