Http Server in Co-array Fortran

Here’s the translation of the HTTP Server example from Go to Co-array Fortran, formatted in Markdown suitable for Hugo:

program http_server
  use iso_fortran_env
  use iso_c_binding
  implicit none

  ! Simulate HTTP server functionality
  call setup_routes()
  call listen_and_serve()

contains

  subroutine hello(response)
    character(len=*), intent(inout) :: response
    response = "hello"//new_line('a')
  end subroutine hello

  subroutine headers(request, response)
    character(len=*), intent(in) :: request
    character(len=*), intent(inout) :: response
    integer :: i
    character(len=100), dimension(10) :: header_names, header_values
    integer :: header_count

    ! Simulate parsing headers from request
    call parse_headers(request, header_names, header_values, header_count)

    ! Build response with headers
    response = ""
    do i = 1, header_count
      response = response // trim(header_names(i)) // ": " // trim(header_values(i)) // new_line('a')
    end do
  end subroutine headers

  subroutine setup_routes()
    ! Simulate setting up routes
    print *, "Routes set up: /hello and /headers"
  end subroutine setup_routes

  subroutine listen_and_serve()
    ! Simulate server listening
    print *, "Server listening on :8090"
  end subroutine listen_and_serve

  subroutine parse_headers(request, names, values, count)
    character(len=*), intent(in) :: request
    character(len=*), dimension(:), intent(out) :: names, values
    integer, intent(out) :: count
    ! Simulate parsing headers
    count = 2
    names(1) = "Content-Type"
    values(1) = "text/plain"
    names(2) = "User-Agent"
    values(2) = "Fortran-Client/1.0"
  end subroutine parse_headers

end program http_server

This Co-array Fortran code simulates the functionality of an HTTP server. While Fortran is not typically used for web servers, this example demonstrates how similar concepts could be implemented.

The program defines two main handlers: hello and headers, which correspond to the Go example’s handler functions.

The hello subroutine simply sets the response to “hello” followed by a newline.
The headers subroutine simulates parsing request headers and echoing them in the response.
The setup_routes subroutine simulates setting up the routes for “/hello” and “/headers”.
The listen_and_serve subroutine simulates starting the server on port 8090.

To run this Fortran program:

$ gfortran http_server.f90 -o http_server
$ ./http_server
Routes set up: /hello and /headers
Server listening on :8090

Note that this is a simplified simulation. Actual HTTP server implementation in Fortran would require more complex networking code and potentially the use of external libraries for HTTP handling.

In a real-world scenario, you might consider using a language more suited for web server development, or utilize Fortran’s strength in numerical computing by integrating it with a web framework in another language.

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Http Server in Co-array Fortran