Help required HTTP POST implementation

[Taifun]

Here is an example of a correct request Header

App Inventor Tutorials and Examples: Dropbox | Pura Vida Apps

Add a make a list block here

Taifun

[Raj2022]

Thanks Kevinkun,
I did not know but learned from a reply from Taifun.
I tried but with no success.

[Raj2022]

Thanks Taifun,
I understood your reply, but no success.
Please note as soon as I change anything in the Request Header the channel is not created as per requirement. Hence the list of lists did not help.
Sharing both versions I tried.

So I feel something must be done in the PostText section but cannot figure out what exactly.

[Kevinkun]

other same as your previous blocks

[Taifun]

@Raj2022

I understood your reply, but no success

Noone said, you should move everything to the header

Taifun

[Raj2022]

Hi Taifun,
I don't think I am able to understand.
Any change in the Header is not working and PostText works ok but only gives the error message.
So maybe I must live with it.

Thanks for all the help and for getting me up to this level.

[Taifun]

From the blocks in your first post the ONLY thing you have to add is a make a list block in the request header WITHOUT adding or changing anything else

Taifun

[Raj2022]

Hi,
I was not clear on what to add to the second component of make a list. then made a single component make a list, it worked
The working block is as below.

Thanks, both of you.