{"id":39060,"date":"2025-06-03T15:05:55","date_gmt":"2025-06-03T09:35:55","guid":{"rendered":"https:\/\/mobisoftinfotech.com\/resources\/?p=39060"},"modified":"2025-10-15T15:50:54","modified_gmt":"2025-10-15T10:20:54","slug":"flutter-dio-tutorial-http-client","status":"publish","type":"post","link":"https:\/\/mobisoftinfotech.com\/resources\/blog\/flutter-development\/flutter-dio-tutorial-http-client","title":{"rendered":"Flutter Dio Tutorial: The Ultimate HTTP Client for Flutter Development"},"content":{"rendered":"<h2 class=\"wp-block-heading\">Introduction<\/h2>\n\n\n\n<p>Dio is an HTTP client for Dart that makes it easy to work with APIs and perform HTTP requests in Flutter. It is built on top of the Dart HttpClient, with added features that make it more powerful and flexible for handling Flutter networking.<\/p>\n\n\n\n<p><strong>The features are listed below:<\/strong><\/p>\n\n\n\n<h4 class=\"wp-block-heading h4-list\"><strong>Simple and expressive API for making various HTTP requests&nbsp;<\/strong><\/h4>\n\n\n\n<p>Whether you need to perform GET, POST, PUT, DELETE, or other types of requests, Dio in Flutter has got you covered.<\/p>\n\n\n\n<h4 class=\"wp-block-heading h4-list\"><strong>Built in support for interceptors to modify request and response data<\/strong><\/h4>\n\n\n\n<p>Interceptors in Dio let you modify requests and responses, perfect for adding headers, logging, handling auth, or custom pre\/post-processing.<\/p>\n\n\n\n<h4 class=\"wp-block-heading h4-list\"><strong>Support for sending form data, JSON, and handling multipart requests<\/strong><\/h4>\n\n\n\n<p>Dio makes sending form data, JSON, and multipart requests (like file uploads) simple and efficient.<\/p>\n\n\n\n<h4 class=\"wp-block-heading h4-list\"><strong>Cancellation of ongoing requests for efficient resource management<\/strong><\/h4>\n\n\n\n<p>Flutter Dio lets you easily cancel HTTP requests, saving resources and boosting app performance.<\/p>\n\n\n\n<h4 class=\"wp-block-heading h4-list\"><strong>Efficient handling of timeouts and retries for enhanced reliability<\/strong><\/h4>\n\n\n\n<p>Dio handles timeouts and retries, ensuring smooth responses even with delays or failed requests.<\/p>\n\n\n\n<h4 class=\"wp-block-heading h4-list\"><strong>Global configuration options for customizing client behaviour<\/strong><\/h4>\n\n\n\n<p>Dio supports global settings like base URLs and headers, reducing code duplication across requests.<\/p>\n\n\n\n<p>And much more!<\/p>\n\n\n\n<p>Let\u2019s explore how to use Dio in a Flutter application and take a look at some of its features in what can be seen as a complete Flutter Dio tutorial for API integration.&nbsp;<\/p>\n\n\n\n<p>These features make Flutter Dio a great choice for businesses that<a href=\"https:\/\/mobisoftinfotech.com\/services\/hire-flutter-developers?utm_source=blog&amp;utm_campaign=flutter-dio\"> hire Flutter developers<\/a> to build scalable and efficient applications.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><a href=\"https:\/\/mobisoftinfotech.com\/services\/flutter-app-development-company?utm_source=blog&amp;utm_medium=flutter-dio-tutorial-http-client-cta1 \"><noscript><img decoding=\"async\" width=\"855\" height=\"363\" src=\"https:\/\/mobisoftinfotech.com\/resources\/wp-content\/uploads\/2025\/06\/flutter-dio-growth-cta.png\" alt=\"CTA image for Flutter app that accelerates growth\" class=\"wp-image-39068\" title=\"Grow with Flutter Apps\"><\/noscript><img decoding=\"async\" width=\"855\" height=\"363\" src=\"data:image\/svg+xml,%3Csvg%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%20viewBox%3D%220%200%20855%20363%22%3E%3C%2Fsvg%3E\" alt=\"CTA image for Flutter app that accelerates growth\" class=\"wp-image-39068 lazyload\" title=\"Grow with Flutter Apps\" data-src=\"https:\/\/mobisoftinfotech.com\/resources\/wp-content\/uploads\/2025\/06\/flutter-dio-growth-cta.png\"><\/a><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Step 1: Installing Dio<\/strong><\/h2>\n\n\n\n<p>To use the Dio Flutter package in a Flutter application, first add the package to your project. You can do this by adding the following line to your pubspec.yaml file:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-1\" data-shcb-language-name=\"CSS\" data-shcb-language-slug=\"css\"><span><code class=\"hljs language-css\"><span class=\"hljs-selector-tag\">dio<\/span>: ^5<span class=\"hljs-selector-class\">.8<\/span><span class=\"hljs-selector-class\">.0<\/span>+1<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-1\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">CSS<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">css<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>After adding the package to your project, run flutter pub get to install it. This completes the basic Flutter Dio setup.