Check for localhost when setting a file host

Author: o0Ignition0o

src/parser.rs

@@ -879,8 +879,7 @@ impl<'a> Parser<'a> {
                 // url is special and c is U+005C (\)
                 // If @ flag is set and buffer is the empty string, validation error, return failure.
                 if let (Some(c), _) = remaining.split_first() {
-                    if c == '/' || c == '?' || c == '#'
-                    || scheme_type.is_special() && c == '\\' {
+                    if c == '/' || c == '?' || c == '#' || scheme_type.is_special() && c == '\\' {
                         return Err(ParseError::InvalidAuthority);
                     }
                 }
@@ -1015,7 +1014,10 @@ impl<'a> Parser<'a> {
 
     pub fn get_file_host<'i>(input: Input<'i>) -> ParseResult<(Host<String>, Input)> {
         let (_, host_str, remaining) = Parser::file_host(input)?;
-        let host = Host::parse(&host_str)?;
+        let host = match Host::parse(&host_str)? {
+            Host::Domain(ref d) if d == "localhost" => Host::Domain("".to_string()),
+            host => host,
+        };
         Ok((host, remaining))
     }
 

src/quirks.rs

@@ -177,8 +177,8 @@ pub fn set_hostname(url: &mut Url, new_hostname: &str) -> Result<(), ()> {
     if let Ok((host, _remaining)) = result {
         if let Host::Domain(h) = &host {
             if h.is_empty() {
-                // Empty host on special url
-                if SchemeType::from(url.scheme()).is_special()
+                // Empty host on special not file url
+                if SchemeType::from(url.scheme()) == SchemeType::SpecialNotFile
                     // Port with an empty host
                     ||!port(&url).is_empty()
                     // Empty host with includes credentials