diff --git a/CHANGES.rst b/CHANGES.rst
index 1ddaeea2..0fe9ae07 100644
--- a/CHANGES.rst
+++ b/CHANGES.rst
@@ -1,3 +1,20 @@
+pywb 0.6.5 changelist
+~~~~~~~~~~~~~~~~~~~~~
+
+* fix static handling when content type can not be guessed, default to 'application/octet-stream'
+
+* rewrite fix: understand partially encoded urls such as http%3A// in WbUrl, decode correctly
+
+* rewrite fix: rewrite \/\/example.com and \\/\\/example.com in JS same as \\example.com
+
+* cookies: add exact cookie rewriter which sets cookie to exact url only, never collection or host root
+
+* don't rewrite rel=canonical links for services which rely on these
+
+* cdx-indexer: Detect non-gzip chunk encoded .warc.gz/arc.gz archive files and show a meaningful
+  error message explaining how to fix issue (uncompress and possibly use warctools warc2warc to recompress)
+
+
 pywb 0.6.4 changelist
 ~~~~~~~~~~~~~~~~~~~~~
 
diff --git a/README.rst b/README.rst
index 6a913b78..5150c8f8 100644
--- a/README.rst
+++ b/README.rst
@@ -1,4 +1,4 @@
-PyWb 0.6.4
+PyWb 0.6.5
 ==========
 
 .. image:: https://travis-ci.org/ikreymer/pywb.png?branch=master
diff --git a/pywb/framework/wbrequestresponse.py b/pywb/framework/wbrequestresponse.py
index 808563ea..06970316 100644
--- a/pywb/framework/wbrequestresponse.py
+++ b/pywb/framework/wbrequestresponse.py
@@ -131,7 +131,7 @@ class WbRequest(object):
         if not self.wb_url:
             return
 
-        mime = self.env.get('CONTENT_TYPE').split(';')[0]
+        mime = self.env.get('CONTENT_TYPE', '').split(';')[0]
         length = self.env.get('CONTENT_LENGTH')
         stream = self.env['wsgi.input']
 
diff --git a/pywb/rewrite/cookie_rewriter.py b/pywb/rewrite/cookie_rewriter.py
index 4724df4c..e9dd80ac 100644
--- a/pywb/rewrite/cookie_rewriter.py
+++ b/pywb/rewrite/cookie_rewriter.py
@@ -55,6 +55,24 @@ class MinimalScopeCookieRewriter(WbUrlBaseCookieRewriter):
         return morsel
 
 
+#=================================================================
+class ExactPathCookieRewriter(WbUrlBaseCookieRewriter):
+    """
+    Rewrite cookies only using exact path, useful for live rewrite
+    without a timestamp and to minimize cookie pollution
+
+    If path or domain present, simply remove
+    """
+
+    def rewrite_cookie(self, name, morsel):
+        if morsel.get('domain'):
+            del morsel['domain']
+        # else set cookie to rewritten path
+        if morsel.get('path'):
+            del morsel['path']
+
+        self._remove_age_opts(morsel)
+        return morsel
 #=================================================================
 class RootScopeCookieRewriter(WbUrlBaseCookieRewriter):
     """
@@ -79,5 +97,7 @@ class RootScopeCookieRewriter(WbUrlBaseCookieRewriter):
 def get_cookie_rewriter(cookie_scope):
     if cookie_scope == 'root':
         return RootScopeCookieRewriter
+    elif cookie_scope == 'exact':
+        return ExactPathCookieRewriter
     else:
         return MinimalScopeCookieRewriter
diff --git a/pywb/rewrite/html_rewriter.py b/pywb/rewrite/html_rewriter.py
index f0c904c2..618c5191 100644
--- a/pywb/rewrite/html_rewriter.py
+++ b/pywb/rewrite/html_rewriter.py
@@ -174,6 +174,12 @@ class HTMLRewriterMixin(object):
             elif attr_name == 'crossorigin':
                 attr_name = '_crossorigin'
 
+            # special case: link don't rewrite canonical
+            elif tag == 'link' and attr_name == 'href':
+                if not self.has_attr(tag_attrs, ('rel', 'canonical')):
+                    rw_mod = handler.get(attr_name)
+                    attr_value = self._rewrite_url(attr_value, rw_mod)
+
             # special case: meta tag
             elif (tag == 'meta') and (attr_name == 'content'):
                 if self.has_attr(tag_attrs, ('http-equiv', 'refresh')):
