Fix Uri extractor not being the full URI if using nest (#156)

src/routing.rs

@@ -907,6 +907,11 @@ where
     }
 
     fn call(&mut self, mut req: Request<B>) -> Self::Future {
+        if req.extensions().get::<OriginalUri>().is_none() {
+            let original_uri = OriginalUri(req.uri().clone());
+            req.extensions_mut().insert(original_uri);
+        }
+
         if let Some((prefix, captures)) = self.pattern.prefix_match(req.uri().path()) {
             let without_prefix = strip_prefix(req.uri(), prefix);
             *req.uri_mut() = without_prefix;
@@ -921,6 +926,11 @@ where
     }
 }
 
+/// `Nested` changes the incoming requests URI. This will be saved as an
+/// extension so extractors can still access the original URI.
+#[derive(Clone)]
+pub(crate) struct OriginalUri(pub(crate) Uri);
+
 fn strip_prefix(uri: &Uri, prefix: &str) -> Uri {
     let path_and_query = if let Some(path_and_query) = uri.path_and_query() {
         let new_path = if let Some(path) = path_and_query.path().strip_prefix(prefix) {