diff --git a/pywb/rewrite/rewrite_live.py b/pywb/rewrite/rewrite_live.py
index dda6053a..de137ae3 100644
--- a/pywb/rewrite/rewrite_live.py
+++ b/pywb/rewrite/rewrite_live.py
@@ -75,7 +75,8 @@ class LiveRewriter(object):
             else:
                 continue
 
-            headers[name] = value
+            if value:
+                headers[name] = value
 
         return headers
 
diff --git a/pywb/rewrite/test/test_rewrite_live.py b/pywb/rewrite/test/test_rewrite_live.py
index a814b1f4..46318b6c 100644
--- a/pywb/rewrite/test/test_rewrite_live.py
+++ b/pywb/rewrite/test/test_rewrite_live.py
@@ -84,11 +84,14 @@ def test_example_domain_specific_3():
 
 
 def test_post():
-    buff = BytesIO('ABCDEF')
+    buff = BytesIO('ABC=DEF')
 
     env = {'REQUEST_METHOD': 'POST',
-           'HTTP_ORIGIN': 'http://example.com',
-           'HTTP_HOST': 'example.com',
+           'HTTP_ORIGIN': 'http://httpbin.org',
+           'HTTP_HOST': 'httpbin.org',
+           'HTTP_CONNECTION': 'close',
+           'CONTENT_LENGTH': str(len(buff.getvalue())),
+           'CONTENT_TYPE': 'application/x-www-form-urlencoded',
            'wsgi.input': buff}
 
     status_headers, resp_buff = get_rewritten('http://httpbin.org/post', urlrewriter, env=env)