Re: [Boost-bugs] [Boost C++ Libraries] #8503: Cannot connect to localhost without global connectivity

Subject: Re: [Boost-bugs] [Boost C++ Libraries] #8503: Cannot connect to localhost without global connectivity
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2013-05-24 13:10:44

#8503: Cannot connect to localhost without global connectivity
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  Reporter:  Edward@…               |       Owner:  chris_kohlhoff         
      Type:  Bugs                   |      Status:  closed                 
 Milestone:  To Be Determined       |   Component:  asio                   
   Version:  Boost 1.53.0           |    Severity:  Problem                
Resolution:  invalid                |    Keywords:  localhost AI_ADDRCONFIG
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Comment (by Edward Brey <Edward@…>):

 I realize that it is in theory possible to override the default when
 creating a query. Sometimes, however, that option gets abstracted away. I
 ran into this problem when using the
 [https://github.com/zaphoyd/websocketpp WebSocket++] library, which in
 [https://github.com/zaphoyd/websocketpp/blob/experimental/websocketpp/transport/asio/endpoint.hpp

 endpoint.hpp] creates a query using the default options without exposing
 the options to users of the library. Of course, exposing the options would
 be one resolution to the
 [https://github.com/zaphoyd/websocketpp/issues/244 open issue], but it's
 nice to keep the API smaller if there is a "it just works" solution.

 Am I missing something about the virtues of AI_ADDRCONFIG? If 99% of the
 time, it's best to override the default and turn the flag off, isn't
 keeping AI_ADDRCONFIG as the default likely to trip up unsuspecting
 developers and lead to a lot of "Why doesn't this work on localhost?"
 headaches like I experienced.

 As computers become more mobile, this gotcha will grow more frequent. I
 encountered it simply by turning on airplane mode on my laptop (a commonly
 used Windows 8 feature).

-- 
Ticket URL: <https://svn.boost.org/trac/boost/ticket/8503#comment:2>
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