Github user alanconway commented on the pull request:
https://github.com/apache/qpid-proton/pull/65#issuecomment-184307353
The problem is that the addresses used by proton are modelled on URLs, and
those characters are not safe in a URL path:
From RFC 1738 specification:
Thus, only alphanumerics, the special characters "$-_.+!*'(),", and
reserved characters used for their reserved purposes may be used unencoded
within a URL.
The charcters ":" and "/" are reserved. Now protons addresses are not
really standardized anywhere, and we could easily hack on the proton C URL
parser to do whatever we like. However many of the proton bindings use the
language-native URL parser instead of the proton C one so breaking the URL
rules could get into trouble elsewhere.
Note that proton's parser (and any language-binding-native URL parser)
should respect the standard URL percent-encoding for special characters, so
that might be the best way to go if you want to encode topic:// as part of a
URL path.
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