[Chicken-janitors] #567: Make authentication modular in http-client

[Chicken Trac]

#567: Make authentication modular in http-client
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 Reporter:  sjamaan                                               |       
Owner:  sjamaan
     Type:  enhancement                                           |      
Status:  new    
 Priority:  major                                                 |   
Milestone:         
Component:  extensions                                            |     
Version:         
 Keywords:  authentication, authorization, http-client, intarweb  |  
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 Currently basic and digest auth are hardcoded in http-client. As Thomas
 Hintz pointed out, there are services like Amazon S3 that have their own
 homebrew (and less secure...) authentication system which re-uses the
 "authorization" header with a custom scheme.

 It would be great if the authentication schemes were extensible so we can
 cope with those custom schemes without having to add them to a huge pile
 inside http-client itself. This is not desirable because there may be many
 of these one-off systems out there, and they're all nonstandard and may
 even change and disappear over time.

 Possibly some of the standard auth stuff can be moved inside intarweb too.
 Not sure yet.

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Ticket URL: <https://bugs.call-cc.org/ticket/567>
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