diff --git a/pywb/apps/rewriterapp.py b/pywb/apps/rewriterapp.py
index f596b189..60655aaa 100644
--- a/pywb/apps/rewriterapp.py
+++ b/pywb/apps/rewriterapp.py
@@ -175,6 +175,12 @@ class RewriterApp(object):
 
         content_length = (record.http_headers.
                           get_header('Content-Length'))
+
+        if content_length is None:
+            return
+
+        content_length = content_length.split(',')[0]
+
         try:
             content_length = int(content_length)
             if not range_end:
diff --git a/pywb/rewrite/cookie_rewriter.py b/pywb/rewrite/cookie_rewriter.py
index 53dd622c..1cfd8a99 100644
--- a/pywb/rewrite/cookie_rewriter.py
+++ b/pywb/rewrite/cookie_rewriter.py
@@ -26,10 +26,39 @@ class WbUrlBaseCookieRewriter(object):
             morsel = self.rewrite_cookie(name, morsel)
 
             self._filter_morsel(morsel)
-            results.append((header, morsel.OutputString()))
+
+            if not self.add_prefix_cookie_for_all_mods(morsel, results, header):
+                value = morsel.OutputString()
+                results.append((header, value))
 
         return results
 
+    def add_prefix_cookie_for_all_mods(self, morsel, results, header):
+        """  If HttpOnly cookie that is set to a path ending in /,
+             and current mod is mp_ or if_,
+             then assume its meant to be a prefix, and likely needed for
+             other content.
+             Set cookie with same prefix but for all common modifiers:
+             (mp_, js_, cs_, oe_, if_)
+        """
+        curr_mod = self.url_rewriter.wburl.mod
+        if curr_mod not in ('mp_', 'if_'):
+            return False
+
+        if not morsel.get('httponly'):
+            return False
+
+        path = morsel.get('path')
+        if not path or not path.endswith('/'):
+            return False
+
+        for mod in ('mp_', 'cs_', 'js_', 'im_', 'oe_', 'if_'):
+            new_path = path.replace(curr_mod + '/', mod + '/')
+            morsel['path'] = new_path
+            results.append((header, morsel.OutputString()))
+
+        return True
+
     def _filter_morsel(self, morsel):
         path = morsel.get('path')
         if path:
diff --git a/pywb/rewrite/test/test_content_rewriter.py b/pywb/rewrite/test/test_content_rewriter.py
index 60cbd265..385896e0 100644
--- a/pywb/rewrite/test/test_content_rewriter.py
+++ b/pywb/rewrite/test/test_content_rewriter.py
@@ -21,6 +21,7 @@ import os
 import json
 import pytest
 import six
+import re
 
 
 # ============================================================================
@@ -277,6 +278,36 @@ class TestContentRewriter(object):
 
         assert is_rw == False
 
+    def test_rewrite_cookies_all_mods(self):
+        headers = {'Set-Cookie': 'foo=bar; Expires=Wed, 13 Jan 2021 22:23:01 GMT; Path=/some/path/; HttpOnly'}
+        content = '\x11\x12\x13\x14'
+        headers, gen, is_rw = self.rewrite_record(headers, content, ts='201701mp_')
+
+        mods = set()
+        assert len(headers.headers) == 6
+        for name, value in headers.headers:
+            assert name == 'Set-Cookie'
+            mods.add(re.search('Path=/prefix/201701([^/]+)', value).group(1))
+
+        assert mods == {'mp_', 'cs_', 'js_', 'im_', 'oe_', 'if_'}
+        assert is_rw == False
+
+    def test_rewrite_http_cookie_no_all_mods_no_slash(self):
+        headers = {'Set-Cookie': 'foo=bar; Expires=Wed, 13 Jan 2021 22:23:01 GMT; Path=/some/path; HttpOnly'}
+        content = 'abcdefg'
+        headers, gen, is_rw = self.rewrite_record(headers, content, ts='201701mp_')
+
+        assert len(headers.headers) == 1
+        assert headers.headers[0][0] == 'Set-Cookie'
+
+    def test_rewrite_http_cookie_no_all_mods_wrong_mod(self):
+        headers = {'Set-Cookie': 'foo=bar; Expires=Wed, 13 Jan 2021 22:23:01 GMT; Path=/some/path/; HttpOnly'}
+        content = 'abcdefg'
+        headers, gen, is_rw = self.rewrite_record(headers, content, ts='201701id_')
+
+        assert len(headers.headers) == 1
+        assert headers.headers[0][0] == 'Set-Cookie'
+
     def test_binary_no_content_type(self):
         headers = {}
         content = '\x11\x12\x13\x14'
diff --git a/pywb/static/wombat.js b/pywb/static/wombat.js
index 1109ab0a..f6cefc4e 100644
--- a/pywb/static/wombat.js
+++ b/pywb/static/wombat.js
@@ -251,8 +251,8 @@ var _WBWombat = function($wbwindow, wbinfo) {
     //============================================
     var rewrite_url = rewrite_url_;
 
