Restructure folders (#411)

json/json_decode_error/src/main.rs

@@ -0,0 +1,44 @@
+use actix_web::{
+    error, post, web, App, HttpRequest, HttpResponse, HttpServer, Responder,
+};
+use serde::Deserialize;
+
+#[derive(Deserialize)]
+struct Info {
+    name: String,
+}
+
+#[post("/")]
+async fn greet(name: web::Json<Info>) -> impl Responder {
+    HttpResponse::Ok().body(format!("Hello {}!", name.name))
+}
+
+fn json_error_handler(err: error::JsonPayloadError, _req: &HttpRequest) -> error::Error {
+    use actix_web::error::JsonPayloadError;
+
+    let detail = err.to_string();
+    let resp = match &err {
+        JsonPayloadError::ContentType => {
+            HttpResponse::UnsupportedMediaType().body(detail)
+        }
+        JsonPayloadError::Deserialize(json_err) if json_err.is_data() => {
+            HttpResponse::UnprocessableEntity().body(detail)
+        }
+        _ => HttpResponse::BadRequest().body(detail),
+    };
+    error::InternalError::from_response(err, resp).into()
+}
+
+#[actix_web::main]
+async fn main() -> std::io::Result<()> {
+    HttpServer::new(|| {
+        App::new().service(greet).app_data(
+            web::JsonConfig::default()
+                // register error_handler for JSON extractors.
+                .error_handler(json_error_handler),
+        )
+    })
+    .bind("127.0.0.1:8088")?
+    .run()
+    .await
+}