SWI-Prolog -- html_print

Documentation
- Reference manual
- Packages
  - SWI-Prolog HTTP support
    - The HTTP server libraries
      - The library(http/html_write) library
        
        Emitting HTML documents
        
        reply_html_page/2
        
        reply_html_page/3
        
        reply_html_partial/1
        
        print_html/1
        
        print_html/2
        
        html_print_length/2

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

html_print_length(+List, -Length)

When calling html_print/[1,2] on List, Length characters will be produced. Knowing the length is needed to provide the Content-length field of an HTTP reply-header.