[[inputs.http]] error table `headers' is in conflict

[marcoc610]

I need to define multiple instances of the inputs.http plugin.

This plugin seems not to allow "headers" in multiple instances.
A configuration like the one below produces an error in toml parsing:

toml: line 11: table headers' is in conflict with normal table in line 5`

Relevant telegraf.conf:

[[inputs.http]]
  urls = [
    "https://HOST1/api/"
  ]
  headers = {"Authorization" = "Basic YXBpdXNlcjphcGlwYXNzMTg="}

[[inputs.http]]
  urls = [
    "https://HOST2/api/"
  ]
  headers = {"Authorization" = "Basic YXBpdXNlcjphcGlwYXNzOA=="}

If I remove one of the headers lines, the configuration is accepted.
The behaviour does not change if:

1. I change the header contents (different key/value pairs)
2. I change the toml table format (from headers={...} to [headers] ...)
3. I add or remove other lines to the plugin configuration (data_format, insecure_skip_verify, taginclude,...)

I know that this particular case can be addressed using the plugin syntax

username=
password=

but I need to define multiple instances because different systems require different headers.

System info:

Telegraf v1.6.1 (git: release-1.6 bf0ab27)
on
Ubuntu 16.04

Actual behavior:

$ telegraf --test --config-directory /etc/telegraf/telegraf.d

2018/05/03 13:17:58 I! Using config file: /etc/telegraf/telegraf.conf
2018/05/03 13:17:58 E! Error parsing /etc/telegraf/telegraf.d/aaa.conf, toml: line 11: table `headers' is in conflict with normal table in line 5

[danielnelson]

This appears to be a bug in the toml parser we are using, which is an out of date fork of naoina/toml.

As a workaround you can use regular non-inline table syntax:

[[inputs.http]]
  [inputs.http.headers]
    Authorization = "Basic YXBpdXNlcjphcGlwYXNzMTg="

[[inputs.http]]
  [inputs.http.headers]
    Authorization = "Basic YXBpdXNlcjphcGlwYXNzOA=="

Make sure you put all tables at the end of the plugin config so nothing inadvertently becomes falls under it.

[marcoc610]

Thank you @danielnelson !
It actually works with your suggestion.