examples: Simplify Request and Response construction (#3653)

examples/form/src/main.rs

@@ -89,7 +89,7 @@ mod tests {
         let app = app();
 
         let response = app
-            .oneshot(Request::builder().uri("/").body(Body::empty()).unwrap())
+            .oneshot(Request::get("/").body(Body::empty()).unwrap())
             .await
             .unwrap();
 
@@ -107,9 +107,7 @@ mod tests {
 
         let response = app
             .oneshot(
-                Request::builder()
-                    .method(http::Method::POST)
-                    .uri("/")
+                Request::post("/")
                     .header(
                         http::header::CONTENT_TYPE,
                         mime::APPLICATION_WWW_FORM_URLENCODED.as_ref(),