diff --git a/pywb/rewrite/test/test_cookie_rewriter.py b/pywb/rewrite/test/test_cookie_rewriter.py
index c20f56f9..4f57464f 100644
--- a/pywb/rewrite/test/test_cookie_rewriter.py
+++ b/pywb/rewrite/test/test_cookie_rewriter.py
@@ -1,4 +1,5 @@
 r"""
+# Default -- MinimalScopeRewriter
 # No rewriting
 >>> rewrite_cookie('a=b; c=d;')
 [('Set-Cookie', 'a=b'), ('Set-Cookie', 'c=d')]
@@ -23,10 +24,17 @@ r"""
 >>> rewrite_cookie('abc@def=123')
 []
 
+# ExactCookieRewriter
+>>> rewrite_cookie('some=value; Path=/diff/path/;', urlrewriter, ExactPathCookieRewriter)
+[('Set-Cookie', 'some=value')]
+
+>>> rewrite_cookie('some=value; Domain=.example.com; Path=/diff/path/; Max-Age=1500', urlrewriter, ExactPathCookieRewriter)
+[('Set-Cookie', 'some=value')]
+
 """
 
 
-from pywb.rewrite.cookie_rewriter import MinimalScopeCookieRewriter
+from pywb.rewrite.cookie_rewriter import MinimalScopeCookieRewriter, ExactPathCookieRewriter
 from pywb.rewrite.url_rewriter import UrlRewriter
 
 urlrewriter = UrlRewriter('20131226101010/http://example.com/some/path/index.html', '/pywb/')
@@ -34,6 +42,6 @@ urlrewriter = UrlRewriter('20131226101010/http://example.com/some/path/index.htm
 urlrewriter2 = UrlRewriter('em_/http://example.com/', '/preview/')
 
 
-def rewrite_cookie(cookie_str, rewriter=urlrewriter):
-    return MinimalScopeCookieRewriter(rewriter).rewrite(cookie_str)
+def rewrite_cookie(cookie_str, rewriter=urlrewriter, cookie_rewriter=MinimalScopeCookieRewriter):
+    return cookie_rewriter(rewriter).rewrite(cookie_str)
 
diff --git a/pywb/rewrite/test/test_html_rewriter.py b/pywb/rewrite/test/test_html_rewriter.py
index 45df4dfb..710fa338 100644
--- a/pywb/rewrite/test/test_html_rewriter.py
+++ b/pywb/rewrite/test/test_html_rewriter.py
@@ -102,6 +102,10 @@ ur"""
 >>> parse('<link href="abc.txt"><div>SomeTest</div>', head_insert = '<script>load_stuff();</script>')
 <link href="/web/20131226101010oe_/http://example.com/some/path/abc.txt"><script>load_stuff();</script><div>SomeTest</div>
 
+# don't rewrite rel=canonical
+>>> parse('<link rel=canonical href="http://example.com/">')
+<link rel="canonical" href="http://example.com/">
+
 # doctype
 >>> parse('<!doctype html PUBLIC "public">')
 <!doctype html PUBLIC "public">
diff --git a/pywb/rewrite/test/test_regex_rewriters.py b/pywb/rewrite/test/test_regex_rewriters.py
index 253328e5..92975a7f 100644
--- a/pywb/rewrite/test/test_regex_rewriters.py
+++ b/pywb/rewrite/test/test_regex_rewriters.py
@@ -45,6 +45,16 @@ r"""
 >>> _test_js('document_domain = "anotherdomain.com"; window.document.domain = "example.com"')
 'document_domain = "anotherdomain.com"; window.document.WB_wombat_domain = "example.com"'
 
+# protocol-rel escapes
+>>> _test_js('"//example.com/"')
+'"/web/20131010/http://example.com/"'
+
+>>> _test_js(r'"\/\/example.com/"')
+'"/web/20131010/http:\\/\\/example.com/"'
+
+>>> _test_js(r'"\\/\\/example.com/"')
+'"/web/20131010/http:\\\\/\\\\/example.com/"'
+
 # custom rules added
 >>> _test_js('window.location = "http://example.com/abc.html"; some_func(); ', [('some_func\(\).*', RegexRewriter.format('/*{0}*/'), 0)])
 'window.WB_wombat_location = "/web/20131010/http://example.com/abc.html"; /*some_func(); */'
diff --git a/pywb/rewrite/test/test_url_rewriter.py b/pywb/rewrite/test/test_url_rewriter.py
index be0ca7da..3d324069 100644
--- a/pywb/rewrite/test/test_url_rewriter.py
+++ b/pywb/rewrite/test/test_url_rewriter.py
@@ -50,6 +50,21 @@
 >>> do_rewrite(r'http:\/\/some-other-site.com', '20101226101112/http://example.com/index.html', 'localhost:8080/')
 'localhost:8080/20101226101112/http:\\\\/\\\\/some-other-site.com'
 
+>>> do_rewrite(r'//some-other-site.com', '20101226101112/http://example.com/index.html', 'localhost:8080/')
+'localhost:8080/20101226101112/http://some-other-site.com'
+
