Those are called one after the other within a loop . Only first API call becomes success subsequent API calls end up with returning this html . No any error message.
<html> <head><title>400 Bad Request</title></head> <body> <center><h1>400 Bad Request</h1></center> <hr><center>cloudflare</center> </body> </html>
If I run the process again first one becomes success and same happnes to the remaining ones . Is there any control with calling multiple API calls?