Issue with Unexpected HTML Responses Instead of JSON

1

Hi everyone!

I am writing because of an issue I'm experiencing when using zrok to forward an application running locally.

The application is correctly visualized through the zrok forwarded link, but when I try to interact with it ( it is a UI to collect and query data from ML experiments GitHub - aimhubio/aim: Aim 💫 — An easy-to-use & supercharged open-source experiment tracker.), I receive an error indicating that the data expected to be in JSON format is actually HTML. The exact error message is:

Unexpected token '<', "<html> <h"... is not valid JSON

This issue does not occur when accessing the application directly on the local network, where JSON responses are correctly received and parsed.

Previously, I used ngrok for the same scope and did not have this issues.

Here is also a snippet from the logs running zrok in verbose mode:

[sdk-golang/ziti/edge/network.(*edgeConn).Read: unexpected sequencer err (read timed out)]

Thanks in advance for any help!!

2

Can you check the response code? HTML is returned when you receive 404 Not Found. It might be your share is not currently available (or at a different address than you're expecting).

3

Hi @softmax, welcome to the community and to zrok (and OpenZiti)!

can you share the command you used to share the service? I'm guessing/thinking you used --backend-mode web but you probably don't want that. You probably want to leave the --backend-mode empty.

Would you share the command you used?