+>>> do_rewrite(r'\/\/some-other-site.com', '20101226101112/http://example.com/index.html', 'localhost:8080/')
+'localhost:8080/20101226101112/http:\\\\/\\\\/some-other-site.com'
+
+>>> do_rewrite(r'\\/\\/some-other-site.com', '20101226101112/http://example.com/index.html', 'localhost:8080/')
+'localhost:8080/20101226101112/http:\\\\/\\\\/some-other-site.com'
+
+>>> do_rewrite(r'http:\/\/some-other-site.com', '20101226101112/http://example.com/index.html', 'localhost:8080/')
+'localhost:8080/20101226101112/http:\\\\/\\\\/some-other-site.com'
+
+>>> do_rewrite(r'http:\/\/some-other-site.com', '20101226101112/http://example.com/index.html', 'localhost:8080/')
+'localhost:8080/20101226101112/http:\\\\/\\\\/some-other-site.com'
+
 >>> do_rewrite('../../other.html', '2020/http://example.com/index.html', '/')
 '/2020/http://example.com/other.html'
 
diff --git a/pywb/rewrite/test/test_wburl.py b/pywb/rewrite/test/test_wburl.py
index bcad948e..b4d15b5d 100644
--- a/pywb/rewrite/test/test_wburl.py
+++ b/pywb/rewrite/test/test_wburl.py
@@ -26,6 +26,13 @@
 >>> repr(WbUrl('https://example.com/xyz?a=%2f&b=%2E'))
 "('latest_replay', '', '', 'https://example.com/xyz?a=%2f&b=%2E', 'https://example.com/xyz?a=%2f&b=%2E')"
 
+# Test scheme partially encoded urls
+>>> repr(WbUrl('https%3A//example.com/'))
+"('latest_replay', '', '', 'https://example.com/', 'https://example.com/')"
+
+>>> repr(WbUrl('2014/http%3A%2F%2Fexample.com/'))
+"('replay', '2014', '', 'http://example.com/', '2014/http://example.com/')"
+
 # Query Urls
 # ======================
 >>> repr(WbUrl('*/http://example.com/abc?def=a'))
@@ -57,6 +64,21 @@
 >>> repr(WbUrl('/example.com/'))
 "('latest_replay', '', '', 'http://example.com/', 'http://example.com/')"
 
+# Is_ Tests
+>>> u = WbUrl('*/http://example.com/abc?def=a*')
+>>> u.is_url_query()
+True
+
+>>> u.is_query()
+True
+
+>>> u2 = WbUrl('20130102im_/https:/example.com')
+>>> u2.is_embed
+True
+
+>>> u2.is_replay()
+True
+
 
 # Error Urls
 # ======================
diff --git a/pywb/rewrite/url_rewriter.py b/pywb/rewrite/url_rewriter.py
index 61a48e50..aa87260c 100644
--- a/pywb/rewrite/url_rewriter.py
+++ b/pywb/rewrite/url_rewriter.py
@@ -17,7 +17,9 @@ class UrlRewriter(object):
 
     PROTOCOLS = ['http:', 'https:', 'ftp:', 'mms:', 'rtsp:', 'wais:']
 
-    def __init__(self, wburl, prefix, full_prefix=None, rel_prefix=None, 
+    REL_SCHEME = ('//', r'\/\/', r'\\/\\/')
+
+    def __init__(self, wburl, prefix, full_prefix=None, rel_prefix=None,
                  root_path=None, cookie_scope=None):
         self.wburl = wburl if isinstance(wburl, WbUrl) else WbUrl(wburl)
         self.prefix = prefix
@@ -45,7 +47,7 @@ class UrlRewriter(object):
 
         is_abs = any(url.startswith(x) for x in self.PROTOCOLS)
 
-        if url.startswith('//'):
+        if url.startswith(self.REL_SCHEME):
             is_abs = True
             url = 'http:' + url
 
diff --git a/pywb/rewrite/wburl.py b/pywb/rewrite/wburl.py
index 91d36455..5421a1de 100644
--- a/pywb/rewrite/wburl.py
+++ b/pywb/rewrite/wburl.py
@@ -85,6 +85,9 @@ class WbUrl(BaseWbUrl):
     REPLAY_REGEX = re.compile('^(\d*)([a-z]+_)?/{0,3}(.+)$')
 
     DEFAULT_SCHEME = 'http://'
+
+    PARTIAL_ENC_RX = re.compile('(https?%3A)?(%2F%2F)?', re.I)
+
     # ======================
 
     def __init__(self, url):
@@ -99,6 +102,14 @@ class WbUrl(BaseWbUrl):
         # protocol agnostic url -> http://
         # no protocol -> http://
         inx = self.url.find(':/')
+        if inx < 0:
+            # check for other partially encoded variants
+            m = self.PARTIAL_ENC_RX.match(self.url)
+            if m:
+                len_ = len(m.group(0))
+                self.url = urllib.unquote_plus(self.url[:len_]) + self.url[len_:]
+                inx = self.url.find(':/')
+
         if inx < 0:
