Trouble receiving response from shipping API using C# HttpHandler

Ecom
1

I’m struggling to get a response from a shipping API in my C# project. The API works fine in Postman, but I get a null object when using the VerveLogic.HttpHandler package.

Here’s a simplified version of my code:

var client = new ApiClient("https://api.shippingservice.com/v2/getlabel/");
var requestUrl = "https://api.shippingservice.com/v2/getlabel/?user=myuser&pass=mypass&quantity=1&shiptype=prepaid";
var result = client.SendRequest<dynamic>(requestUrl, new { user = "myuser", pass = "mypass", quantity = 1, shiptype = "prepaid" });
if (result != null) {
    // Process the result
}

The API should return a shipping label number, but I’m not getting any response. I’ve double-checked the API documentation and my credentials are correct. Any ideas on what might be causing this issue or how I can troubleshoot it?

2

Hey Sophie26! I’ve run into similar roadblocks with shipping APIs before. Have you tried logging the entire request and response? That can be super helpful for spotting what’s going wrong.

Also, I’m curious - are you sure the API expects the credentials in the query string? Some APIs prefer them in headers or the request body. Maybe try moving them around and see what happens?

Oh, and sometimes these APIs can be picky about things like user agent strings or specific headers. Have you compared the headers your code is sending vs what Postman’s sending? There might be a sneaky difference there!

Let us know how it goes - I’m really interested to see what you find out! :female_detective:

3

Have you considered using the HttpClient class instead of VerveLogic.HttpHandler? It’s part of the .NET framework and offers more flexibility. Here’s a quick example:

using var client = new HttpClient();
var response = await client.GetAsync(requestUrl);
if (response.IsSuccessStatusCode)
{
    var content = await response.Content.ReadAsStringAsync();
    // Process content here
}

Also, ensure you’re sending the correct content type headers. Some APIs require ‘application/json’ or specific authentication headers. Logging the full request and response can help identify issues. If you’re still stuck, consider using a tool like Fiddler to compare your C# request with the successful Postman request.

4

hey sophie, i had similar issues w/ shipping APIs. try using HttpClient instead of VerveLogic.HttpHandler. it gives more control. Also, double-check ur auth method - some APIs need special headers or tokens. Logging the response can help pinpoint the problem. good luck!