diff --git a/webarchiv.py b/webarchiv.py
index 36ca857e846f617ebd65d80a103a6d9291bc0b7f..b166098fe935e3e7e22707ced8a1825f0edc3009 100644
--- a/webarchiv.py
+++ b/webarchiv.py
@@ -8,7 +8,7 @@ _datetime_format_string = '%Y%m%d%H%M%S'
 
 
 EXTRACTOR_TEXT = 1
-EXTRACTOR_CSS = 2
+EXTRACTOR_HTML = 2
 EXTRACTOR_BINARY = 3
 
 
@@ -130,8 +130,14 @@ class WebarchivSession:
         else:
             return self._handle_response_errors(r)
     
-    def _post(self, op, auto_connect=True, **kwargs):
-        kwargs['json'] = self._add_api_key_and_token(kwargs.pop('json', {}))
+    def _post(self, op, auto_connect=True, json: dict = None, **kwargs):
+        if not json:
+            json = {}
+        kwargs['json'] = self._add_api_key_and_token(json)
+        kwargs['headers'] = {
+            'content-type': 'application/json',
+            'accept': 'application/ld+json'
+        }
         r = requests.post(self.base_url.format(op), **kwargs)
         if r.ok:
             return r
@@ -141,29 +147,6 @@ class WebarchivSession:
         else:
             return self._handle_response_errors(r)
 
-    def _post(self, op, jsondata, auto_connect=True):
-        r = requests.post(self.base_url.format(op), jsondata,
-                          headers={
-                              'content-type': 'application/json',
-                              'accept': 'application/ld+json'
-                          })
-        if r.ok:
-            return r
-        else:
-            if r.status_code == 403:
-                if auto_connect:
-                    self.connect()
-                    return self._post(op=op, jsondata=jsondata, auto_connect=False)
-                else:
-                    print('Forbidden. Invalid Token or ApiKey transmitted', file=sys.stderr)
-                    return r
-            elif r.status_code == 400:
-                print('Bad request', file=sys.stderr)
-                return r
-            elif r.status_code == 410:
-                print('The requested API Version (via X-API-VERSION Header) is not available', file=sys.stderr)
-            return r
-
     def fulltext_search(self, query_string, from_=None, to_=None):
         """
         Start a fulltext search query in the Webarchive.
@@ -376,17 +359,13 @@ class WebarchivSession:
 
     def fragmentChecksumHtml(self, seed, capture, selector, occurrence):
         try:
-            response = self._post(op='/fragment/checksum/html', jsondata='''{{
-                              "apikey": "{api_key}",
-                              "t": "{token}",
-                              "seed": "{seed}",
-                              "capture": "{capture}",
-                              "selector": "{selector}",
-                              "occurrence": "{occurrence}",
-                              "extractortype": 2
-
-                          }}'''.format(api_key=self.api_key, token=self.token, seed=seed, capture=capture,
-                                       selector=selector, occurrence=occurrence))
+            response = self._post(op='/fragment/checksum/html', json={
+                              "seed": seed,
+                              "capture": capture,
+                              "selector": selector,
+                              "occurrence": occurrence,
+                              "extractortype": EXTRACTOR_HTML
+                          })
             response = self.status_query(response)
             return self.waitForResponse(response)
         except HTTPError as e:
@@ -414,7 +393,7 @@ if __name__ == '__main__':
     for capture in response.json()['hits']:
         capturedate = capture['c']
 
-        resp = w.fragmentChecksumHtml(url, capturedate, ".odd td", 3);
+        resp = w.fragmentChecksumHtml(url, capturedate, ".odd td", 3)
         checksum = resp.json()['checksum']
         returncode = resp.json()['returncode']