Multipart/form-data

[Darkhan]

Hello everyone!
I'm trying to use on RapidAPI this service to generate voice (Text To Speech): Text To Speech for 28+ languages. So.. below the structure to do post:

I'm doing :

I understand that I am making a request incorrectly, but I am getting at least some kind of response, but it is with an error:

Help me please if it's possable to create correctly multipart form.
I read somewhere that component WEB does not support such a request.

Thank you!

[TIMAI2]

You read correctly. Web component does not yet work for multipart/form.

[Darkhan]

I read a good example here:

App Inventor Tutorials and Examples: Google Spreadsheet Database | Pura Vida...

and then changed my inquiry:

For forms that do not have large binary (non-ASCII) data, the application/x-www-form-urlencoded content type can be used instead of multipart/form-data

i got correctly answer:

only need delete extra slashes in links:

"https://ttsmp3.com/created_mp3/cc511884d17d2b4294f2a18bef269b6a.mp3"

Thanks!