empty string when password does not exists

standard: https://url.spec.whatwg.org/#url-representation
"A URL’s password is an ASCII string identifying a password. It is initially the empty string."

test

url/src/lib.rs

@@ -921,7 +921,8 @@ impl Url {
         }
     }
 
-    /// Return the password for this URL, if any, as a percent-encoded ASCII string.
+    /// Return the password for this URL (typically the empty string)
+    /// as a percent-encoded ASCII string.
     ///
     /// # Examples
     ///
@@ -931,31 +932,34 @@ impl Url {
     ///
     /// # fn run() -> Result<(), ParseError> {
     /// let url = Url::parse("ftp://rms:[email protected]")?;
-    /// assert_eq!(url.password(), Some("secret123"));
+    /// assert_eq!(url.password(), "secret123");
     ///
     /// let url = Url::parse("ftp://:[email protected]")?;
-    /// assert_eq!(url.password(), Some("secret123"));
+    /// assert_eq!(url.password(), "secret123");
+    ///
+    /// let url = Url::parse("ftp://rms:@example.com")?;
+    /// assert_eq!(url.password(), "");
     ///
     /// let url = Url::parse("ftp://[email protected]")?;
-    /// assert_eq!(url.password(), None);
+    /// assert_eq!(url.password(), "");
     ///
     /// let url = Url::parse("https://example.com")?;
-    /// assert_eq!(url.password(), None);
+    /// assert_eq!(url.password(), "");
     /// # Ok(())
     /// # }
     /// # run().unwrap();
     /// ```
-    pub fn password(&self) -> Option<&str> {
+    pub fn password(&self) -> &str {
         // This ':' is not the one marking a port number since a host can not be empty.
         // (Except for file: URLs, which do not have port numbers.)
         if self.has_authority()
             && self.username_end != self.serialization.len() as u32
             && self.byte_at(self.username_end) == b':'
         {
             debug_assert!(self.byte_at(self.host_start - 1) == b'@');
-            Some(self.slice(self.username_end + 1..self.host_start - 1))
+            self.slice(self.username_end + 1..self.host_start - 1)
         } else {
-            None
+            ""
         }
     }
 

url/src/quirks.rs

@@ -124,7 +124,7 @@ pub fn set_username(url: &mut Url, new_username: &str) -> Result<(), ()> {
 /// Getter for https://url.spec.whatwg.org/#dom-url-password
 #[inline]
 pub fn password(url: &Url) -> &str {
-    url.password().unwrap_or("")
+    url.password()
 }
 
 /// Setter for https://url.spec.whatwg.org/#dom-url-password
@@ -219,7 +219,7 @@ pub fn set_hostname(url: &mut Url, new_hostname: &str) -> Result<(), ()> {
                     ||!port(url).is_empty()
                     // Empty host that includes credentials
                     || !url.username().is_empty()
-                    || !url.password().unwrap_or("").is_empty()
+                    || !url.password().is_empty()
                 {
                     return Err(());
                 }