diff --git a/jira/utils.py b/jira/utils.py
index 2344a1cd7..0cbf74d08 100644
--- a/jira/utils.py
+++ b/jira/utils.py
@@ -148,17 +148,17 @@ def __str__(self):
         if self.url:
             t += "\n\turl: %s" % self.url
 
-        if self.request and hasattr(self.request, 'headers'):
-            t += "\n\trequest headers = " % self.request.headers
+        if self.request is not None and hasattr(self.request, 'headers'):
+            t += "\n\trequest headers = %s" % self.request.headers
 
-        if self.request and hasattr(self.request, 'text'):
-            t += "\n\trequest text = " % self.request.text
+        if self.request is not None and hasattr(self.request, 'text'):
+            t += "\n\trequest text = %s" % self.request.text
 
-        if self.response and hasattr(self.response, 'headers'):
-            t += "\n\tresponse headers = " % self.response.headers
+        if self.response is not None and hasattr(self.response, 'headers'):
+            t += "\n\tresponse headers = %s" % self.response.headers
 
-        if self.response and hasattr(self.response, 'text'):
-            t += "\n\tresponse text = " % self.response.headers
+        if self.response is not None and hasattr(self.response, 'text'):
+            t += "\n\tresponse text = %s" % self.response.text
 
         t += '\n'
         return t