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Since files are merely sources of bits, you can replace files with some
computation which
generates the desired stream of bits.
In fact, it is easier just to think of a URL as having an associated
function that computes
its response, whether from a file or other information sources.
>
>The functionality of export-url which I am interested in at present
>establishes a mapping between a URL and a pathname, but how this works
>is not entirely clear. Can you give me pointers to more documentation?
Just export a directory with the directory export type and give as the
pathname argument
the directory to which the URL should be rooted. If you specify
recursive-p t, then all
subdirectories are exported as well.
>
>I get the impression from the examples file that all your resources have
>to reside (or be pointed to via links) precisely one level under the
>http directory. Is this the case?
No. String search for recursive or read the documentation for export-url
I also had problems recursively
>importing subdirectories; the mapping does not seem to exist for the
>subdirectories. The redirect mechanism is also a mystery - what
>restrictions are there on the URL argument supplied and how can I
>construct the alternative URLs?
Redirects are like links in URL space. They tell clients to go visit a
second URL whenever
the first URL is accessed.