Update: We have adjusted some server rules and it may have resolved the
issue.

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https://bugs.launchpad.net/bugs/1819508

Title:
  Processing hang occurs when saving content contains certain HTML tags

Status in Mahara:
  New

Bug description:
  version = 2017092609;
  series = '17.10';
  release = '17.10.1';
  minupgradefrom = 2015030409;
  minupgraderelease = '15.04.0 (release tag 15.04.0_RELEASE)';

  Processing hang occurs when saving content pasted from Google Docs or
  external source

  Details:

  Where does this happen?
  When adding/editing content in a portfolio

  What happens?
  Clicking on "Save" button shows "Processing..." but hangs (403) when 
pre-formatted content pasted from an external source, i.e. Google Docs, Gmail, 
Microsoft Word (less often), etc.
  In addition, if using Mahara's editor only, this will occur if you do things 
such as change the font size.

  Observations:
  - Noticed that this will happen when span tags and li (with style attributes) 
are involved.

  Workarounds:
  - Paste as unformatted text, and make formatting changes from within Mahara.
  - Or avoid (strip out) span or li (with style attributes) tags.

  Other comments:
  Previously, users have been able to do this without issues. If they are to 
make simple edits to content that originated from an external source like 
Google, they risk not being able to save their changes. The quick workaround is 
to copy and paste into a new content area (like mentioned in the workaround). 
The existing content, while can be displayed, may not be edited successfully 
unless the offending tags are stripped.

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