diff --git a/session.py b/session.py
index b3f9129e..5591b19c 100644
--- a/session.py
+++ b/session.py
@@ -92,6 +92,11 @@ def postJsonString(session,postJsonStr: str, \
 
     postResult = session.post(url = inboxUrl, data = postJsonStr, headers=headers)
     if postResult.status_code<200 or postResult.status_code>202:
+        if postResult.status_code==400:
+            headers['content-type']='application/ld+json'
+            postResult = session.post(url = inboxUrl, data = postJsonStr, headers=headers)
+            if not (postResult.status_code<200 or postResult.status_code>202):
+                return True
         if postResult.status_code==401:
             print('WARN: >>> Post to '+inboxUrl+' is unauthorized <<<')
         else: