CurlDelegatingHandler

This package generates curl by extending HttpClient of .NET with DelegatingHandler i.e. Custom Message Handler.

• Nuget release
• Blog post

How it works

Any requests made with HttpClient is sent through the client pipeline containing only one message handler named CurlDelegatingHandler

The curl is returned in the response header named outputCurl.

To prevent sending request to the network (with default HttpClientHandler), the header CanSend: False should be added to the request.

Currently supported HTTP verbs are as follows

• GET
• POST
• PUT
• DELETE

How it was tested

Test cases were inspired from Postman Code Generators.

Sample console application

using System.Text;
using CurlGenerator;


string url = "https://jsonplaceholder.typicode.com/posts";
string jsonPayload = @"{""title"": ""New Post"", ""body"": ""This is the body of the new post"", ""userId"": 1}";
var content = new StringContent(jsonPayload, Encoding.UTF8, "application/json");

var httpClient = new HttpClient(new CurlDelegatingHandler());
httpClient.DefaultRequestHeaders.Add(Settings.CanSend, "False");
var result = await httpClient.PostAsync(url, content);
string outputCurl = result.Headers.GetValues(Settings.OutputCurl).FirstOrDefault();
Console.WriteLine(outputCurl);

Output

curl -X POST 'https://jsonplaceholder.typicode.com/posts' -H 'Content-Type: application/json; charset=utf-8' -H 'Content-Length: 78' -d '{"title": "New Post", "body": "This is the body of the new post", "userId": 1}'

Way Forward

• Builder methods can be decoupled further
• Support more Settings like Postman does