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Step 2: Making HTTP Requests with Dio<\/strong><\/h2>\n\n\n\n<p>In order to explore all the methods of Dio, we will make a simple ui with all method options available in the form as buttons, and on each button click, we will make a respective API hit.<\/p>\n\n\n\n<p>Let&#8217;s explore the GET, POST, PUT, PATCH, DELETE, and GET with Cache requests to fetch data from APIs. We&#8217;ll use the &#8220;<a href=\"http:\/\/jsonplaceholder.typicode.com\/\" target=\"_blank\" rel=\"noreferrer noopener\">jsonplaceholder.typicode.com <\/a>&#8221; service, which provides mock JSON data for testing purposes. We&#8217;ll retrieve a list of posts and display their title, body, and id. Here&#8217;s how you can do it:<\/p>\n\n\n\n<h4 class=\"wp-block-heading\"><strong>Let\u2019s first create our Post model:<\/strong><\/h4>\n\n\n\n<p>This class represents a post object with attributes userId, id, title, and body. We defined a factory constructor from Jason to convert JSON data into a Post object.<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-2\" data-shcb-language-name=\"JavaScript\" data-shcb-language-slug=\"javascript\"><span><code class=\"hljs language-javascript\"><span class=\"hljs-class\"><span class=\"hljs-keyword\">class<\/span> <span class=\"hljs-title\">Post<\/span> <\/span>{\n  final int userId;\n  final int id;\n  final <span class=\"hljs-built_in\">String<\/span> title;\n  final <span class=\"hljs-built_in\">String<\/span> body;\n  Post({\n    required <span class=\"hljs-keyword\">this<\/span>.userId,\n    required <span class=\"hljs-keyword\">this<\/span>.id,\n    required <span class=\"hljs-keyword\">this<\/span>.title,\n    required <span class=\"hljs-keyword\">this<\/span>.body,\n  });\n  factory Post.fromJson(<span class=\"hljs-built_in\">Map<\/span>&lt;<span class=\"hljs-built_in\">String<\/span>, dynamic&gt; json) {\n    <span class=\"hljs-keyword\">return<\/span> Post(\n      userId: json&#091;<span class=\"hljs-string\">'userId'<\/span>] ?? <span class=\"hljs-number\">0<\/span>,\n      <span class=\"hljs-attr\">id<\/span>: json&#091;<span class=\"hljs-string\">'id'<\/span>] ?? <span class=\"hljs-number\">0<\/span>,\n      <span class=\"hljs-attr\">title<\/span>: json&#091;<span class=\"hljs-string\">'title'<\/span>] ?? <span class=\"hljs-string\">''<\/span>,\n      <span class=\"hljs-attr\">body<\/span>: json&#091;<span class=\"hljs-string\">'body'<\/span>] ?? <span class=\"hljs-string\">''<\/span>,\n    );\n  }}<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-2\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">JavaScript<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">javascript<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<h3 class=\"wp-block-heading\"><strong>Create Dio Client<\/strong><\/h3>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-3\" data-shcb-language-name=\"JavaScript\" data-shcb-language-slug=\"javascript\"><span><code class=\"hljs language-javascript\"><span class=\"hljs-keyword\">void<\/span>  _createDioClient(){\n   dio = Dio(BaseOptions(baseUrl: <span class=\"hljs-string\">'https:\/\/jsonplaceholder.typicode.com'<\/span>));\n   _addInterceptor();\n }<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-3\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">JavaScript<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">javascript<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p><strong>Let\u2019s understand the block:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>This line creates a new instance of the Dio HTTP client.<\/li>\n\n\n\n<li>It initializes it with BaseOptions, setting the base URL for all HTTP requests.<\/li>\n\n\n\n<li>Then we are calling the _addInterceptor() function, which adds interceptors to the Dio instance.<\/li>\n<\/ul>\n\n\n\n<p>If you&#8217;re aiming to build scalable, robust applications using Flutter Dio or any advanced networking solution, consider collaborating with expert<a href=\"https:\/\/mobisoftinfotech.com\/services\/flutter-app-development-company?utm_source=blog&amp;utm_medium=internal_link&amp;utm_campaign=flutter-dio_blog&amp;utm_content=flutter-app-development-company\"> Flutter app development services<\/a> to maximize the potential of your mobile product.