/**
* Sends a request and optionally reads a response. Returns true if the request was successfully
* executed, and false if the request can be retried. Throws an exception if the request failed
* permanently.
*/
private boolean execute(boolean readResponse) throws IOException {
try {
httpEngine.sendRequest();
if (readResponse) {
httpEngine.readResponse();
}
return true;
} catch (IOException e) {
if (handleFailure(e)) {
return false;
} else {
throw e;
}
}
}
