Couldn't read response in Single read sampler from signalr(.net) websocket server

[Former user]

Hi Peter,

 Thank you for the plugin.

I am trying to read response from the web socket connection to a signalr hub server. I have tried writing text using single write sampler and it reaches the server but when I try to read a message, error is thrown at response timeout (which is quite high ~ 3 minutes).I have already put ping filter since before I had error thrown of wrong type.The text message I am trying to read is a broadcast from server to all connected clients, so I can see that the message has been received by the browser clients but the jmeter client is not getting it. Please let me know if you need any more clarifications

[Peter Doornbosch]

Hi,

I'm that familiar with signalr, so i don't know what's wrong. The general advice that i can give is to start by sniffing the websocket communication between a regular client (browser in your case) and the server, for example with a tool like wireshark. Probably the client is sending a websocket request first that the server is waiting for, or the HTTP request that starts the websocket connection has some special parameters / headers that the server requires before sending data back.

Hth, Peter.

Did you create issue #101 also? If so, can we close it?

[Christopher Mathew]

This issue was solved here :- https://stackoverflow.com/questions/54122668/cannot-read-text-from-net-core-signalr-server-using-single-read-sampler-in-jmet

I have another query , Is it possible to add a jmeter variable as value for the field "response timeout" in Single Read Sampler ie dynamically determine response timeout at run time?

Thanks in Advance!

[Peter Doornbosch]

Sure. You can use JMeter variables anywhere.