Flutter - Making http calls using http and dio

Code snippets for making http requests using flutter or dio plugin.

February 26, 2026

Setup

we will be using http to make basic network calls for methods like GET, POST, DELETE and so on.

http: latest_version

Making a simple GET request

I will setup a simple class named APIService which contains all the methods for making requests.

 class APIService{
 
 }

I am not exclusively checking for internet availability using any package like connectivity plus. Will be handling errors here itself.

 class APIService{
 
  // baseurl for API
  String baseUrl = "http://10.0.2.2:5000";
 
    // returns a list of all posts as per my API
    // may use this in a futurebuilder
    Future<List> getPosts() async {
      try {
        var response = await http.get(Uri.parse(baseUrl));
        if (response.statusCode == 200) {
            // return a decoded body
          return jsonDecode(response.body);
        } else {
          // server error
          return Future.error("Server Error !");
        }
      } catch (SocketException) {
        // fetching error
        // may be timeout, no internet or dns not resolved
        return Future.error("Error Fetching Data !");
      }
    }
  }

POST with data

I will send post data to server with some json data. This api doesn't require any authentication hence no Bearer or auth token.

 Future<String> createPost(Map<String, dynamic> data) async {
     try {
       var response = await http.post(
         Uri.parse("$baseUrl/create"),
         body: jsonEncode(data),
         headers: {
           "Content-Type": "application/json; charset=UTF-8",
         },
       );
       if (response.statusCode == 200) {
         return "success";
       } else {
         print(response.body);
         // server error
         return "err";
       }
     } catch (SocketException) {
       // fetching error
       return "err";
     }
   }

The returned string can be used to show weather the post was created successfully or not.

Delete Request

Deleting a resource is also simple , make a request as per your API, mine expects a slug in the body, so doing that. Create a map/object of the data that you grab from a form or anything.

 Future<String> deletePost(Map<String, dynamic> data) async {
     try {
       var response = await http.delete(
         Uri.parse("$baseUrl/delete"),
         body: jsonEncode(data),
         headers: {
           "Content-Type": "application/json; charset=UTF-8",
         },
       );
       //
       if (response.statusCode == 200) {
         return "success";
       } else {
         print(response.body);
         // server error
         return "err";
       }
     } catch (SocketException) {
       // fetching error
       return "err";
     }
   }

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