Android检查WebService是否在端口上可用

Question

I need to check if a service is running on a specific IP:PORT/service/ and if its not then fallback to another one. I am doing this on a single place in the app.

Is there a way to just PING it if its alive instead of trying to send a valid request to it and catch a possible IO error?

Answer 1

Refer accepted answer this question for web service availability check, if webservice is not there (else condition) then try fallback connection

webservice availability check in android

Answer 2

The way i solved this is:

We implemented a Ping method on the backend at /service/ping which responded with status HTTP_OK (200) . i walk through each IP address i need to test with a very short connection timeout set and see if i get to one where i receive a successful connection (status returned is 200).

I had to go through all the IP's on a local wifi network and find where my local network service was hosted. Since the devices are connected to the same wifi network i have setup a connection timeout of 200ms which was more than enough to make sure the check was fast.