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+# Introducing the Angular Service Proxy Generation
+
+Angular Service Proxy System **generates TypeScript services and models** to consume your backend HTTP APIs developed using the ABP Framework. So, you **don't manually create** models for your server side DTOs and perform raw HTTP calls to the server.
+
+ABP Framework has introduced the **new** Angular Service Proxy Generation system with the version 3.1. While this feature was available since the [v2.3](https://blog.abp.io/abp/ABP-Framework-v2_3_0-Has-Been-Released), it was not well covering some scenarios, like inheritance and generic types and had some known problems. **With the v3.1, we've re-written** it using the [Angular Schematics](https://angular.io/guide/schematics) system. Now, it is much more stable and feature rich.
+
+This post introduces the service proxy generation system and highlights some important features.
+
+## Installation
+
+### ABP CLI
+
+You need to have the [ABP CLI](https://docs.abp.io/en/abp/latest/CLI) to use the system. So, install it if you haven't installed before:
+
+````bash
+dotnet tool install -g Volo.Abp.Cli
+````
+
+If you already have installed it before, you can update to the latest version:
+
+````shell
+dotnet tool update -g Volo.Abp.Cli
+````
+
+### Project Configuration
+
+> If you've created your project with version 3.1 or later, you can skip this part since it will be already installed in your solution.
+
+For the solution was created before v3.1, follow the steps below to configure your angular project:
+
+* Add `@abp/ng.schematics` package to the `devDependencies` of the Angular project (run the following command in the root folder of the angular application):
+
+````bash
+npm install @abp/ng.schematics --save-dev
+````
+
+- Add `rootNamespace` entry into the `/apis/default/` section in the `/src/environments/environment.ts`, as shown below:
+
+```json
+apis: {
+  default: {
+    ...
+    rootNamespace: 'Acme.BookStore' //<-- ADD THIS
+  },    
+}
+```
+
+`Acme.BookStore` should be replaced by the root namespace of your .NET project. This ensures to not create unnecessary nested folders while creating the service proxy code.
+
+## Basic Usage
+
+### Project Creation
+
+Assuming you've created your project with the Angular UI.
+
+Example (using the [ABP CLI](https://docs.abp.io/en/abp/latest/CLI)):
+
+````bash
+abp new AngularProxyDemo -u angular
+````
+
+#### Run the Application
+
+The backend application must be up and running to be able to use the service proxy code generation system.
+
+> See the [getting started](https://docs.abp.io/en/abp/latest/Getting-Started?UI=NG&DB=EF&Tiered=No) guide if you don't know how create and to run the project.
+
+### Backend
+
+Assume that we have an `IBookAppService` interface:
+
+````csharp
+using System.Collections.Generic;
+using System.Threading.Tasks;
+using Volo.Abp.Application.Services;
+
+namespace AngularProxyDemo.Books
+{
+    public interface IBookAppService : IApplicationService
+    {
+        public Task<List<BookDto>> GetListAsync();
+    }
+}
+````
+
+That uses a `BookDto` defined as shown:
+
+```csharp
+using System;
+using Volo.Abp.Application.Dtos;
+
+namespace AngularProxyDemo.Books
+{
+    public class BookDto : EntityDto<Guid>
+    {
+        public string Name { get; set; }
+
+        public DateTime PublishDate { get; set; }
+    }
+}
+```
+
+And implemented as the following:
+
+```csharp
+using System;
+using System.Collections.Generic;
+using System.Threading.Tasks;
+using Volo.Abp.Application.Services;
+
+namespace AngularProxyDemo.Books
+{
+    public class BookAppService : ApplicationService, IBookAppService
+    {
+        public async Task<List<BookDto>> GetListAsync()
+        {
+            //TODO: get books from a database...
+        }
+    }
+}
+```
+
+It simply returns a list of books. You probably want to get the books from a database, but it doesn't matter for this article.
+
+### HTTP API
+
+Thanks to the conventional API controllers system of the ABP Framework, we don't have too develop API controllers manually. Just **run the backend (*HttpApi.Host*) application** that shows the [Swagger UI](https://swagger.io/tools/swagger-ui/) by default. You will see the GET API for the books:
+
+![swagger-book-list](swagger-book-list.png)
+
+### Service Proxy Generation
+
+Open a command line in the root folder of the Angular application and execute the following command:
+
+````bash
+abp generate-proxy
+````
+
+It should produce an output like the following:
+
+````bash
+CREATE src/app/shared/models/books/index.ts (142 bytes)
+CREATE src/app/shared/services/books/book.service.ts (437 bytes)
+...
+````
+
+> `generate-proxy` command can take some some optional parameters for advanced scenarios (like [modular development](https://docs.abp.io/en/abp/latest/Module-Development-Basics)). You can take a look at the [documentation](https://docs.abp.io/en/abp/latest/UI/Angular/Service-Proxies).
