Botting HTTP requests

[Fxwfran]

Hello, I've been recently trying to bot an iOS game called Monster Legends but I'm not quite experienced in HTTP botting so I'm kinda lost in here.
Here's what I've done:

I connected my phone through a proxy in order to monitor it's traffic with Burp Suite with my pc.
Now I can perfectly monitor every single GET or POST request this game handles, but when I try to repeat one of the requests that my phone POSTS to the game's host I come up to this error:



Apparently I can keep sending the request to the server, but it just wont recongize it. Any ideas on how to modify the request so that I can make a POST bot?

[delkaka]

probably u can sniff and edit packets but u can't create new