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><noscript><img decoding=\"async\" width=\"855\" height=\"460\" src=\"https:\/\/mobisoftinfotech.com\/resources\/wp-content\/uploads\/2025\/06\/flutter-dio-architecture-diagram.png\" alt=\"Flutter Dio architecture diagram for HTTP requests\" class=\"wp-image-39069\" title=\"Architecture of Flutter Dio HTTP Client\"><\/noscript><img decoding=\"async\" width=\"855\" height=\"460\" src=\"data:image\/svg+xml,%3Csvg%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%20viewBox%3D%220%200%20855%20460%22%3E%3C%2Fsvg%3E\" alt=\"Flutter Dio architecture diagram for HTTP requests\" class=\"wp-image-39069 lazyload\" title=\"Architecture of Flutter Dio HTTP Client\" data-src=\"https:\/\/mobisoftinfotech.com\/resources\/wp-content\/uploads\/2025\/06\/flutter-dio-architecture-diagram.png\"><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Sending a GET Request with Dio<\/strong><\/h3>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-4\" data-shcb-language-name=\"JavaScript\" data-shcb-language-slug=\"javascript\"><span><code class=\"hljs language-javascript\"><span class=\"hljs-keyword\">void<\/span> _getPosts() <span class=\"hljs-keyword\">async<\/span> {\n  <span class=\"hljs-keyword\">try<\/span> {\n    final response = <span class=\"hljs-keyword\">await<\/span> dio.get(<span class=\"hljs-string\">'\/posts'<\/span>);\n    List&lt;Post&gt; posts = (response.data <span class=\"hljs-keyword\">as<\/span> List)\n        .map(<span class=\"hljs-function\">(<span class=\"hljs-params\">json<\/span>) =&gt;<\/span> Post.fromJson(json))\n        .toList();\n     _navigateToScreen(context, PostListScreen(posts: posts));\n\n  } <span class=\"hljs-keyword\">catch<\/span> (e) {\n   _navigateWithResult(<span class=\"hljs-string\">'GET Error: $e'<\/span>);\n  }\n}<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-4\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">JavaScript<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">javascript<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<h5 class=\"wp-block-heading\"><strong>Now, let us understand the code block.<\/strong><\/h5>\n\n\n\n<p>This asynchronous method uses the Dio package to make a GET request to the API. We await the response from the API and parse the JSON data into a list of Post objects.&nbsp;<\/p>\n\n\n\n<p>Finally, we use&nbsp; _navigateToScreen to display our API response in a new screen, here&nbsp; PostListScreen.<\/p>\n\n\n\n<p>The GET request retrieves posts and displays them in a list, a key feature in many<a href=\"https:\/\/mobisoftinfotech.com\/services\/mobile-app-development-company?utm_source=blog&amp;utm_campaign=flutter-dio_blog\"> mobile app development services<\/a>.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Sending a POST Request with Dio<\/strong><\/h3>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-5\" data-shcb-language-name=\"JavaScript\" data-shcb-language-slug=\"javascript\"><span><code class=\"hljs language-javascript\"><span class=\"hljs-keyword\">void<\/span> _makePost() <span class=\"hljs-keyword\">async<\/span> {\n\u2026\n      final response = <span class=\"hljs-keyword\">await<\/span> dio.post(<span class=\"hljs-string\">'\/posts'<\/span>, <span class=\"hljs-attr\">data<\/span>: {\n        <span class=\"hljs-string\">'title'<\/span>: _titleController.text,\n        <span class=\"hljs-string\">'body'<\/span>: _bodyController.text,\n        <span class=\"hljs-string\">'userId'<\/span>: <span class=\"hljs-number\">1<\/span>,\n      });\n      final post = Post.fromJson(response.data);\n    \u2026\n}\n<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-5\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">JavaScript<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">javascript<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<h4 class=\"wp-block-heading\"><strong>What the code specifies:<\/strong><\/h4>\n\n\n\n<p>This asynchronous method uses the Dio package to make a POST request to the API. We await the response from the API and parse the JSON data into a Post object.&nbsp;<\/p>\n\n\n\n<p>Finally,&nbsp; the response fetched from the API is shown on a new screen with the details entered in the textfields while making a POST request, and the&nbsp; userId for now has been hardcoded to 1<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Sending a PUT Request with Dio<\/strong><\/h3>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-6\" data-shcb-language-name=\"JavaScript\" data-shcb-language-slug=\"javascript\"><span><code class=\"hljs language-javascript\"><span class=\"hljs-keyword\">void<\/span> _updatePost() <span class=\"hljs-keyword\">async<\/span> {\n  <span class=\"hljs-keyword\">try<\/span> {\n    final response = <span class=\"hljs-keyword\">await<\/span> dio.put(<span class=\"hljs-string\">'\/posts\/1'<\/span>, <span class=\"hljs-attr\">data<\/span>: {\n      <span class=\"hljs-string\">'title'<\/span>: <span class=\"hljs-string\">'updated title'<\/span>,\n      <span class=\"hljs-string\">'body'<\/span>: <span class=\"hljs-string\">'updated body'<\/span>,\n      <span class=\"hljs-string\">'userId'<\/span>: <span class=\"hljs-number\">1<\/span>,\n    });\n _navigateWithResult(response.data.toString());\n  } <span class=\"hljs-keyword\">catch<\/span> (e) {\n  _navigateWithResult(<span class=\"hljs-string\">'PUT Error: $e'<\/span>);\n  }\n}<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-6\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">JavaScript<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">javascript<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<h4 class=\"wp-block-heading\"><strong>Understand the code block:<\/strong><\/h4>\n\n\n\n<ol class=\"wp-block-list\">\n<li>This is a function that works asynchronously and sends a PUT request to the API with the endpoint pointing to&nbsp; \/posts\/1<\/li>\n\n\n\n<li>We will be updating the post at index 1 with an updated title and updated body, respectively.