diff --git a/newsfragments/3565.minor b/newsfragments/3565.minor
new file mode 100644
index 000000000..e69de29bb
diff --git a/src/allmydata/storage_client.py b/src/allmydata/storage_client.py
index 294a2d215..eb1572dcb 100644
--- a/src/allmydata/storage_client.py
+++ b/src/allmydata/storage_client.py
@@ -464,6 +464,7 @@ class StorageFarmBroker(service.MultiService):
 @implementer(IDisplayableServer)
 class StubServer(object):
     def __init__(self, serverid):
+        assert isinstance(serverid, bytes)
         self.serverid = serverid # binary tubid
     def get_serverid(self):
         return self.serverid
diff --git a/src/allmydata/test/test_json_metadata.py b/src/allmydata/test/test_json_metadata.py
index 75d4e1567..a0cb9c142 100644
--- a/src/allmydata/test/test_json_metadata.py
+++ b/src/allmydata/test/test_json_metadata.py
@@ -1,3 +1,14 @@
+"""
+Ported to Python 3.
+"""
+from __future__ import absolute_import
+from __future__ import division
+from __future__ import print_function
+from __future__ import unicode_literals
+
+from future.utils import PY2
+if PY2:
+    from future.builtins import filter, map, zip, ascii, chr, hex, input, next, oct, open, pow, round, super, bytes, dict, list, object, range, str, max, min  # noqa: F401
 
 from twisted.trial.unittest import TestCase
 
diff --git a/src/allmydata/test/web/test_common.py b/src/allmydata/test/web/test_common.py
index 5261c412f..84ab5cab2 100644
--- a/src/allmydata/test/web/test_common.py
+++ b/src/allmydata/test/web/test_common.py
@@ -1,6 +1,16 @@
 """
 Tests for ``allmydata.web.common``.
+
+Ported to Python 3.
 """
+from __future__ import absolute_import
+from __future__ import division
+from __future__ import print_function
+from __future__ import unicode_literals
+
+from future.utils import PY2
+if PY2:
+    from future.builtins import filter, map, zip, ascii, chr, hex, input, next, oct, open, pow, round, super, bytes, dict, list, object, range, str, max, min  # noqa: F401
 
 import gc
 
@@ -163,7 +173,7 @@ class RenderExceptionTests(SyncTestCase):
                         BeautifulSoup(value, 'html5lib'),
                         "meta",
                         {"http-equiv": "refresh",
-                         "content": "0;URL={}".format(loc.encode("ascii")),
+                         "content": "0;URL={}".format(loc),
                         },
                     )
                     # The assertion will raise if it has a problem, otherwise
diff --git a/src/allmydata/test/web/test_status.py b/src/allmydata/test/web/test_status.py
index 5685a3938..414925446 100644
--- a/src/allmydata/test/web/test_status.py
+++ b/src/allmydata/test/web/test_status.py
@@ -1,6 +1,16 @@
 """
 Tests for ```allmydata.web.status```.
+
+Ported to Python 3.
 """
+from __future__ import absolute_import
+from __future__ import division
+from __future__ import print_function
+from __future__ import unicode_literals
+
+from future.utils import PY2
+if PY2:
+    from future.builtins import filter, map, zip, ascii, chr, hex, input, next, oct, open, pow, round, super, bytes, dict, list, object, range, str, max, min  # noqa: F401
 
 from bs4 import BeautifulSoup
 from twisted.web.template import flattenString
@@ -143,12 +153,12 @@ class DownloadStatusElementTests(TrialTestCase):
         See if we can render the page almost fully.
         """
         status = FakeDownloadStatus(
-            "si-1", 123,
-            ["s-1", "s-2", "s-3"],
-            {"s-1": "unknown problem"},
-            {"s-1": [1], "s-2": [1,2], "s-3": [2,3]},
+            b"si-1", 123,
+            [b"s-1", b"s-2", b"s-3"],
+            {b"s-1": "unknown problem"},
+            {b"s-1": [1], b"s-2": [1,2], b"s-3": [2,3]},
             {"fetch_per_server":
-             {"s-1": [1], "s-2": [2,3], "s-3": [3,2]}}
+             {b"s-1": [1], b"s-2": [2,3], b"s-3": [3,2]}}
         )
 
