debug-headers.md

Use DEBUG=1 for Client Commands

If you're interacting with functions via the fn CLI, you can enable debug mode to see the full details of the HTTP requests going to the Fn server and the responses. The fn CLI simply wraps the Fn API to make it easier to manage your applications and functions. You can always use curl but the CLI is much more convenient!

You enable debug mode by adding DEBUG=1 before fn on each command. For example try the following:

DEBUG=1 fn ls apps

Which, with debugging turn on, returns the following:

GET /v2/apps HTTP/1.1
Host: localhost:8080
User-Agent: Go-http-client/1.1
Accept: application/json
Accept-Encoding: gzip


HTTP/1.1 200 OK
Content-Length: 977
Content-Type: application/json; charset=utf-8
Date: Sun, 13 Oct 2019 16:45:56 GMT


{"items":[{"id":"01DQ2STN6KNG8G00GZJ000001Q","name":"tutorial","syslog_url":"tcp://logs3.papertrailapp.com:NNNN","created_at":"2019-10-13T14:54:45.459Z","updated_at":"2019-10-13T15:55:50.628Z"}]}
NAME		ID
tutorial	01DQ2STN6KNG8G00GZJ000001Q

All debug output is written to stderr while the normal response is written to stdout so it's easy to capture or pipe either for processing.