<\/li>\n<\/ol>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Sending a PATCH Request with Dio<\/strong><\/h3>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-7\" data-shcb-language-name=\"JavaScript\" data-shcb-language-slug=\"javascript\"><span><code class=\"hljs language-javascript\"><span class=\"hljs-keyword\">void<\/span> _performPatch() <span class=\"hljs-keyword\">async<\/span> {\n  <span class=\"hljs-keyword\">try<\/span> {\n    final response = <span class=\"hljs-keyword\">await<\/span> dio.patch(<span class=\"hljs-string\">'\/posts\/1'<\/span>, <span class=\"hljs-attr\">data<\/span>: {\n      <span class=\"hljs-string\">'title'<\/span>: <span class=\"hljs-string\">'patched title'<\/span>,\n    });\n _navigateWithResult(response.data.toString());\n\n  } <span class=\"hljs-keyword\">catch<\/span> (e) {\n  _navigateWithResult(<span class=\"hljs-string\">'PATCH Error: $e'<\/span>);\n\n  }\n}<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-7\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">JavaScript<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">javascript<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<h5 class=\"wp-block-heading\"><strong>Let\u2019s understand the block.<\/strong><\/h5>\n\n\n\n<ol class=\"wp-block-list\">\n<li>This is a function that works asynchronously and sends a PATCH request to the API&nbsp; with endpoint \/posts\/1<\/li>\n\n\n\n<li>It updates just the title of that post.<\/li>\n\n\n\n<li>It waits for the server to respond.<\/li>\n\n\n\n<li>If the update works, it shows the response using a function called _navigateWithResult.<\/li>\n\n\n\n<li>If something goes wrong, it shows an error message instead of using a function called _navigateWithResult.<\/li>\n<\/ol>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Sending a DELETE Request with Dio<\/strong><\/h3>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-8\" data-shcb-language-name=\"JavaScript\" data-shcb-language-slug=\"javascript\"><span><code class=\"hljs language-javascript\"><span class=\"hljs-keyword\">void<\/span> _deletePost() <span class=\"hljs-keyword\">async<\/span> {\n  <span class=\"hljs-keyword\">try<\/span> {\n    final response = <span class=\"hljs-keyword\">await<\/span> dio.delete(<span class=\"hljs-string\">'\/posts\/1'<\/span>);\n    _navigateWithResult(<span class=\"hljs-string\">'DELETE successful with status code: ${response.statusCode}'<\/span>);\n_navigateWithResult(<span class=\"hljs-string\">'DELETE successful with status code: ${response.statusCode}'<\/span>);\n  } <span class=\"hljs-keyword\">catch<\/span> (e) {\n_navigateWithResult(<span class=\"hljs-string\">'DELETE Error: $e'<\/span>);\n\n  }\n}<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-8\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">JavaScript<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">javascript<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<h4 class=\"wp-block-heading\"><strong>Let\u2019s understand the code:<\/strong><\/h4>\n\n\n\n<ol class=\"wp-block-list\">\n<li>The dio. delete is used to delete the post with the ID.<\/li>\n\n\n\n<li>await waits for the server to reply.<\/li>\n\n\n\n<li>If the delete is successful, this shows a message with a status code.<\/li>\n\n\n\n<li>If something goes wrong, it shows an error message instead of using a function called _navigateWithResult.<\/li>\n<\/ol>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Sending a GET with a Cache Request with Dio<\/strong><\/h3>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-9\" data-shcb-language-name=\"JavaScript\" data-shcb-language-slug=\"javascript\"><span><code class=\"hljs language-javascript\"><span class=\"hljs-keyword\">void<\/span> _fetchCachedPost() <span class=\"hljs-keyword\">async<\/span> {\n  <span class=\"hljs-keyword\">const<\/span> key = <span class=\"hljs-string\">'posts\/1'<\/span>;\n  <span class=\"hljs-keyword\">if<\/span> (cache.containsKey(key)) {\n    _navigateWithResult(<span class=\"hljs-string\">'From Cache:\\n${cache&#091;key]}'<\/span>);\n    <span class=\"hljs-keyword\">return<\/span>;\n  }\n  <span class=\"hljs-keyword\">try<\/span> {\n    final response = <span