TypeError: sequence item 0: expected str instance, bytes found

[Dirk Stöcker]

When I call following URL ​https://software.rtcm-ntrip.org/changeset/10236/ntrip/trunk/BNC/src/src.pri?format=diff I get the mentioned error message.

This also happens when I deactivate all plugins.

Traceback (most recent call last):
  File "/usr/lib/python3.6/site-packages/trac/web/main.py", line 609, in dispatch_request
    dispatcher.dispatch(req)
  File "/usr/lib/python3.6/site-packages/trac/web/main.py", line 301, in dispatch
    raise e
  File "/usr/lib/python3.6/site-packages/trac/web/main.py", line 247, in dispatch
    resp = chosen_handler.process_request(req)
  File "/usr/lib/python3.6/site-packages/trac/versioncontrol/web_ui/changeset.py", line 343, in process_request
    self._render_diff(req, filename, repos, data)
  File "/usr/lib/python3.6/site-packages/trac/versioncontrol/web_ui/changeset.py", line 689, in _render_diff
    output = ''.join(output)
TypeError: sequence item 0: expected str instance, bytes found

It is fixed by

versioncontrol/web_ui/changeset.py

@@ -686 +686 @@
         if Chrome(self.env).use_chunked_encoding:
             length = None
         else:
-            output = ''.join(output)
+            output = b''.join(output)
             length = len(output)
 
         req.send_response(200)

Similar URLs on a second Trac instance work, so maybe that needs postgres as database to fail?

Applying the change on the working system with sqlite3 database does no harm.

[Jun Omae]

Good catch! That is raised while rendering content as diff format when [trac] use_chunked_encoding is disabled with Trac 1.6. The option is enabled by default since Trac 1.4.

[Jun Omae]

Fixed in [17776] and merged in [17777].