SWI-Prolog -- http

Documentation
- Reference manual
- Packages
  - SWI-Prolog HTTP support
    - The HTTP server libraries
      - The wrapper library
        
        http_wrapper/5
        
        request_expansion/2
        
        http_current_request/1
        
        http_relative_path/2

Availability::- use_module(library(http/http_wrapper)).

http_wrapper(:Goal, +In, +Out, -Connection, +Options)

Handle an HTTP request where In is an input stream from the client, Out is an output stream to the client and Goal defines the goal realising the body. Connection is unified to ’Keep-alive’ if both ends of the connection want to continue the connection or close if either side wishes to close the connection.

This predicate reads an HTTP request-header from In, redirects current output to a memory file and then runs call(Goal, Request), watching for exceptions and failure. If Goal executes successfully it generates a complete reply from the created output. Otherwise it generates an HTTP server error with additional context information derived from the exception.

http_wrapper/5 supports the following options:

request(-Request): Return the executed request to the caller.
peer(+Peer): Add peer(Peer) to the request header handed to Goal. The format of Peer is defined by tcp_accept/3 from the clib package.