class=\"hljs-keyword\">await<\/span> dio.get(<span class=\"hljs-string\">'\/posts\/1'<\/span>);\n    cache&#091;key] = response.data.toString();\n    _navigateWithResult(<span class=\"hljs-string\">'From Network:\\n${response.data}'<\/span>);\n  } <span class=\"hljs-keyword\">catch<\/span> (e) {\n    _navigateWithResult(<span class=\"hljs-string\">'Cache GET Error: $e'<\/span>);\n  }\n}<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-9\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">JavaScript<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">javascript<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<h4 class=\"wp-block-heading\"><strong>Let\u2019s understand the code:<\/strong><\/h4>\n\n\n\n<ol class=\"wp-block-list\">\n<li>It tries to get data from an API, but uses a cache to avoid making the same request multiple times.<\/li>\n\n\n\n<li>It checks if we already have the data stored in memory.<\/li>\n\n\n\n<li>If it&#8217;s not cached:<\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>It makes a network request.<\/li>\n\n\n\n<li>Saves the data in the cache<\/li>\n\n\n\n<li>Shows the result using the function _navigateWithResult<\/li>\n<\/ul>\n\n\n\n<ol start=\"4\" class=\"wp-block-list\">\n<li>If something goes wrong, then the error is shown using the function&nbsp; _navigateWithResult<\/li>\n<\/ol>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Steps to test the cache request<\/strong><\/h2>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Step 1: Test First Time Request (No Cache)<\/strong><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Call the function:<br>_fetchCachedPost();&nbsp;<\/li>\n\n\n\n<li>It gets data from the network and stores it in the cache<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Step 2: Test Cache Hit (Subsequent Request)<\/strong><\/h3>\n\n\n\n<p><strong>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<\/strong>It returns the data from the cache; no network call is made.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Customizing Flutter Dio with Interceptors<\/strong><\/h2>\n\n\n\n<p>Interceptors in Dio let you intercept and modify requests or responses. They&#8217;re useful for adding headers, logging, handling auth, or custom processing.<\/p>\n\n\n\n<p>We will check how to add Interceptors now.<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-10\" data-shcb-language-name=\"PHP\" data-shcb-language-slug=\"php\"><span><code class=\"hljs language-php\">void _addInterceptor() {\n     dio.interceptors.add(\n    InterceptorsWrapper(\n      onRequest: (options, handler) {\n        <span class=\"hljs-keyword\">print<\/span>(<span class=\"hljs-string\">\" Request: ${options.uri}\"<\/span>);\n        <span class=\"hljs-keyword\">return<\/span> handler.next(options);\n      },\n      onResponse: (response, handler) {\n        <span class=\"hljs-keyword\">print<\/span>(<span class=\"hljs-string\">\" Response: ${response.statusCode}\"<\/span>);\n        <span class=\"hljs-keyword\">return<\/span> handler.next(response);\n      },\n      onError: (DioError e, handler) {\n        <span class=\"hljs-keyword\">print<\/span>(<span class=\"hljs-string\">\" Interceptor error: ${e.message}\"<\/span>);\n        <span class=\"hljs-keyword\">return<\/span> handler.next(e);\n      },\n    ),\n  );\n}<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-10\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">PHP<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">php<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<h5 class=\"wp-block-heading\">We will understand the code.&nbsp;<\/h5>\n\n\n\n<p>In this example, we add an interceptor to our Dio client using dio.interceptors.add() with a custom InterceptorsWrapper. This wrapper lets us define functions for onRequest, onResponse, and onError, which are triggered at different points in the request lifecycle.<\/p>\n\n\n\n<p>These functions allow us to perform tasks like logging request\/response details, handling errors, or adding headers automatically.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><noscript><img decoding=\"async\" width=\"855\" height=\"460\" src=\"https:\/\/mobisoftinfotech.com\/resources\/wp-content\/uploads\/2025\/06\/flutter-dio-error-handling-flow.png\" alt=\"Flutter Dio error handling flowchart\" class=\"wp-image-39070\" title=\"Dio Error Handling in Flutter\"><\/noscript><img decoding=\"async\" width=\"855\" height=\"460\" src=\"data:image\/svg+xml,%3Csvg%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%20viewBox%3D%220%200%20855%20460%22%3E%3C%2Fsvg%3E\" alt=\"Flutter Dio error handling flowchart\" class=\"wp-image-39070 lazyload\" title=\"Dio Error Handling in Flutter\" data-src=\"https:\/\/mobisoftinfotech.com\/resources\/wp-content\/uploads\/2025\/06\/flutter-dio-error-handling-flow.png\"><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Key Parts of the Code:<\/strong><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>dio Object:<\/strong> An instance of Dio in Flutter used for making HTTP requests. We attach our interceptors to it using dio.interceptors.add(), a common practice in Flutter Dio configuration.