-    function rewrite_url_debug(url, use_rel, mod) {
-        var rewritten = rewrite_url_(url, use_rel, mod);
+    function rewrite_url_debug(url, use_rel, mod, doc) {
+        var rewritten = rewrite_url_(url, use_rel, mod, doc);
         if (url != rewritten) {
             console.log('REWRITE: ' + url + ' -> ' + rewritten);
         } else {
@@ -280,7 +280,7 @@ var _WBWombat = function($wbwindow, wbinfo) {
 
 
     //============================================
-    function rewrite_url_(url, use_rel, mod) {
+    function rewrite_url_(url, use_rel, mod, doc) {
         // If undefined, just return it
         if (!url) {
             return url;
@@ -369,7 +369,7 @@ var _WBWombat = function($wbwindow, wbinfo) {
 
         // Use a parser
         if (url.charAt(0) == ".") {
-            url = resolve_rel_url(url);
+            url = resolve_rel_url(url, doc);
         }
 
         // If full url starting with http://, https:// or //
@@ -1606,7 +1606,7 @@ var _WBWombat = function($wbwindow, wbinfo) {
                 return;
             }
             var mod = rwModForElement(elem, name);
-            new_value = rewrite_url(value, false, mod);
+            new_value = rewrite_url(value, false, mod, elem.ownerDocument);
         }
 
         if (new_value != value) {
diff --git a/pywb/warcserver/resource/responseloader.py b/pywb/warcserver/resource/responseloader.py
index e6470176..6aecbb80 100644
--- a/pywb/warcserver/resource/responseloader.py
+++ b/pywb/warcserver/resource/responseloader.py
@@ -108,7 +108,7 @@ class BaseLoader(object):
         # Try to set content-length, if it is available and valid
         try:
             content_len = int(content_len_str)
-        except (KeyError, TypeError):
+        except (ValueError, TypeError):
             content_len = -1
 
         if content_len >= 0:
diff --git a/tests/test_live_rewriter.py b/tests/test_live_rewriter.py
index 08c6ef71..68d29cb2 100644
--- a/tests/test_live_rewriter.py
+++ b/tests/test_live_rewriter.py
@@ -1,6 +1,7 @@
 from .base_config_test import BaseConfigTest, fmod_sl
 from pywb.warcserver.test.testutils import HttpBinLiveTests
 import pytest
+import sys
 
 
 # ============================================================================
@@ -37,6 +38,26 @@ class TestLiveRewriter(HttpBinLiveTests, BaseConfigTest):
         resp = self.head('/live/{0}httpbin.org/get?foo=bar', fmod_sl)
         assert resp.status_int == 200
 
+    @pytest.mark.skipif(sys.version_info < (3,0), reason='does not respond in 2.7')
+    def test_live_bad_content_length(self, fmod_sl):
+        resp = self.get('/live/{0}httpbin.org/response-headers?content-length=149,149', fmod_sl, status=200)
+        assert resp.headers['Content-Length'] == '149'
+
+        resp = self.get('/live/{0}httpbin.org/response-headers?Content-Length=xyz', fmod_sl, status=200)
+        assert resp.headers['Content-Length'] == '90'
+
+    @pytest.mark.skipif(sys.version_info < (3,0), reason='does not respond in 2.7')
+    def test_live_bad_content_length_with_range(self, fmod_sl):
+        resp = self.get('/live/{0}httpbin.org/response-headers?content-length=149,149', fmod_sl,
+                        headers={'Range': 'bytes=0-'}, status=206)
+        assert resp.headers['Content-Length'] == '149'
+        assert resp.headers['Content-Range'] == 'bytes 0-148/149'
+
+        resp = self.get('/live/{0}httpbin.org/response-headers?Content-Length=xyz', fmod_sl,
+                        headers={'Range': 'bytes=0-'}, status=206)
+        assert resp.headers['Content-Length'] == '90'
+        assert resp.headers['Content-Range'] == 'bytes 0-89/90'
+
     def test_live_live_frame(self):
         resp = self.testapp.get('/live/http://example.com/')
         assert resp.status_int == 200