diff --git a/src/request.rs b/src/request.rs
index d50ff65..c836efc 100644
--- a/src/request.rs
+++ b/src/request.rs
@@ -20,13 +20,10 @@ pub struct Request {
 
 impl RequestBase for Request {
     fn new<T: IntoUrl>(url: T) -> Result<Request, ParseError> {
-        match url.into_url() {
-            Ok(url_parsed) => Ok(Request {
-                url: url_parsed,
-                method: Method::GET,
-            }),
-            Err(error) => Err(error),
-        }
+        url.into_url().map(|url_parsed| Request {
+            url: url_parsed,
+            method: Method::GET,
+        })
     }
 
     fn launch(self) -> response::Response {
diff --git a/src/response.rs b/src/response.rs
index 8c15fbd..ed94a1f 100644
--- a/src/response.rs
+++ b/src/response.rs
@@ -13,7 +13,7 @@ pub struct Response {
 }
 
 impl SelectorBase for Response {
-    fn from_html(_: String) -> Self {
+    fn from_html<S: AsRef<str>>(_: S) -> Self {
         unimplemented!()
     }
 
diff --git a/src/selector.rs b/src/selector.rs
index 4e19690..2aac23c 100644
--- a/src/selector.rs
+++ b/src/selector.rs
@@ -1,5 +1,5 @@
 pub trait SelectorBase {
-    fn from_html(html: String) -> Self;
+    fn from_html<S: AsRef<str>>(html: S) -> Self;
 
     fn html(&self) -> String;
 
@@ -58,9 +58,9 @@ pub struct Selector {
 }
 
 impl SelectorBase for Selector {
-    fn from_html(html: String) -> Self {
+    fn from_html<S: AsRef<str>>(html: S) -> Self {
         Selector {
-            text: html.to_string(),
+            text: html.as_ref().to_string(),
         }
     }
 
diff --git a/tests/unit_tests.rs b/tests/unit_tests.rs
index 605cc1a..f4a98e7 100644
--- a/tests/unit_tests.rs
+++ b/tests/unit_tests.rs
@@ -15,8 +15,7 @@ fn plain_text_selector() {
     <a>simple text</a>
   </body>
 </html>
-"
-    .to_string();
+";
     let sel = Selector::from_html(html);
     assert_eq!(sel.css("h1")[0].html(), "<h1>hello world</h1>");
     assert_eq!(sel.css("#text")[0].content(), "good bye");
@@ -50,8 +49,7 @@ fn complex_selectors() {
     </div>
   </body>
 </html>
-"
-    .to_string();
+";
     let sel = Selector::from_html(html);
     assert_eq!(sel.css_once("p").unwrap().attr("id").unwrap(), "text");
     assert_eq!(sel.css("a")[0].attr("href").unwrap(), "http://google.com");
@@ -86,8 +84,7 @@ fn xpath_test() {
     </div>
   </body>
 </html>
-"
-    .to_string();
+";
     let sel = Selector::from_html(html);
     assert_eq!(
         sel.xpath_once("//div/a[1]").unwrap().content(),