UnicodeDecodeError when loading debug templates.

[chihun-jang]

While studying Django, I had an error where the technical_500.html page was not properly printed.

In the log window, UnicodeDecodeError was continuously printed, and in the template, the sentence 'A server error occured. Please contact the administrator' was printed

So when I checked the technical_500.html file of Django 2.2version, I found that the dotdotdot wrapped by the <span>tag on the 239th line was changed to ellipsis.

Apparently, the version of Django 2.1.8 was a dotdotdot.

So I took steps to change the 239th line's ellipsis to dotdotdot.

Or, when reading the technical_500.html file from inside the debug.py file, the encoding format was set to utf-8.

This enabled me to resolve the error.

Did you intentionally modify the technical_html file?

[Nick Pope]

The issue here is that reading the various debug templates was changed in ​ea542a9 to bypass the template loaders. The template loaders use the encoding specified on the template engine which is utf-8 by default. Later in ​50b8493 an ellipsis was added and this caused things to blow up on Windows as locale.getpreferredencoding(False) is not utf-8.

Here is an alternative ​PR that adds tests and a release note for 2.2.1 as this is a regression.

[Carlton Gibson]

Upgrading to Release Blocker. Thanks for the report!

[Mariusz Felisiak]

Original ticket that describes the same issue #30303.

[Carlton Gibson <carlton.gibson@…>]

In efb257a0:

Fixed #30324 -- Forced utf-8 encoding when loading the template for the technical 500 debug page.

Regression in 50b8493.
Related to ea542a9.

[Carlton Gibson <carlton.gibson@…>]

In 6b4e57d7:

Refs #30324 -- Forced utf-8 encoding when loading templates for the technical 404 debug and congrats page.

[Carlton Gibson <carlton.gibson@…>]

In 9da25fb:

[2.2.x] Fixed #30324 -- Forced utf-8 encoding when loading the template for the technical 500 debug page.

Regression in 50b8493.
Related to ea542a9.

Backport of efb257a01764855a71051d5bcc7fd66c5ad6d210 from master

[zhangplusone]

                <li onclick="toggle('pre{{ frame.id }}', 'post{{ frame.id }}')"><pre>{{ frame.context_line }}</pre>{% if not is_email %} <span>…</span>{% endif %}</li>

On line 239, there is a special characters "…", or you can replace it with "..."