If an error looks like a "disconnected client" but the response is not
yet committed then it can't be an I/O error from writing to the server
response. It is most likely as a result of a remote call as part of
request handling.
Not setting the response to 500 in this case results in a 200 response
status despite the error. Even if it was an I/O error from the server
response, setting the status won't impact a failed response.
Closes gh-23319
4edc7196fb