<br><\/li>\n\n\n\n<li>We have methods defined in this InterceptorsWrapper as:\n<ul class=\"wp-block-list\">\n<li><strong>onRequest<\/strong>: Runs before the request is sent.<br>&nbsp; For example, we can use this method for sending an authorization token once the user is authenticated.<\/li>\n\n\n\n<li><strong>onResponse<\/strong>: Runs after receiving a response.<br>For example,&nbsp; we can use this method for logging the response, status code.<\/li>\n\n\n\n<li><strong>onError<\/strong>: Runs when an error occurs during the request.&nbsp;<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n\n<p>&nbsp;&nbsp;For example, we can handle different error types and display them to users.<\/p>\n\n\n\n<p>This setup helps centralize request handling logic, making your code cleaner and more maintainable, especially in Flutter API integration projects.<br>Once all the code blocks are written, we can now run and check the app, an ideal way to test Flutter Dio examples in action. The result is how it looks on the emulator.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><noscript><img decoding=\"async\" width=\"855\" height=\"460\" src=\"https:\/\/mobisoftinfotech.com\/resources\/wp-content\/uploads\/2025\/06\/flutter-dio-emulator-output.png\" alt=\"Flutter Dio API client running on emulator\" class=\"wp-image-39071\" title=\" Flutter Dio UI Emulator Output\"><\/noscript><img decoding=\"async\" width=\"855\" height=\"460\" src=\"data:image\/svg+xml,%3Csvg%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%20viewBox%3D%220%200%20855%20460%22%3E%3C%2Fsvg%3E\" alt=\"Flutter Dio API client running on emulator\" class=\"wp-image-39071 lazyload\" title=\" Flutter Dio UI Emulator Output\" data-src=\"https:\/\/mobisoftinfotech.com\/resources\/wp-content\/uploads\/2025\/06\/flutter-dio-emulator-output.png\"><\/figure>\n\n\n\n<p>Now let\u2019s see each option on the virtual device.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\"><strong>1. When the GET button is clicked&nbsp;<\/strong><\/h4>\n\n\n\n<p>It should display a scrollable list of posts. This showcases the <strong>Flutter Dio GET request<\/strong> implementation.<br><\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><noscript><img decoding=\"async\" width=\"855\" height=\"460\" src=\"https:\/\/mobisoftinfotech.com\/resources\/wp-content\/uploads\/2025\/06\/flutter-dio-get-request.png\" alt=\"GET request result using Dio in Flutter\" class=\"wp-image-39072\" title=\"Flutter Dio GET Request\"><\/noscript><img decoding=\"async\" width=\"855\" height=\"460\" src=\"data:image\/svg+xml,%3Csvg%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%20viewBox%3D%220%200%20855%20460%22%3E%3C%2Fsvg%3E\" alt=\"GET request result using Dio in Flutter\" class=\"wp-image-39072 lazyload\" title=\"Flutter Dio GET Request\" data-src=\"https:\/\/mobisoftinfotech.com\/resources\/wp-content\/uploads\/2025\/06\/flutter-dio-get-request.png\"><\/figure>\n\n\n\n<h4 class=\"wp-block-heading\"><strong>2. When the POST button is clicked<\/strong><\/h4>\n\n\n\n<p>A screen should appear that accepts title and body as inputs, and on the Add Post button, creates a POST request with a separate screen rendered for input entered.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><noscript><img decoding=\"async\" width=\"855\" height=\"378\" src=\"https:\/\/mobisoftinfotech.com\/resources\/wp-content\/uploads\/2025\/06\/flutter-dio-post-request.png\" alt=\"POST request in Flutter Dio with form inputs\" class=\"wp-image-39073\" title=\"Flutter Dio POST Request\"><\/noscript><img decoding=\"async\" width=\"855\" height=\"378\" src=\"data:image\/svg+xml,%3Csvg%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%20viewBox%3D%220%200%20855%20378%22%3E%3C%2Fsvg%3E\" alt=\"POST request in Flutter Dio with form inputs\" class=\"wp-image-39073 lazyload\" title=\"Flutter Dio POST Request\" data-src=\"https:\/\/mobisoftinfotech.com\/resources\/wp-content\/uploads\/2025\/06\/flutter-dio-post-request.png\"><\/figure>\n\n\n\n<h4 class=\"wp-block-heading\"><strong>3. Let us hit the PUT button and check the output<\/strong><\/h4>\n\n\n\n<p>It displays the updated title and body for resp. Post with id as 1<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><noscript><img decoding=\"async\" width=\"855\" height=\"320\" src=\"https:\/\/mobisoftinfotech.com\/resources\/wp-content\/uploads\/2025\/06\/flutter-dio-put-request.png\" alt=\"PUT request result in Flutter Dio updating a post\" class=\"wp-image-39074\" title=\"Flutter Dio PUT Request\"><\/noscript><img decoding=\"async\" width=\"855\" height=\"320\" src=\"data:image\/svg+xml,%3Csvg%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%20viewBox%3D%220%200%20855%20320%22%3E%3C%2Fsvg%3E\" alt=\"PUT request result in Flutter Dio updating a post\" class=\"wp-image-39074 lazyload\" title=\"Flutter Dio PUT Request\" data-src=\"https:\/\/mobisoftinfotech.com\/resources\/wp-content\/uploads\/2025\/06\/flutter-dio-put-request.png\"><\/figure>\n\n\n\n<h4 class=\"wp-block-heading\"><strong>4. Now let\u2019s try the PATCH button&nbsp;<\/strong><\/h4>\n\n\n\n<p>As we can see, it has updated the title which we have provided while making an API hit, and displayed the body as it is.