apisix/docs/en/latest/architecture-design/debug-mode.md

title
Debug Mode

Basic Debug Mode

Enable basic debug mode just by setting apisix.enable_debug = true in conf/config.yaml file.

e.g Using both limit-conn and limit-count plugins for a /hello request, there will have a response header called Apisix-Plugins: limit-conn, limit-count.

$ curl http://127.0.0.1:1984/hello -i
HTTP/1.1 200 OK
Content-Type: text/plain
Transfer-Encoding: chunked
Connection: keep-alive
Apisix-Plugins: limit-conn, limit-count
X-RateLimit-Limit: 2
X-RateLimit-Remaining: 1
Server: openresty

hello world

If the information can be delivered via HTTP response header, for example, the plugin is in stream subsystem, the information will be logged in the error log with warn level.

Advanced Debug Mode

Enable advanced debug mode by modifying the configuration in conf/debug.yaml file. Because there will be a check every second, only the checker reads the #END flag, and the file would be considered as closed.

The checker would judge whether the file data changed according to the last modification time of the file. If there has any change, reload it. If there was no change, skip this check. So it's hot reload for enabling or disabling advanced debug mode.

Key	Optional	Description	Default
hook_conf.enable	required	Enable/Disable hook debug trace. Target module function's input arguments or returned value would be printed once this option is enabled.	false
hook_conf.name	required	The module list name of hook which has enabled debug trace.
hook_conf.log_level	required	Logging levels for input arguments & returned value.	warn
hook_conf.is_print_input_args	required	Enable/Disable input arguments print.	true
hook_conf.is_print_return_value	required	Enable/Disable returned value print.	true

Example:

hook_conf:
  enable: false # Enable/Disable Hook Debug Trace
  name: hook_phase # The Module List Name of Hook which has enabled Debug Trace
  log_level: warn # Logging Levels
  is_print_input_args: true # Enable/Disable Input Arguments Print
  is_print_return_value: true # Enable/Disable Returned Value Print

hook_phase: # Module Function List, Name: hook_phase
  apisix: # Referenced Module Name
    - http_access_phase # Function Names：Array
    - http_header_filter_phase
    - http_body_filter_phase
    - http_log_phase
#END