         result = self._render_download_status_element(status)
diff --git a/src/allmydata/test/web/test_util.py b/src/allmydata/test/web/test_util.py
index 24f865ebc..5f4d6bb88 100644
--- a/src/allmydata/test/web/test_util.py
+++ b/src/allmydata/test/web/test_util.py
@@ -1,3 +1,15 @@
+"""
+Ported to Python 3.
+"""
+from __future__ import absolute_import
+from __future__ import division
+from __future__ import print_function
+from __future__ import unicode_literals
+
+from future.utils import PY2
+if PY2:
+    from future.builtins import filter, map, zip, ascii, chr, hex, input, next, oct, open, pow, round, super, bytes, dict, list, object, range, str, max, min  # noqa: F401
+
 from twisted.trial import unittest
 from allmydata.web import status, common
 from ..common import ShouldFailMixin
diff --git a/src/allmydata/test/web/test_web.py b/src/allmydata/test/web/test_web.py
index 326569a26..1908afdeb 100644
--- a/src/allmydata/test/web/test_web.py
+++ b/src/allmydata/test/web/test_web.py
@@ -90,7 +90,7 @@ class FakeNodeMaker(NodeMaker):
         return FakeMutableFileNode(None, None,
                                    self.encoding_params, None,
                                    self.all_contents).init_from_cap(cap)
-    def create_mutable_file(self, contents="", keysize=None,
+    def create_mutable_file(self, contents=b"", keysize=None,
                             version=SDMF_VERSION):
         n = FakeMutableFileNode(None, None, self.encoding_params, None,
                                 self.all_contents)
@@ -105,7 +105,7 @@ class FakeUploader(service.Service):
         d = uploadable.get_size()
         d.addCallback(lambda size: uploadable.read(size))
         def _got_data(datav):
-            data = "".join(datav)
+            data = b"".join(datav)
             n = create_chk_filenode(data, self.all_contents)
             ur = upload.UploadResults(file_size=len(data),
                                       ciphertext_fetched=0,
@@ -127,12 +127,12 @@ class FakeUploader(service.Service):
 
 
 def build_one_ds():
-    ds = DownloadStatus("storage_index", 1234)
+    ds = DownloadStatus(b"storage_index", 1234)
     now = time.time()
 
-    serverA = StubServer(hashutil.tagged_hash("foo", "serverid_a")[:20])
-    serverB = StubServer(hashutil.tagged_hash("foo", "serverid_b")[:20])
-    storage_index = hashutil.storage_index_hash("SI")
+    serverA = StubServer(hashutil.tagged_hash(b"foo", b"serverid_a")[:20])
+    serverB = StubServer(hashutil.tagged_hash(b"foo", b"serverid_b")[:20])
+    storage_index = hashutil.storage_index_hash(b"SI")
     e0 = ds.add_segment_request(0, now)
     e0.activate(now+0.5)
     e0.deliver(now+1, 0, 100, 0.5) # when, start,len, decodetime
@@ -261,7 +261,7 @@ class FakeClient(_Client):
         # minimal subset
         service.MultiService.__init__(self)
         self.all_contents = {}
-        self.nodeid = "fake_nodeid"
+        self.nodeid = b"fake_nodeid"
         self.nickname = u"fake_nickname \u263A"
         self.introducer_furls = []
         self.introducer_clients = []
@@ -277,7 +277,7 @@ class FakeClient(_Client):
         # fake knowledge of another server
         self.storage_broker.test_add_server("other_nodeid",
             FakeDisplayableServer(
-                serverid="other_nodeid", nickname=u"other_nickname \u263B", connected = True,
+                serverid=b"other_nodeid", nickname=u"other_nickname \u263B", connected = True,
                 last_connect_time = 10, last_loss_time = 20, last_rx_time = 30))
         self.storage_broker.test_add_server("disconnected_nodeid",
             FakeDisplayableServer(
diff --git a/src/allmydata/util/_python3.py b/src/allmydata/util/_python3.py
index c29217912..af771cd5a 100644
--- a/src/allmydata/util/_python3.py
+++ b/src/allmydata/util/_python3.py
@@ -154,6 +154,7 @@ PORTED_TEST_MODULES = [
     "allmydata.test.test_immutable",
     "allmydata.test.test_introducer",
     "allmydata.test.test_iputil",
+    "allmydata.test.test_json_metadata",
     "allmydata.test.test_log",
     "allmydata.test.test_monitor",
     "allmydata.test.test_netstring",
@@ -178,4 +179,7 @@ PORTED_TEST_MODULES = [
     "allmydata.test.test_upload",
     "allmydata.test.test_uri",
     "allmydata.test.test_util",
+    "allmydata.test.web.test_common",
+    "allmydata.test.web.test_util",
+    "allmydata.test.web.test_status",
 ]
diff --git a/src/allmydata/web/common.py b/src/allmydata/web/common.py
index d970cc918..929db4f6e 100644
--- a/src/allmydata/web/common.py
+++ b/src/allmydata/web/common.py
@@ -208,28 +208,44 @@ def compute_rate(bytes, seconds):
     return 1.0 * bytes / seconds
 