+
+It basically creates two files;
+
+src/app/shared/services/books/**book.service.ts**: This is the service that can be injected and used to get the list of books;
+
+````typescript
+import { RestService } from '@abp/ng.core';
+import { Injectable } from '@angular/core';
+import type { BookDto } from '../../models/book';
+
+@Injectable({
+  providedIn: 'root',
+})
+export class BookService {
+  apiName = 'Default';
+
+  getList = () =>
+    this.restService.request<any, BookDto[]>({
+      method: 'GET',
+      url: `/api/app/book`,
+    },
+    { apiName: this.apiName });
+
+  constructor(private restService: RestService) {}
+}
+
+````
+
+src/app/shared/models/books/**index.ts**: This file contains the modal classes corresponding to the DTOs defined in the server side;
+
+````typescript
+import type { EntityDto } from '@abp/ng.core';
+
+export interface BookDto extends EntityDto<string> {
+  name: string;
+  publishDate: string;
+}
+````
+
+You can now inject the `BookService` into any Angular component and use the `getList()` method to get the list of books.
+
+### About the Generated Code
+
+The generated code is;
+
+* **Simple**: It is almost identical to the code if you've written it yourself.
+* **Splitted**: Instead of a single, large file;
+  * It creates a separate `.ts` file for every backend **service**. **Model** (DTO) classes are also grouped per service.
+  * It understands the [modularity](https://docs.abp.io/en/abp/latest/Module-Development-Basics), so creates the services for your own **module** (or the module you've specified).
+* **Object oriented**;
+  * Supports **inheritance** of server side DTOs and generates the code respecting to the inheritance structure.
+  * Supports **generic types**.
+  * Supports **re-using type definitions** across services and doesn't generate the same DTO multiple times.
+* **Well-aligned to the backend**;
+  * Service **method signatures** match exactly with the services on the backend services. This is achieved by a special endpoint exposed by the ABP Framework that well defines the backend contracts.
+  * **Namespaces** are exactly matches to the backend services and DTOs.
+* **Well-aligned with the ABP Framework**;
+  * Recognizes the **standard ABP Framework DTO types** (like `EntityDto`, `ListResultDto`... etc) and doesn't repeat these classes in the application code, but uses from the `@abp/ng.core` package.
+  * Uses the `RestService` defined by the `@abp/ng.core` package which simplifies the generated code, keeps it short and re-uses all the logics implemented by the `RestService` (including error handling, authorization token injection, using multiple server endpoints... etc).
+
+These are the main motivations behind the decision of creating a service proxy generation system, instead of using a pre-built tool like [NSWAG](https://github.com/RicoSuter/NSwag).
+
+## Other Examples
+
+Let me show you a few more examples.
+
+### Updating an Entity
+
+Assume that you added a new method to the server side application service, to update a book:
+
+```csharp
+public Task<BookDto> UpdateAsync(Guid id, BookUpdateDto input);
+```
+
+`BookUpdateDto` is a simple class defined shown below:
+
+```csharp
+using System;
+
+namespace AngularProxyDemo.Books
+{
+    public class BookUpdateDto
+    {
+        public string Name { get; set; }
+
+        public DateTime PublishDate { get; set; }
+    }
+}
+```
+
+Let's re-run the `generate-proxy` command to see the result:
+
+````
+abp generate-proxy
+````
+
+The output of this command will be like the following:
+
+````bash
+UPDATE src/app/shared/services/books/book.service.ts (660 bytes)
+UPDATE src/app/shared/models/books/index.ts (217 bytes)
+````
+
+It tells us two files have been updated. Let's see the changes;
+
+**book.service.ts**
+
+````typescript
+import { RestService } from '@abp/ng.core';
+import { Injectable } from '@angular/core';
+import type { BookDto, BookUpdateDto } from '../../models/books';
+
+@Injectable({
+  providedIn: 'root',
+})
+export class BookService {
+  apiName = 'Default';
+
+  getList = () =>
+    this.restService.request<any, BookDto[]>({
+      method: 'GET',
+      url: `/api/app/book`,
+    },
+    { apiName: this.apiName });
+
+  update = (id: string, input: BookUpdateDto) =>
+    this.restService.request<any, BookDto>({
+      method: 'PUT',
+      url: `/api/app/book/${id}`,
+      body: input,
+    },
+    { apiName: this.apiName });
+
+  constructor(private restService: RestService) {}
+}
+````
+
+`update` function has been added to the `BookService` that gets an `id` and a `BookUpdateDto` as the parameters.
+
+**index.ts**
+
+````typescript
+import type { EntityDto } from '@abp/ng.core';
+
+export interface BookDto extends EntityDto<string> {
+  name: string;
+  publishDate: string;
+}
+
+export interface BookUpdateDto {
+  name: string;
+  publishDate: string;
+}
+````
+
+Added a new DTO class: `BookUpdateDto`.
+
+### Advanced Example
+
+In this example, I want to show a DTO structure using inheritance, generics, arrays and dictionaries.
+
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