HTTP Error 502.3 in self hosted SignalR in AppService

Viktor Kukurudziak 1

Hello,
We have SignalR added to our app service.
Generally it works, but from time to time we get HTTP error 502.3.
More details in attached file

Lex Li (Microsoft) 4,662 Reputation points Microsoft Employee

2022-11-23T05:54:01.85+00:00

Nothing is 100% reliable over the internet, so such HTTP connection related 502.3 errors are common and you just need to handle them properly in your browser/client side. Retry mechanism will be your friend.
Viktor Kukurudziak 1 Reputation point

2022-11-23T08:19:21.38+00:00

I understand that and thanks for solution, but that's not my main problem.
We have 5xx alerts configured for AppService and having 40+ alerts daily making this alerts useless.
Lex Li (Microsoft) 4,662 Reputation points Microsoft Employee

2023-01-18T17:49:14.42+00:00

So, what's the error rate? For example, 40+ isn't a surprise if the total requests are >10,000. If you do want to dive into some failed requests, you can enable SignalR tracing. Note that such tracing has impact on application performance.