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http_files.pl -- Serve plain files from a hierarchy
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Although the SWI-Prolog Web Server is intended to serve documents that are computed dynamically, serving plain files is sometimes necessary. This small module combines the functionality of http_reply_file/3 and http_reply_dirindex/3 to act as a simple web-server. Such a server can be created using the following code sample, which starts a server at port 8080 that serves files from the current directory ('.'). Note that the handler needs a prefix option to specify that it must handle all paths that begin with the registed location of the handler.

:- use_module(library(http/thread_httpd)).
:- use_module(library(http/http_dispatch)).

:- http_handler(root(.), http_reply_from_files('.', []), [prefix]).

:- initialization
      http_server(http_dispatch, [port(8080)]).
See also
- pwp_handler/2 provides similar facilities, where .pwp files can be used to add dynamic behaviour.
Source http_reply_from_files(+Dir, +Options, +Request)
HTTP handler that serves files from the directory Dir. This handler uses http_reply_file/3 to reply plain files. If the request resolves to a directory, it uses the option indexes to locate an index file (see below) or uses http_reply_dirindex/3 to create a listing of the directory.

Options:

indexes(+List)
List of files tried to find an index for a directory. The default is ['index.html'].

Note that this handler must be tagged as a prefix handler (see http_handler/3 and module introduction). This also implies that it is possible to override more specific locations in the hierarchy using http_handler/3 with a longer path-specifier.

Arguments:
Dir- is either a directory or an path-specification as used by absolute_file_name/3. This option provides great flexibility in (re-)locating the physical files and allows merging the files of multiple physical locations into one web-hierarchy by using multiple file_search_path/2 clauses that define the same alias.
See also
- The hookable predicate file_mime_type/2 is used to determine the Content-type from the file name.