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|http_path.pl -- Abstract specification of HTTP server locations|
This module provides an abstract specification of HTTP server locations that is inspired on absolute_file_name/3. The specification is done by adding rules to the dynamic multifile predicate http:location/3. The speficiation is very similar to file_search_path/2, but takes an additional argument with options. Currently only one option is defined:
The default priority is 0. Note however that notably libraries may decide to provide a fall-back using a negative priority. We suggest -100 for such cases.
This library predefines a single location at priority -100:
Here is an example that binds
/login to login/1. The user can reuse
this application while moving all locations using a new rule for the
admin location with the option
:- multifile http:location/3. :- dynamic http:location/3. http:location(admin, /, ). :- http_handler(admin(login), login, ). login(Request) :- ...
/. Options currently only supports the priority of the path. If http:location/3 returns multiple solutions the one with the highest priority is selected. The default priority is 0.
This library provides a default for the abstract location
root. This defaults to the setting http:prefix or, when not
available to the path
/. It is adviced to define all
locations (ultimately) relative to
root. For example, use
root('home.html') rather than
http://) URI for the abstract specification Spec. Use http_absolute_location/3 to create references to locations on the same server.