Environment

IOS

Current Behavior

Create a HTTPSClientSession, sendRequest and receiveResponse. Move app to background and move it back to foreground a few minutes later. Then the underlying socket will be invalid and read function fall into infinite loop.

Expect Behavior

read function return error when socket is invalid.

Reason

when socket is invalid, SSL_read return -1, but mustRetry always return true, so receiveBytes fall into infinite loop. This is because poll always return true when socket is invalid(platform specific).

Possible Solution

SSL_MODE_AUTO_RETRY is set by poco:

and socket is blocking, there is no need to retry when SSL_read return error, reference: https://www.openssl.org/docs/man1.1.1/man3/SSL_read.html
revert f7ba58c can fix it.