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If you link to a URL with a port number, Markdown will eagerly percent-encode the colon the separates the host name from the port number. See this test message. The chat message I typed in looks like this:

[Test case for bug report about Morkdown](

But the generated HTML (as shown by Chrome's DOM inspector) looks like this:

 <a href="" rel="nofollow">Test case for bug report about Morkdown</a>
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I'm afraid I don't see the percent-encoding, just "" as the link. You should consider including a screenshot too. – jmort253 Dec 11 '12 at 8:34
Click it, or look at it in the DOM. Thanks for the edit @Caleb. – R. Martinho Fernandes Dec 11 '12 at 9:27
"click it" is browser-specific; even with the %-encoding, it works ok in Chrome; not an intentional behavior, though – Marc Gravell Dec 11 '12 at 9:27
@MarcGravell: Same issue here, percent encoded seems to work fine in Chrome. (And even custom links specified as port 80 are being stripped by Chrome to be just the domain when followed). I guess the question is: is percent encoding compliant with whatever protocol spec it needs to be in this case? – Caleb Dec 11 '12 at 9:31
@Marc ah, ok. FWIW, I am using Firefox, which does not fix it. – R. Martinho Fernandes Dec 11 '12 at 9:32
@Caleb if I had to guess, I'll say "not in that location". Intriguing question, though. – Marc Gravell Dec 11 '12 at 9:33
For info, the current behavior is linked to this bug, and links like [link text](http://x.y#http://a.b) - I'm trying to see if I can tweak the handling of ports in the outer url, though – Marc Gravell Dec 11 '12 at 10:06
@Marc oh well, that bug teases me with waffles. Now I'm hungry. – R. Martinho Fernandes Dec 11 '12 at 10:10
@MarcGravell: The relevant RFC makes it relevantly clear (as clear as RFC's generally are) that the colon is used as a component separator and that percent encoding should be applied to each component separately when you don't want the characters to be interpreted as possible component delimiters or other special functions. Applying the encoding to a multi-component bit and thus encoding the delimiter is pretty clearly wrong. – Caleb Dec 11 '12 at 10:15
@Caleb heh; if you want uncertainty, ask each browser vendor whether the "+" in a "mailto" address needs escaping, i.e.; there is no version that works on all browsers – Marc Gravell Dec 11 '12 at 10:44
up vote 6 down vote accepted

All fixed for future usage. Existing links may show using the old handling, and I don't propose refreshing them all.

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