Description:
------------
"var_dump(parse_url('http://baidu.com\pinyin.sogou.com'));"
array(2) {
  ["scheme"]=>
  string(4) "http"
  ["host"]=>
  string(26) "baidu.com\pinyin.sogou.com"
}
"baidu.com\pinyin.sogou.com" maybe is an illegal host
ps:空格及符号如“？/\；：@#$%^~_=+，8． 。<>”等都不能用在域名命名 https://zhidao.baidu.com/question/337004301.html


Test script:
---------------
var_dump(parse_url('http://baidu.com\pinyin.sogou.com'));
array(2) {
  ["scheme"]=>
  string(4) "http"
  ["host"]=>
  string(26) "baidu.com\pinyin.sogou.com"
}

Expected result:
----------------
array(2) {
  ["scheme"]=>
  string(4) "http"
  ["host"]=>
  string(26) "baidu.com"
}

Actual result:
--------------
array(2) {
  ["scheme"]=>
  string(4) "http"
  ["host"]=>
  string(26) "baidu.com\pinyin.sogou.com"
}