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Whenever the following characters appear in an URL in a link of the form [foo][1] … [1]: http://..., the server won't parse it as URL:

  • ^, {, }, \

and the following won't work in preview:

  • $, ^, *, [, ], {, }, \, ', "

This causes great trouble when copying links from the URL bar. Browsers seldom escape every character, e.g. in Firefox ~!^*_-{}|[]\. in a query string will not be escaped, while in Chrome `~!$^*()_-{}|[]\:;',./ won't be escaped. For example, all 3 Wolfram Alpha links by this user fails to appear because of ^, { and }. Fixing these links are annoying.

Therefore, I propose that when one creates a link or image through the toolbar (Ctrl+L / Ctrl+G), the system should be able to escape at least the above mentioned characters.

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A temporary workaround is to use something like this –  Larry Wang Aug 10 '10 at 16:08
Minor detail: a trailing asterisk indeed does not work in preview, but not in the end result either, not even when using Ctrl-L or when explicitly using the angle brackets syntax like <http://en.wikipedia.org/wiki/IDA*> (Maybe a clash with the Markdown for italic?) –  Arjan Dec 8 '10 at 20:27

1 Answer 1

up vote 6 down vote accepted

When entering a link via the dialog, we now make sure to encode "nasty" characters, so the resulting link definition is actually usable.

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yay! –  Adam Davis Mar 11 '11 at 14:30
Am I right that the underscore is no longer escaped to be %5F? That is good, as Firefox treats an escaped underscore differently than Chrome, which might mess up when the server is not configured correctly. Like try http://pear.php.net/package/XML%5FSerializer in both browsers, and in Firefox note the URL in the 404 message. If indeed the underscore is no longer escaped by design, then I guess the ancient Link with underscore does not work is actually status-completed by now! :-) –  Arjan Dec 24 '11 at 11:26

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