             self.url = self.DEFAULT_SCHEME + self.url
         else:
diff --git a/pywb/warc/archiveiterator.py b/pywb/warc/archiveiterator.py
index e1408432..e0994a7f 100644
--- a/pywb/warc/archiveiterator.py
+++ b/pywb/warc/archiveiterator.py
@@ -21,6 +21,25 @@ class ArchiveIterator(object):
 
     """
 
+    GZIP_ERR_MSG = """
+    ERROR: Non-chunked gzip file detected, gzip block continues
+    beyond single record.
+
+    This file is probably not a multi-chunk gzip but a single gzip file.
+
+    To allow seek, a gzipped {1} must have each record compressed into
+    a single gzip chunk and concatenated together.
+
+    This file is likely still valid and you can use it by decompressing it:
+
+    gunzip myfile.{0}.gz
+
+    You can then also use the 'warc2warc' tool from the 'warc-tools'
+    package which will create a properly chunked gzip file:
+
+    warc2warc -Z myfile.{0} > myfile.{0}.gz
+    """
+
     def __init__(self, fileobj):
         self.fh = fileobj
 
@@ -42,27 +61,34 @@ class ArchiveIterator(object):
                                                   block_size=block_size)
         self.offset = self.fh.tell()
 
-        next_line = None
+        self.next_line = None
+
+        is_valid = True
 
         while True:
             try:
-                record = self._next_record(next_line)
+                record = self._next_record(self.next_line)
+                if not is_valid:
+                    self._raise_err()
+
                 yield record
             except EOFError:
                 break
 
             self.read_to_end(record)
 
-            # for non-compressed, consume blank lines here
-            if not self.reader.decompressor:
-                next_line = self._consume_blanklines()
-                if next_line is None:
-                    # at end of file
-                    break
+            if self.reader.decompressor:
+                is_valid = self.reader.read_next_member()
 
-            # reset reader for next member
-            else:
-                self.reader.read_next_member()
+    def _raise_err(self):
+        frmt = 'warc/arc'
+        if self.known_format:
+            frmt = self.known_format
+
+        frmt_up = frmt.upper()
+
+        msg = self.GZIP_ERR_MSG.format(frmt, frmt_up)
+        raise Exception(msg)
 
     def _consume_blanklines(self):
         """ Consume blank lines that are between records
@@ -72,25 +98,31 @@ class ArchiveIterator(object):
           and are included in record length which is the full gzip envelope
         - For uncompressed, they are between records and so are NOT part of
           the record length
+
+          count empty_size so that it can be substracted from
+          the record length for uncompressed
         """
+        empty_size = 0
         while True:
             line = self.reader.readline()
             if len(line) == 0:
-                return None
+                return None, empty_size
 
             if line.rstrip() == '':
-                self.offset = self.fh.tell() - self.reader.rem_length()
+                empty_size += len(line)
                 continue
 
-            return line
+            return line, empty_size
 
     def read_to_end(self, record, compute_digest=False):
         """ Read remainder of the stream
         If a digester is included, update it
         with the data read
         """
+
+        # already at end of this record, don't read until it is consumed
         if self.member_info:
-            return self.member_info
+            return None
 
         if compute_digest:
             digester = hashlib.sha1()
@@ -114,19 +146,29 @@ class ArchiveIterator(object):
         - For uncompressed files, blank lines are read later,
           and not included in the record length
