use dummy json file. not working

backend/Cargo.toml

@@ -6,18 +6,8 @@ edition = "2021"
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
-#   Compiling actix-server v2.2.0
-#   Compiling actix-http v3.3.1
-#   Compiling actix-web v4.3.1
 actix-web ="4"
-
-#   Compiling actix-rt v2.8.0
-actix-rt = "*"
-
-#actix-swagger = "*"
-serde = "*"
-#utoipa = { version = "3", features = ["actix_extras"] }
-#   Compiling utoipa-swagger-ui v3.1.4
+actix-files = "*"
 utoipa-swagger-ui = { version = "3", features = ["actix-web"] }
 
 [[bin]]

backend/main.rs

@@ -1,10 +1,30 @@
-HttpServer::new(move || {
-   App::new()
-         .service(
-             SwaggerUi::new("/swagger-ui/{_:.*}")
-                 .url("/api-docs/openapi.json", ApiDoc::openapi()),
-         )
-     })
-.bind((Ipv4Addr::UNSPECIFIED, 8000)).unwrap()
-   .run();
+use actix_web::{web, App, HttpResponse, HttpServer};
+use utoipa_swagger_ui::{get_swagger_ui, DefaultConfig};
 
+#[actix_web::main]
+async fn main() -> std::io::Result<()> {
+    HttpServer::new(|| {
+        let swagger_config = DefaultConfig::new("http://localhost:8080", "/openapi.json");
+        App::new()
+            .service(get_swagger_ui(&swagger_config))
+            .route("/openapi.json", web::get().to(get_openapi_spec))
+    })
+    .bind("0.0.0.0:8080")?
+    .run()
+    .await
+}
+
+async fn get_openapi_spec() -> HttpResponse {
+    let openapi_spec = r#"
+    {
+        "openapi": "3.0.0",
+        "info": {
+            "title": "Dummy API",
+            "version": "1.0"
+        },
+        "paths": {}
+    }
+    "#;
+
+    HttpResponse::Ok().body(openapi_spec)
+}

backend/openapi.json

@@ -0,0 +1,19 @@
+{
+    "openapi": "3.0.0",
+    "info": {
+        "title": "My API",
+        "version": "1.0"
+    },
+    "paths": {
+        "/example": {
+            "get": {
+                "summary": "Get example",
+                "responses": {
+                    "200": {
+                        "description": "OK"
+                    }
+                }
+            }
+        }
+    }
+}