refactor: address clippy warnings

actix-http/src/h1/dispatcher.rs

@@ -706,7 +706,7 @@ where
 
                             req.head_mut().peer_addr = *this.peer_addr;
 
-                            req.conn_data = this.conn_data.clone();
+                            req.conn_data.clone_from(this.conn_data);
 
                             match this.codec.message_type() {
                                 // request has no payload

actix-http/src/h2/dispatcher.rs

@@ -126,7 +126,7 @@ where
                     head.headers = parts.headers.into();
                     head.peer_addr = this.peer_addr;
 
-                    req.conn_data = this.conn_data.clone();
+                    req.conn_data.clone_from(&this.conn_data);
 
                     let fut = this.flow.service.call(req);
                     let config = this.config.clone();

actix-multipart/src/form/mod.rs

@@ -313,7 +313,8 @@ where
                     let entry = field_limits
                         .entry(field.name().to_owned())
                         .or_insert_with(|| T::limit(field.name()));
-                    limits.field_limit_remaining = entry.to_owned();
+
+                    limits.field_limit_remaining.clone_from(entry);
 
                     T::handle_field(&req, field, &mut limits, &mut state).await?;
 

actix-router/src/path.rs

@@ -154,15 +154,11 @@ impl<T: ResourcePath> Path<T> {
         None
     }
 
-    /// Get matched parameter by name.
+    /// Returns matched parameter by name.
     ///
     /// If keyed parameter is not available empty string is used as default value.
     pub fn query(&self, key: &str) -> &str {
-        if let Some(s) = self.get(key) {
+        self.get(key).unwrap_or_default()
-            s
-        } else {
-            ""
-        }
     }
 
     /// Return iterator to items in parameter container.

actix-web/src/config.rs

@@ -148,7 +148,7 @@ impl AppConfig {
 
     #[cfg(test)]
     pub(crate) fn set_host(&mut self, host: &str) {
-        self.host = host.to_owned();
+        host.clone_into(&mut self.host);
     }
 }
 

actix-web/src/resource.rs

@@ -771,7 +771,7 @@ mod tests {
                              data3: web::Data<f64>| {
                                 assert_eq!(**data1, 10);
                                 assert_eq!(**data2, '*');
-                                let error = std::f64::EPSILON;
+                                let error = f64::EPSILON;
                                 assert!((**data3 - 1.0).abs() < error);
                                 HttpResponse::Ok()
                             },