         """
-        if self.reader.decompressor:
-            self._consume_blanklines()
+        #if self.reader.decompressor:
+        self.next_line, empty_size = self._consume_blanklines()
 
         self.offset = self.fh.tell() - self.reader.rem_length()
+        #if self.offset < 0:
+        #    raise Exception('Not Gzipped Properly')
+
+        if self.next_line:
+            self.offset -= len(self.next_line)
+
         length = self.offset - curr_offset
 
+        if not self.reader.decompressor:
+            length -= empty_size
+
         if compute_digest:
             digest = base64.b32encode(digester.digest())
         else:
             digest = None
 
         self.member_info = (curr_offset, length, digest)
-        return self.member_info
+        #return self.member_info
+        #return next_line
 
     def _next_record(self, next_line):
         """ Use loader to parse the record from the reader stream
@@ -250,7 +292,9 @@ def create_record_iter(arcv_iter, options):
 
             entry.post_query = post_query
 
-        entry.set_rec_info(*arcv_iter.read_to_end(record, compute_digest))
+        #entry.set_rec_info(*arcv_iter.read_to_end(record, compute_digest))
+        arcv_iter.read_to_end(record, compute_digest)
+        entry.set_rec_info(*arcv_iter.member_info)
         entry.record = record
 
         yield entry
diff --git a/pywb/warc/test/test_indexing.py b/pywb/warc/test/test_indexing.py
index cb8dc4bb..c8584c8d 100644
--- a/pywb/warc/test/test_indexing.py
+++ b/pywb/warc/test/test_indexing.py
@@ -144,7 +144,6 @@ Total: 4
 
 from pywb import get_test_dir
 
-#from pywb.warc.archiveindexer import ArchiveIndexer, main, cdx_filename
 from pywb.warc.cdxindexer import write_cdx_index, main, cdx_filename
 
 from io import BytesIO
@@ -154,6 +153,9 @@ import os
 import shutil
 import tempfile
 
+from pytest import raises
+
+
 TEST_CDX_DIR = get_test_dir() + 'cdx/'
 TEST_WARC_DIR = get_test_dir() + 'warcs/'
 
@@ -231,3 +233,11 @@ def cli_lines_with_dir(input_):
     print('Total: ' + str(len(lines)))
 
 
+def test_non_chunked_gzip_err():
+    with raises(Exception):
+        print_cdx_index('example-bad.warc.gz.bad')
+
+
+if __name__ == "__main__":
+    import doctest
+    doctest.testmod()
diff --git a/pywb/webapp/handlers.py b/pywb/webapp/handlers.py
index 2c7962cc..a77f7060 100644
--- a/pywb/webapp/handlers.py
+++ b/pywb/webapp/handlers.py
@@ -40,7 +40,7 @@ class SearchPageWbUrlHandler(WbUrlHandler):
                                       create_template(html, 'Frame Insert'))
 
             self.banner_html = config.get('banner_html', 'banner.html')
-            
+
             if config.get('enable_memento', False):
                 self.response_class = MementoResponse
 
@@ -193,7 +193,11 @@ class StaticHandler(BaseHandler):
             else:
                 reader = iter(lambda: data.read(), '')
 
-            content_type, _ = mimetypes.guess_type(full_path)
+            content_type = 'application/octet-stream'
+
+            guessed = mimetypes.guess_type(full_path)
+            if guessed[0]:
+                content_type = guessed[0]
 
             return WbResponse.text_stream(data,
                                           content_type=content_type,
diff --git a/sample_archive/warcs/example-bad.warc.gz.bad b/sample_archive/warcs/example-bad.warc.gz.bad
new file mode 100644
index 00000000..95d2c415
Binary files /dev/null and b/sample_archive/warcs/example-bad.warc.gz.bad differ
diff --git a/setup.py b/setup.py
index 12225bee..b5ef2d26 100755
--- a/setup.py
+++ b/setup.py
@@ -34,7 +34,7 @@ class PyTest(TestCommand):
 
 setup(
     name='pywb',
-    version='0.6.4',
+    version='0.6.5',
     url='https://github.com/ikreymer/pywb',
     author='Ilya Kreymer',
     author_email='ikreymer@gmail.com',