Fatal error: Unparenthesized `a ? b : c ? d : e` is deprecated. Use either `(a ? b : c) ? d : e` or `a ? b : (c ? d : e)` for line 1773 and 1774 of httprl.module.
I updated the two lines in question with the following, and it fixed the issue for me:
$location['host'] = (!empty($location['host']) ? $location['host'] : !empty($original_location['host'])) ? $original_location['host'] : $_SERVER['HTTP_HOST'];
$location['port'] = (!empty($location['port']) ? $location['port'] : !empty($original_location['port'])) ? $original_location['port'] : '';
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Created patch for this error for version 7.x-1.14 for HTTP Parallel Request & Threading Library module. I'll attach it here in case it might come in handy.
It basically solves the deprecation in the same way, also adding parenthesis to solve the ambiguity. However uses the parenthesis in the latter part as I believed it made more sense for the logic of the condition.