Getting "use of closed connection" error

[digi0pz]

Hello!

I'm just trying to set this up for the first time and see how my TCP connection pooling is working. But I'm getting this error regardless of whether I trying to hit from the Postman or my golang application:

[4] CLIENT error, read tcp 127.0.0.1:8005->127.0.0.1:52963: use of closed network connection

Here's the command I'm running:

tproxy -p 8005 -r <private_host>.amazonaws.com:80 -t http2

I fear I'm missing out on something basic.
Can you help me out here? Thanks in advance.

[kevwan]

Thanks for using tproxy!

Is your service serving with HTTP2? And would you please take a screenshot on how you used postman if possible?

[digi0pz]

Thanks for your reply!

I'm using tproxy in front of OpenSearch and afaik it doesn't support HTTP2.
Attaching the screenshot of Postman along with the console error.

[digi0pz]

Here's how the tproxy logs look as well (removing the URL/request body content):

01:18:32.895 from CLIENT [1]
grpc:(http2:preface)
[...]

01:18:32.895 from CLIENT [1]
grpc:(http2:unknown_frame_type_47 stream:774966538 len:5526608)
[...]

01:18:32.921 [1] Client connection closed
01:18:32.921 [1] Server connection closed
01:18:32.921 [1] CLIENT error, read tcp 127.0.0.1:8005->127.0.0.1:50367: use of closed network connection

I'm passing the -t http2 flag but I'm still getting grpc in the logs. Am I doing something wrong?