&nbsp;<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><noscript><img decoding=\"async\" width=\"855\" height=\"320\" src=\"https:\/\/mobisoftinfotech.com\/resources\/wp-content\/uploads\/2025\/06\/flutter-dio-patch-request.png\" alt=\"PATCH request in Flutter Dio updating post title\" class=\"wp-image-39075\" title=\"Flutter Dio PATCH Request\"><\/noscript><img decoding=\"async\" width=\"855\" height=\"320\" src=\"data:image\/svg+xml,%3Csvg%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%20viewBox%3D%220%200%20855%20320%22%3E%3C%2Fsvg%3E\" alt=\"PATCH request in Flutter Dio updating post title\" class=\"wp-image-39075 lazyload\" title=\"Flutter Dio PATCH Request\" data-src=\"https:\/\/mobisoftinfotech.com\/resources\/wp-content\/uploads\/2025\/06\/flutter-dio-patch-request.png\"><\/figure>\n\n\n\n<h4 class=\"wp-block-heading\">5. <strong>Let\u2019s try the DELETE button<\/strong><\/h4>\n\n\n\n<p>After a successful delete, we have printed the status code of the operation, which is what is being displayed.&nbsp;<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><noscript><img decoding=\"async\" width=\"855\" height=\"320\" src=\"https:\/\/mobisoftinfotech.com\/resources\/wp-content\/uploads\/2025\/06\/flutter-dio-delete-request.png\" alt=\"DELETE request using Dio to remove a post\" class=\"wp-image-39076\" title=\"Flutter Dio DELETE Request\"><\/noscript><img decoding=\"async\" width=\"855\" height=\"320\" src=\"data:image\/svg+xml,%3Csvg%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%20viewBox%3D%220%200%20855%20320%22%3E%3C%2Fsvg%3E\" alt=\"DELETE request using Dio to remove a post\" class=\"wp-image-39076 lazyload\" title=\"Flutter Dio DELETE Request\" data-src=\"https:\/\/mobisoftinfotech.com\/resources\/wp-content\/uploads\/2025\/06\/flutter-dio-delete-request.png\"><\/figure>\n\n\n\n<h4 class=\"wp-block-heading\">6. <strong>Let\u2019s try GET with Cache<\/strong><\/h4>\n\n\n\n<p>Here at first, an API hit will be made, and the data is stored in memory, and next time onwards it will load the data from the Cache.<\/p>\n\n\n\n<p>This improves maintainability by handling logs, tokens, or global headers centrally, a common strategy in enterprise level<a href=\"https:\/\/mobisoftinfotech.com\/services\/ui-ux-design?utm_source=blog&amp;utm_campaign=flutter-dio_blog\"> mobile app UI\/UX design<\/a> and development solutions.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><noscript><img decoding=\"async\" width=\"855\" height=\"378\" src=\"https:\/\/mobisoftinfotech.com\/resources\/wp-content\/uploads\/2025\/06\/flutter-dio-get-with-cache.png\" alt=\"Cached GET request using Dio in Flutter app\" class=\"wp-image-39077\" title=\"Flutter Dio Caching with GET\"><\/noscript><img decoding=\"async\" width=\"855\" height=\"378\" src=\"data:image\/svg+xml,%3Csvg%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%20viewBox%3D%220%200%20855%20378%22%3E%3C%2Fsvg%3E\" alt=\"Cached GET request using Dio in Flutter app\" class=\"wp-image-39077 lazyload\" title=\"Flutter Dio Caching with GET\" data-src=\"https:\/\/mobisoftinfotech.com\/resources\/wp-content\/uploads\/2025\/06\/flutter-dio-get-with-cache.png\"><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Summing It Up<\/strong><\/h2>\n\n\n\n<p>I hope you found this tutorial on implementing Flutter Dio in your apps useful. To download the source code for the sample app.<\/p>\n\n\n\n<p>You can find the complete Flutter Dio example in the GitHub repository <a href=\"https:\/\/github.com\/mobisoftinfotech\/flutter-dio-tutorial\" target=\"_blank\" rel=\"noreferrer noopener\">here<\/a><strong>.