I know this is irrelevant at this point, but I'm curious about your statement. Other searches point to the same logic - e.g., one of the most popular php frameworks [also does it](https://github.com/symfony/HttpFoundation/blob/master/Request.php#L1123). Is it precaution, lack of standard or just incorrect? I'm not aware of any proxy doing this, but I'd like to know from your experience though.