 def abbreviate_rate(data):
-    # 21.8kBps, 554.4kBps 4.37MBps
+    """
+    Convert number of bytes/second into human readable strings (unicode).
+
+    Uses metric measures, so 1000 not 1024, e.g. 21.8kBps, 554.4kBps, 4.37MBps.
+
+    :param data: Either ``None`` or integer.
+
+    :return: Unicode string.
+    """
     if data is None:
-        return ""
+        return u""
     r = float(data)
     if r > 1000000:
-        return "%1.2fMBps" % (r/1000000)
+        return u"%1.2fMBps" % (r/1000000)
     if r > 1000:
-        return "%.1fkBps" % (r/1000)
-    return "%.0fBps" % r
+        return u"%.1fkBps" % (r/1000)
+    return u"%.0fBps" % r
 
 def abbreviate_size(data):
-    # 21.8kB, 554.4kB 4.37MB
+    """
+    Convert number of bytes into human readable strings (unicode).
+
+    Uses metric measures, so 1000 not 1024, e.g. 21.8kB, 554.4kB, 4.37MB.
+
+    :param data: Either ``None`` or integer.
+
+    :return: Unicode string.
+    """
     if data is None:
-        return ""
+        return u""
     r = float(data)
     if r > 1000000000:
-        return "%1.2fGB" % (r/1000000000)
+        return u"%1.2fGB" % (r/1000000000)
     if r > 1000000:
-        return "%1.2fMB" % (r/1000000)
+        return u"%1.2fMB" % (r/1000000)
     if r > 1000:
-        return "%.1fkB" % (r/1000)
-    return "%.0fB" % r
+        return u"%.1fkB" % (r/1000)
+    return u"%.0fB" % r
 
 def plural(sequence_or_length):
     if isinstance(sequence_or_length, int):
@@ -562,7 +578,7 @@ def _finish(result, render, request):
         Message.log(
             message_type=u"allmydata:web:common-render:DecodedURL",
         )
-        _finish(redirectTo(str(result), request), render, request)
+        _finish(redirectTo(result.to_text().encode("utf-8"), request), render, request)
     elif result is None:
         Message.log(
             message_type=u"allmydata:web:common-render:None",
diff --git a/src/allmydata/web/common_py3.py b/src/allmydata/web/common_py3.py
index 22f235790..41b6939f3 100644
--- a/src/allmydata/web/common_py3.py
+++ b/src/allmydata/web/common_py3.py
@@ -95,16 +95,23 @@ class MultiFormatResource(resource.Resource, object):
 
 
 def abbreviate_time(data):
+    """
+    Convert number of seconds into human readable string.
+
+    :param data: Either ``None`` or integer or float, seconds.
+
+    :return: Unicode string.
+    """
     # 1.23s, 790ms, 132us
     if data is None:
-        return ""
+        return u""
     s = float(data)
     if s >= 10:
         return abbreviate.abbreviate_time(data)
     if s >= 1.0:
-        return "%.2fs" % s
+        return u"%.2fs" % s
     if s >= 0.01:
-        return "%.0fms" % (1000*s)
+        return u"%.0fms" % (1000*s)
     if s >= 0.001:
-        return "%.1fms" % (1000*s)
-    return "%.0fus" % (1000000*s)
+        return u"%.1fms" % (1000*s)
+    return u"%.0fus" % (1000000*s)
diff --git a/src/allmydata/web/status.py b/src/allmydata/web/status.py
index ec55b73eb..3284dfda6 100644
--- a/src/allmydata/web/status.py
+++ b/src/allmydata/web/status.py
@@ -1,3 +1,4 @@
+from past.builtins import long, unicode
 
 import pprint
 import itertools
@@ -1297,6 +1298,7 @@ class Status(MultiFormatResource):
         except ValueError:
             raise WebError("no '-' in '{}'".format(path))
         count = int(count_s)
+        stype = unicode(stype, "ascii")
         if stype == "up":
             for s in itertools.chain(h.list_all_upload_statuses(),
                                      h.list_all_helper_statuses()):
@@ -1335,7 +1337,7 @@ class Status(MultiFormatResource):
         active = [s
                   for s in self._get_all_statuses()
                   if s.get_active()]
-        active.sort(lambda a, b: cmp(a.get_started(), b.get_started()))
+        active.sort(key=lambda a: a.get_started())
         active.reverse()
         return active
 
@@ -1343,7 +1345,7 @@ class Status(MultiFormatResource):
         recent = [s
                   for s in self._get_all_statuses()
                   if not s.get_active()]
-        recent.sort(lambda a, b: cmp(a.get_started(), b.get_started()))
+        recent.sort(key=lambda a: a.get_started())
         recent.reverse()
         return recent
 
@@ -1373,7 +1375,6 @@ class StatusElement(Element):
 
         started_s = render_time(op.get_started())
         result["started"] = started_s
-
         si_s = base32.b2a_or_none(op.get_storage_index())
         if si_s is None:
             si_s = "(None)"