<\/strong><\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><a href=\"https:\/\/mobisoftinfotech.com\/contact-us?utm_source=blog&amp;utm_medium=flutter-dio-tutorial-http-client-cta2 \"><noscript><img decoding=\"async\" width=\"855\" height=\"363\" src=\"https:\/\/mobisoftinfotech.com\/resources\/wp-content\/uploads\/2025\/06\/flutter-dio-big-idea-cta.png\" alt=\"CTA for building innovative mobile apps with Flutter Dio\" class=\"wp-image-39078\" title=\"Build the Right Tech with Flutter\"><\/noscript><img decoding=\"async\" width=\"855\" height=\"363\" src=\"data:image\/svg+xml,%3Csvg%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%20viewBox%3D%220%200%20855%20363%22%3E%3C%2Fsvg%3E\" alt=\"CTA for building innovative mobile apps with Flutter Dio\" class=\"wp-image-39078 lazyload\" title=\"Build the Right Tech with Flutter\" data-src=\"https:\/\/mobisoftinfotech.com\/resources\/wp-content\/uploads\/2025\/06\/flutter-dio-big-idea-cta.png\"><\/a><\/figure>\n\n\n<div class=\"related-posts-section\"><h2>Related Posts<\/h2><ul class=\"related-posts-list\"><li><a href=\"https:\/\/mobisoftinfotech.com\/resources\/blog\/flutter-development\/build-nfc-reader-writer-app-flutter-nfc-manager\">Complete Guide to Building NFC Reader and Writer Apps in Flutter Using NFC Manager Package &#8211; Step-by-Step Tutorial<\/a><\/li><li><a href=\"https:\/\/mobisoftinfotech.com\/resources\/blog\/flutter-development\/flutter-isolates-background-processing\">Isolates in Flutter: Boost Performance with Background Processing<\/a><\/li><li><a href=\"https:\/\/mobisoftinfotech.com\/resources\/blog\/flutter-development\/mastering-inter-component-communication-flutter-mi-broadcast\">Mastering Inter-Component Communication in Flutter with MI Broadcast<\/a><\/li><li><a href=\"https:\/\/mobisoftinfotech.com\/resources\/blog\/flutter-development\/flutter-bluetooth-ble-integration-guide\">Flutter Bluetooth Tutorial: How to Implement Flutter BLE Support<\/a><\/li><li><a href=\"https:\/\/mobisoftinfotech.com\/resources\/blog\/flutter-development\/secure-flutter-biometric-authentication-fingerprint-face-id\">Secure Biometric Authentication in Flutter: Fingerprint &amp; Face ID Login Tutorial<\/a><\/li><li><a href=\"https:\/\/mobisoftinfotech.com\/resources\/blog\/flutter-development\/flutter-state-management-bloc-tutorial\">Flutter State Management Tutorial: How to Use BLoC for State Management in Flutter (Step-by-Step)<\/a><\/li><\/ul><\/div>\n\n\n<div class=\"modern-author-card\">\n    <div class=\"author-card-content\">\n        <div class=\"author-info-section\">\n            <div class=\"author-avatar\">\n                <noscript><img decoding=\"async\" src=\"https:\/\/mobisoftinfotech.com\/resources\/wp-content\/uploads\/2025\/06\/flutter-dio-tutorial-author-komal-Pardeshi.png\" alt=\"Komal Pardeshi\"><\/noscript><img decoding=\"async\" src=\"data:image\/gif;base64,R0lGODlhAQABAIAAAAAAAP\/\/\/yH5BAEAAAAALAAAAAABAAEAAAIBRAA7\" alt=\"Komal Pardeshi\" data-src=\"https:\/\/mobisoftinfotech.com\/resources\/wp-content\/uploads\/2025\/06\/flutter-dio-tutorial-author-komal-Pardeshi.png\" class=\" lazyload\">\n            <\/div>\n            <div class=\"author-details\">\n                <h3 class=\"author-name\">Komal Pardeshi<\/h3>\n                <p class=\"author-title\">Software Engineer<\/p>\n                <a href=\"javascript:void(0);\" class=\"read-more-link read-more-btn\" onclick=\"toggleAuthorBio(this); return false;\">Read more <noscript><img decoding=\"async\" src=\"\/assets\/images\/blog\/Vector.png\" alt=\"expand\" class=\"read-more-arrow down-arrow\"><\/noscript><img decoding=\"async\" src=\"data:image\/gif;base64,R0lGODlhAQABAIAAAAAAAP\/\/\/yH5BAEAAAAALAAAAAABAAEAAAIBRAA7\" alt=\"expand\" class=\"read-more-arrow down-arrow lazyload\" data-src=\"\/assets\/images\/blog\/Vector.png\"><\/a>\n                <div class=\"author-bio-expanded\">\n                    <p>Komal Pardeshi is a Software Engineer at <a href=\"https:\/\/mobisoftinfotech.com\">Mobisoft Infotech<\/a> with over 5 years of experience in designing, building mobile apps for Android.She is skilled in both native and cross-platform frameworks like Kotlin,Java,Flutter.She is deeply committed to continuous learning,constantly exploring new technologies, tools, framework.<\/p>\n                    <div class=\"author-social-links\"><div class=\"social-icon\"><a href=\"https:\/\/www.linkedin.com\/in\/komal-pardeshi-~-multiplatform-developer-47932556\/\" target=\"_blank\" rel=\"nofollow noopener\"><i class=\"icon-sprite linkedin\"><\/i><\/a><\/div><\/div>\n                    <a href=\"javascript:void(0);\" class=\"read-more-link read-less-btn\" onclick=\"toggleAuthorBio(this); 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The ultimate Flutter HTTP client guide for real world projects.\",\n  \"image\": \"https:\/\/mobisoftinfotech.com\/resources\/wp-content\/uploads\/2025\/06\/flutter-dio-tutorial-http-client\",\n  \"author\": {\n    \"@type\": \"Person\",\n    \"name\": \"Komal Pardeshi\",\n    \"description\": \"Komal Pardeshi is a Software Engineer at Mobisoft Infotech with over 5 years of experience in designing, building mobile apps for Android. She is skilled in both native and cross-platform frameworks like Kotlin, Java, Flutter. 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