http_log_stream/1

Documentation
- Reference manual
- Packages
  - SWI-Prolog HTTP support
    - The HTTP server libraries
      - library(http/http_log): HTTP Logging module
        
        http_log_stream/1
        
        http_log_close/1
        
        http_log/2
        
        password_field/1
        
        nolog/1
        
        nolog_post_content_type/1
        
        post_data_encoded/2
        
        http_logrotate/1
        
        http_schedule_logrotate/2

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

[semidet]http_log_stream(-Stream)

True when Stream is a stream to the opened HTTP log file. Opens the log file in append mode if the file is not yet open. The log file is determined from the setting http:logfile. If this setting is set to the empty atom (''), this predicate fails.

If a file error is encountered, this is reported using print_message/2, after which this predicate silently fails. Opening is retried every minute when a new message arrives.

Before opening the log file, the message http_log_open(Term) is broadcasted. This message allows for creating the directory, renaming, deleting or truncating an existing log file.