My configuration keeps failing when pushing 5,000 concurrent WebSocket connections via JMeter 5.6 from Singapore. The platform_api returns 429 Too Many Requests after just 200 messages per second, despite staying within documented rate limits. The GC US-East region seems to throttle digital messaging endpoints aggressively compared to voice. Is there a specific header or token refresh strategy needed for high-throughput messaging load tests? Thanks for the help.
Make sure you check your JMeter thread group configuration. The 429 error usually happens when the script sends requests faster than the WebSocket handshake completes, so try adding a constant timer to space out the initial connection bursts.