What is the syntax of the Bitrix webhook containing array?

Question

Python

I send a request to the Bitrix24 api to create a comment on the task.
/task.commentitem.add/?TASKID=&FIELDS[]=[{'POST_MESSAGE':'HELLO'}] I'm getting
an error message.
Param #1 (arFields) for method ctaskcommentitem::add() must not contain key \u00220\u0022.; 256\/TE\/WRONG_ARGUMENTS
UPD:
If I make a request like
/task.commentitem.add/?TASKID=xxx&FIELDS[POST_MESSAGE]=HELLO
I get a different error message
Too much params(4) given for method ctaskcommentitem::add() , but expected not more than 2
What should be the syntax?

Answer 1

You misinterpreted the documentation for the relevant webhook (task.commentitem.add) .
Your request should actually look like this:
/task.commentitem.add/?TASKID=xxx&FIELDS[POST_MESSAGE]=HELLO
And as you can see, there are no curly braces there, and the only Array that is there is one key in FIELDS.